abter steel pipe manufacturer, natural gas casing and tubing,seamless steel pipe,OCTG, http://www.abtersteel.com OCTG pipe,carbon steel pipe,seamless steel pipe ,erw pipe Wed, 22 Sep 2021 02:40:03 +0000 en-US hourly 1 https://wordpress.org/?v=4.9.8 The manufacturing process and popularization and application of thick-walled pipe http://www.abtersteel.com/news/products-news/the-manufacturing-process-and-popularization-and-application-of-thick-walled-pipe/ Wed, 22 Sep 2021 02:23:55 +0000 http://www.abtersteel.com/?p=6195 Hot rolled (Extruded seamless steel pipe): round tube billet → heating → piercing → three-roll cross rolling, continuous rolling or extrusion → stripping → sizing (or reducing) → cooling → straightening → hydraulic test (or flaw detection) →Marking→Warehousing The raw material for rolling seamless pipes is round pipe blanks. The round pipe blanks are cut by a cutting machine into a billet with a length of about 1 meter, and then sent to the furnace for heating via a conveyor belt. The billet is fed into the furnace and heated at a temperature of approximately 1200°C. The fuel is hydrogen […]

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Hot rolled
(Extruded seamless steel pipe): round tube billet → heating → piercing → three-roll cross rolling, continuous rolling or extrusion → stripping → sizing (or reducing) → cooling → straightening → hydraulic test (or flaw detection) →Marking→Warehousing
The raw material for rolling seamless pipes is round pipe blanks. The round pipe blanks are cut by a cutting machine into a billet with a length of about 1 meter, and then sent to the furnace for heating via a conveyor belt. The billet is fed into the furnace and heated at a temperature of approximately 1200°C. The fuel is hydrogen or acetylene. The temperature control in the furnace is a key issue. After the round tube is out of the furnace, it must be pierced through a pressure punching machine. Generally, the more common piercing machine is the tapered roller piercing machine. This type of piercing machine has high production efficiency, good product quality, large perforation diameter expansion, and can wear a variety of steel types. After piercing, the round tube billet is successively cross-rolled, continuous rolled or extruded by three rolls. After squeezing, take off the tube and calibrate. The sizing machine uses a tapered drill bit to rotate at a high speed into the steel blank to punch holes to form a steel pipe. The inner diameter of the steel pipe is determined by the length of the outer diameter of the drill bit of the sizing machine. After the steel pipe is sized, it enters the cooling tower and is cooled by spraying water. After the steel pipe is cooled, it will be straightened. After straightening, the steel pipe is sent to the metal flaw detector (or hydraulic test) by the conveyor belt for internal flaw detection. If there are cracks, bubbles, etc. inside the steel pipe, it will be detected. After the quality inspection of steel pipes, strict manual selection is required. After the quality inspection of the steel pipe, paint the serial number, specification, production batch number, etc. with paint. It is hoisted into the warehouse by a crane.
Cold drawn
Seamless steel pipe: round tube blank → heating → piercing → heading → annealing → pickling → oiling (copper plating) → multi-pass cold drawing (cold rolling) → billet tube → heat treatment → straightening → hydraulic test (flaw detection) →Marking→Warehousing.
Application promotion
Foreign heat treatment manufacturers attach great importance to cooling during the heat treatment process. According to the technical and process requirements of 12Cr1MoV structural alloy steel pipes, slow cooling, oil quenching, one-time gas quenching, etc. can be carried out. Rapid atmosphere circulation cooling uses high-pressure gas injection into the cooling chamber, and the computer controls the flow rate and flow rate changes to achieve the cooling rate within a specific time, so as to achieve the required cooling curve during the heat treatment process and ensure the heat treatment quality of the 12Cr1MoV structural alloy steel pipe. In the past, the quenching gas cooled by the gas quenching method is nitrogen, helium, etc. At present, the 12Cr1MoV structural alloy steel pipe is cooled very quickly with strong air injection. After quenching, there is only a very thin oxide film on the surface, which is off-white, 12Cr1MoV The color of the structural alloy steel pipe is still beautiful, and a large amount of nitrogen and inert gas are saved, which further reduces the cost of heat treatment.
The combination of vacuum low pressure carburizing and high pressure gas quenching is an advanced carburizing quenching process today. It has fast carburizing speed, excellent carbide structure, small quenching cracking and deformation, energy saving and carburizing agent raw materials, carburizing 12Cr1MoV Structural alloy steel pipes have good surface quality and are conducive to environmental protection.
Heat treatment equipment
Fan cooling, heat exchanger cooling, quenching oil tank cooling and other cooling devices all adopt oil-sealed self-cooling, which completely replaces the water-cooled circulation system, and the entire heat treatment furnace does not require any cooling water. For example, hot air circulation fan cooling: change the inlet and outlet pipes of the original water cooling jacket to oil pipes, and place a small oil tank with a diameter of 102mm close to the fan. The oil cooling system is fully enclosed. When the fan bearing heats up, the proportion of the heated oil is small. , Naturally float upwards, causing the oil to circulate naturally. In the case of small oil tank storage and natural heat dissipation, the hot oil is added to the circulation after being cooled, so as to completely replace water cooling without consuming fuel and requiring no power. The water in the plate heat exchanger of the quenching oil tank is replaced with cooling oil. The cooling oil is heated by the heat exchange of the hot oil. The change in the specific gravity of the oil causes the cooling oil to circulate itself. It can achieve the effect of full oil cooling and save a lot of cooling water.
Nitriding furnace
The German company Ipsen has applied hydrogen probes and corresponding technologies to measure and control the nitrogen potential in the nitriding furnace, so as to adjust and control the atmosphere of the nitriding furnace and realize the modernization of the nitriding furnace.
Gas radiant tube
Use natural gas for heating. Gas heating technology and equipment are very mature in Europe. Natural gas burners have a standard series, which are manufactured and supplied by professional burner factories. The inner tube of the gas radiant tube is replaced with ceramic from stainless steel to extend the service life and increase the power. Natural gas heating improves energy utilization and reduces production costs.

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The steel market soars by 600, and the rhythm changes. pay attention to heavy data http://www.abtersteel.com/news/industry-news/the-steel-market-soars-by-600-and-the-rhythm-changes-pay-attention-to-heavy-data/ Wed, 15 Sep 2021 02:27:41 +0000 http://www.abtersteel.com/?p=6192 Last week, the domestic futures market prices accelerated, especially the rapid performance of the futures market, with the highest price increase of nearly 600 yuan at one time!   Among them, under the blessing of production restriction and safety production and other favorable factors, Bijiao has repeatedly set record highs, reaching 3000 yuan and 3800 yuan, and thread and hot coil futures have broken through the previous pressure level, with the highest standing at 5700 and 5900. Yuan Pass. Only iron ore is negatively correlated, and it has fallen all the way to a low of 710 yuan in the […]

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Last week, the domestic futures market prices accelerated, especially the rapid performance of the futures market, with the highest price increase of nearly 600 yuan at one time!

 

Among them, under the blessing of production restriction and safety production and other favorable factors, Bijiao has repeatedly set record highs, reaching 3000 yuan and 3800 yuan, and thread and hot coil futures have broken through the previous pressure level, with the highest standing at 5700 and 5900. Yuan Pass. Only iron ore is negatively correlated, and it has fallen all the way to a low of 710 yuan in the past 14 months.

 

Over the weekend, continued to break through the obstacles, superimposed on multiple departments to cool down, the bifocal at the cusp of the storm took the lead to adjust, and the diving accelerated in the afternoon, and the growth of thread and hot-coil futures also retreated significantly, and the trading atmosphere in the spot market gradually turned cold.

 

As of September 10, 2021, the Lange Steel Composite Price Index reached 5884 yuan, an increase of 1.64% from last weekend, and 42.84% higher than last year; the Lange Steel Long Steel Price Index reached 5589 yuan, an increase of 2.77% from last weekend, and compared with last year. It was 42.69% higher over the same period; the Lange Steel Plate Price Index reached 6,108 yuan, up 0.8% from last weekend and 43.02% higher than the same period last year.

 

Construction Steel

 

In terms of specific spot prices, the monitoring data of the Lange Steel Cloud Business Platform shows that as of September 10, the average price of Φ25mm grade 3 rebar in the 10 major cities in China was 5433 yuan, an increase of 153 yuan over the weekend and an increase of 175 yuan over the same period last month. . As of September 10, the average price of Φ6.5mm and HPB300 high-line in the 10 major domestic cities was 5,961 yuan, an increase of 150 yuan over the weekend and an increase of 160 yuan over the same period last month.

 

The monitoring data of the Lange Steel Cloud Business Platform shows that as of September 10, the social inventory of construction steel in 29 key cities across the country reached 771,600 tons, a decrease of 153,900 tons from the previous weekend, or 1.96%, and a decrease of 3.64 from the same period last month. %, which is 17% lower than the same period last year.

 

Plank

 

Regarding the price of hot-rolled coils, the monitoring data of the Lange Steel Cloud Business Platform shows that as of September 10, the average price of 5.5mm hot-rolled coils in 10 key cities in China was 5,837 yuan, an increase of 67 yuan over the weekend and the same period last month. Up 82 yuan. In terms of inventory, as of September 10, the total inventory of hot-rolled coils in 29 key cities in China reached 2.592 million tons, a decrease of 73,300 tons from the end of last week, or 2.69%, and a decrease of 7.66% from the same period last month and higher than the same period last year. 7.2%.

 

As for the price of cold-rolled coil, as of September 10, the average price of 1.0mm cold-rolled coil in 10 key cities in China was 6,520 yuan, an increase of 20 yuan over the weekend and 28 yuan over the same period last month. In terms of inventory, as of September 10, the inventory of cold rolled coils in 24 key cities in China was 1,161,400 tons, an increase of 24,000 tons over the weekend, or 0.2%, an increase of 0.01% over the same period last month, and an increase of 10.6% over the same period last year. .

 

In terms of plate prices, as of September 10, the price of 20mm plates in 10 key cities in China was 5,713 yuan, an increase of 54 yuan over the weekend and 52 yuan over the same period last month. In terms of inventory, as of September 10, the stock of medium and heavy coils in 29 major cities in China reached 1.166 million tons, a decrease of 20,200 tons from the previous weekend, or 1.71%, and a decrease of 5.96% from the same period last month, and higher than the same period last year. 4.31%.

 

predict

 

This week is about to enter mid-September. Will the steel market continue to move up or enter the adjustment market? What are the factors worthy of attention?

 

From the perspective of supply and demand, the speed of market destocking has accelerated significantly, indicating that the market is in the process of transitioning to the peak season. According to statistics from Lange Steel Network, as of September 10, steel stocks in key domestic cities were 12.703 million tons, a decrease of 245,000 tons from last week, a weekly decrease of 1.9%. This week’s inventory was 8.91% lower than the same period last year. Among them, the construction steel inventory was 7,713,600 tons, a decrease of 153,900 tons from last week, a weekly decrease of 1.96%, and a decrease of 17% from the same period last year. Sheet stocks also fell across the board.

 

In the later stage, we need to pay attention to two continuities and one uncertainty. One is the continuity of demand. After the explosive volume of transactions this week, demand overdraft is obvious, market transactions tend to be weak, terminal and speculative demand is significantly reduced, and the market fear of high and wait-and-see psychology has begun to dominate. If the follow-up continues to be weak, it is not ruled out that there will be shocks and vomiting in the market;

 

From a general perspective, as the country’s structural adjustments to real estate are imperative, the impact of real estate on the economy will decline, and it is beginning to mention moderately advanced infrastructure construction. In addition, the National Development and Reform Commission agreed to the National Railway Group to issue 300 billion yuan of China Railway Construction Bonds, of which 130 billion yuan will be used for railway construction projects, and 170 billion yuan will be used for debt structure adjustment. The impact of the market is more important.

 

The other is the continuous issue of production reduction, strict control of the production capacity of high-energy-consuming and high-emission industries, the full presence of environmental protection groups in various regions, and the progress of the announcement of the “Implementation Plan for Carbon Peak in the Iron and Steel Industry”. The support for the market is still .

 

The uncertain factor is that the country’s tolerance for high prices is also more urgent. This week the National Development and Reform Commission once again emphasized the elimination of malicious speculation on coal prices, price hikes, hoarding and other behaviors. The DCE has adjusted its handling fees for coking coal and coke. The Coal Transportation and Marketing Association also stated that the price of coking coal cannot rise in an orderly manner, and market sentiment tends to be cautious. The game between supply and demand, reality and policy will continue in the later period.

 

From a technical point of view, one is that, except for iron ore, all are currently in the upward channel; the second is that it has reached a staged high; the third is that opportunities and risks coexist.

 

In particular, bifocals have repeatedly set historical new highs. The pressure on the upper side is very obvious. Thread and hot coil futures are roughly the same. Take the thread as an example. If 5700 is stable and there are new driving benefits, the possibility of breaking through 5800 exists. When encountering obstacles and even the reality is not as expected, the chances of turning down will increase significantly.

 

The new financial data is released. Among them, China’s social financing scale in August increased by 2.96 trillion yuan, 629.5 billion yuan less than the same period of the previous year. It is expected to be 285.714 billion yuan, and the previous value is 1.060 billion yuan; the balance of broad money (M2) at the end of August 231.23 trillion yuan, an increase of 8.2% year-on-year, is estimated to be 8.4%, and the previous value is 8.3%; the new RMB loans in August are 1.220 billion yuan, which is estimated to be 1.4 trillion yuan, and the previous value is 1083.2 billion yuan. From the data point of view, the social financial data was slightly higher than expected, and was significantly higher than the previous value of 1.9 trillion, and the growth rate of M2 and new loans were slightly lower than expected.(Reprinted in Lange Steel)

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Damage and repair of oil and gas well casing http://www.abtersteel.com/news/products-news/damage-and-repair-of-oil-and-gas-well-casing/ Wed, 08 Sep 2021 01:49:39 +0000 http://www.abtersteel.com/?p=6186 Oil casing is the lifeline to maintain the operation of oil wells. Due to different geological conditions, the downhole stress state is complex, and the combined action of tensile, compressive, bending and torsion stresses on the pipe body, which puts forward higher requirements on the quality of the casing itself. Once the casing itself is damaged for some reason, the entire well may be reduced or even scrapped.   Oil and gas wells are the fixed assets of oil companies, and oil layer casing is the most basic element of oil and gas wells. Once the oil layer casing is […]

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Oil casing is the lifeline to maintain the operation of oil wells. Due to different geological conditions, the downhole stress state is complex, and the combined action of tensile, compressive, bending and torsion stresses on the pipe body, which puts forward higher requirements on the quality of the casing itself. Once the casing itself is damaged for some reason, the entire well may be reduced or even scrapped.

 

Oil and gas wells are the fixed assets of oil companies, and oil layer casing is the most basic element of oil and gas wells. Once the oil layer casing is damaged and cannot be repaired, it means the scrapping of the oil and gas well and the loss of fixed assets. The oil layer casing is subjected to the high pressure of the oil layer and the erosion of gas, liquid and other media throughout the year, and it is also repeatedly subjected to external forces such as various workover operations and stimulation measures. The main reasons for the damage are as follows:

 

(1) The casing itself is of poor quality and low strength;

 

(2) The cementing quality is poor and the sealing is not firm;

 

(3) Corrosion effects of water, chemical agents and microorganisms;

 

(4) Geological tectonic movement and lithology around the casing;

 

(5) Damage to the casing caused by high-pressure water injection;

 

(6) The impact of sand production in oil, gas and water wells;

 

(7) Damage to casing caused by improper workover operation.

 

There are generally three types of casing damage, namely, casing diameter reduction, casing rupture, and casing breakage.

 

Due to the different casing damage location, damage degree and damage condition, some can not be repaired, some can be repaired.

 

For the repair method of casing diameter reduction, the roller shaper which gradually expands is used during repair, and the inner diameter is gradually expanded by pressurizing the drill pipe. This method is relatively simple and easy to take effect.

 

There are several methods for repairing broken casing, cracks or holes:

 

(1) Squeeze cement slurry. When the pressure of the oil layer is not high, and the rupture and leakage are not serious, it can be repaired by squeezing cement slurry. The process method is: first use a bore gauge diameter 8-10 mm smaller than the inner diameter of the casing, and then place a suspended plugging device (the tool name is called a bridge plug) at the appropriate position of the breach to temporarily seal off the wellbore below the breach , And then inject a certain amount of cement slurry above the bridge plug to make it solidify into a cement plug. After the cement plug is solidified, drill the cement plug in the casing, and test pressure to check the quality of the fracture of the cement seal. The seal is to be confirmed After the quality is qualified, the suspended plug (bridge plug) is drilled and the sand is flushed to the bottom of the well. The casing repaired by this method can generally withstand a pressure of 40-80 MPa, but a packer should be used to protect the well during high-pressure construction to prevent this section from being subjected to high pressure.

 

(2) Replace the casing. When the rupture position is in the upper part of the oil well and the casing above the breach can be taken out by the reverse buckle method, the reverse buckle method can be used to lift up all the casing above the accident section, reinsert a new casing, and fasten it tightly. The advantage of this method is to ensure the consistency of the inner diameter of the casing, and the downhole tools can be passed smoothly after operation; the disadvantage is that the tightness of the casing thread of the downhole butt is not as tight as on the wellhead.

 

(3) Subsidy Law. The supplementary rule is to paste a thin-walled pipe on the inner wall of the broken casing to achieve the purpose of repair. The process principle is: a special high-pressure resistant rubber tube is sleeved with a corrugated tube (thin-walled tube) down to the damaged position of the casing in the well, the pressure is held to expand the rubber tube, and the corrugated tube is expanded at the same time to make the corrugated tube tight. Stick the inner wall of the damaged part of the casing, and the casing and the bellows are bonded together by the adhesive. After the adhesive is cured, move the drill tool and take out the high-pressure rubber tube. This subsidy process is simple and safe to operate.

 

Wells with broken casing can be repaired separately in three cases. The first is broken but there is no dislocation; the second is broken but the dislocation is not serious; the third is broken and the dislocation is serious, and the lower casing can’t even be found.

 

In order to obtain information such as the displacement, the depth of the fault, the relative distance between the upper and lower fractures and whether the fracture is deformed after the casing is broken, methods such as printing and instrument testing can be used to clarify the situation.

 

For the broken casing without misalignment, it can be repaired by grout injection method; for the broken casing but the misalignment is not serious, use the replacement casing method to repair if the casing replacement is allowed; if the casing replacement conditions are not available, it can be repaired underneath. The repair method is to mill off a section of the broken casing, and clamp and pull the upper and lower casings with a repair tool in the middle to ensure the normal production of the oil well.

 

For wells that are seriously misaligned after fracture and can not find the lower casing, the sidetracking method can be used. That is, the wellbore at the fracture is cemented to death, a small drill pipe is lowered from the upper casing to re-drill a borehole, and a casing smaller than the original casing is inserted to cement the well.

 

The mechanics and environmental behavior of oil pipes have an important influence on the adoption of advanced technology and production and efficiency in the oil industry; oil pipes have a huge loss of failure, and their safety, reliability and service life are of great importance to the oil industry.

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Steel market “Golden Nine” peak season is approaching, the market bottoming out and rebounding soon? http://www.abtersteel.com/news/industry-news/steel-market-golden-nine-peak-season-is-approaching-the-market-bottoming-out-and-rebounding-soon/ Mon, 30 Aug 2021 01:26:24 +0000 http://www.abtersteel.com/?p=6183 The recent analysis of the monetary and credit situation by relevant financial institutions believes that domestic economic recovery still needs to maintain stable credit growth, moderate monetary growth should support high-quality economic development, help small and medium-sized enterprises and difficult industries continue to recover, and serve the revitalization of rural areas. Policies are combined to provide financial support to financial institutions by using monetary policy tools such as re-lending and rediscounting and deposit reserve ratio. After the implementation of the overall RRR cut in July, the central bank’s recent meetings have successively stated that the comprehensive use of a variety […]

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The recent analysis of the monetary and credit situation by relevant financial institutions believes that domestic economic recovery still needs to maintain stable credit growth, moderate monetary growth should support high-quality economic development, help small and medium-sized enterprises and difficult industries continue to recover, and serve the revitalization of rural areas. Policies are combined to provide financial support to financial institutions by using monetary policy tools such as re-lending and rediscounting and deposit reserve ratio.

After the implementation of the overall RRR cut in July, the central bank’s recent meetings have successively stated that the comprehensive use of a variety of monetary policy tools will guide the reasonable growth of loans. With the weakening of the economic recovery momentum and the emergence of pressure to stabilize growth, the industry generally believes that the signal of stable and loose monetary policy is more obvious, and there is a greater possibility that the RRR will be lowered again in the later period.

Against this background, can the tight capital situation in the steel circulation market be improved? The traditional “Golden Nine” peak season in the steel market is coming soon, will it bring a wave of strong market?

The price of ore stops falling and stabilizes, the market may rebound

As an upstream sector, recent data on the iron ore market is worth noting. Relevant data show that from August 23 to August 27, the price index of imported iron ore stopped falling and stabilized.

According to the monitoring data of the Lange Steel Cloud Business Platform, as of August 27, 58% of the Australian powder index was US$121/ton, which was an increase of US$3/ton from last week; 61.5% of the Australian powder index was US$138/ton, which was an increase from last week. US$4/ton; 62% Australian block index is US$178/ton, down US$2/ton from last week.

During the “14th Five-Year Plan” period, the iron and steel industry must enhance its ability to guarantee resources. Recently, the Ministry of Natural Resources mentioned in its reply to a proposal on strengthening iron ore exploration and improving resource security that it will further strengthen basic geological work, increase the transfer of mining rights, promote market entities to increase investment in prospecting, and promote the revision of the Mineral Resources Law. , Improve the mining rights, reserves management and equity gold systems; innovate the prospecting incentive mechanism, explore incentives for units that provide block suggestions and successfully sell blocks; deepen the reform of geological prospecting units, and play the role of geological prospecting units in geological prospecting .

In terms of market conditions, iron ore prices have continued to fall since July, and the 61.5% Australian powder index price has fallen by more than 30%. However, the pace of steel mills’ production reduction has slowed recently, and the demand for iron ore has temporarily stabilized. This week, the price of ore stopped falling and stabilized. .

Lange Steel Research Center Wang Jing believes that under the background of reducing crude steel output, the supply and demand pattern of iron ore is still weak, and the price center will continue to move downward. However, in the short term, after substantial adjustments, the market risk brought about by the expected production reduction will be fully released. And the iron ore inventory of steel mills is at a relatively low level. With the arrival of the peak season, there will be a certain replenishment demand, which will support the price, and the market may rebound in shock.

Monetary policy will boost infrastructure

Wang Jing believes that since the outbreak of the epidemic, domestic monetary policy has maintained independence and there has been no large-scale easing. In recent months, the growth rate of major financial data indicators has fallen, and liquidity has been weak. Weak, on the one hand, are constraints on infrastructure and restrictions on real estate financing. Since funds cannot be injected into the real estate and infrastructure fields, and are transmitted and circulated through the purchase and sale chain, the steel market feels that funds are tight. Although the cash flow of individual real estate companies is extremely tight, it is unlikely that the policy will be relaxed in the face of real estate regulation. The non-performing loans rate of some banks in the real estate industry has risen. Banks will be more cautious in lending to real estate companies, which means that macro-liquidity is still difficult. Inject into the real estate sector.

But the current situation has changed. The Ministry of Finance recently released a report on the implementation of China’s fiscal policy in the first half of the year, stating that it will moderately speed up the issuance of special local government bonds, make good use of local government special bond funds, guide local governments to strengthen project reserves, and promote the formation of physical workloads at the end of this year and early next year. Support the expansion of effective investment, guarantee the capital demand for key project construction, optimize government investment arrangements, and enhance the stamina for investment growth.

She predicts that monetary policy will be coordinated with fiscal policy, through methods such as RRR cuts, and appropriate liquidity to support the acceleration of the issuance of local government special bonds, and the infrastructure sector is expected to receive more capital injections.

“Under the background of the slowdown in economic recovery, the monetary policy is stable and loose, supporting the real economy, maintaining stable liquidity, restricting real estate, and boosting infrastructure, while more funds flow to small, medium and micro enterprises in the middle and lower reaches of the industry. , As a whole, it is conducive to the stability of steel demand and the improvement of funding, which is good for the steel market.” Wang Jing said.

She also talked about the need to pay attention to the annual meeting of global central banks currently being held. “As a weather vane for the policy turning point of major central banks in the world, we need to pay attention to the policy signals they release and the expected impact.”

Can “Golden Nine” Bottom Up?

According to Ge Xin from the Lange Steel Research Center, in the 35th week of 2021 (2021.8.23-8.27), the Lange Steel’s national absolute price index is 5,711 yuan, an increase of 0.30% from last week and an increase of 39.72% from the same period last year. Among them, the absolute price index of Lange Steel Long Products was 5351 yuan, an increase of 0.47% from last week, and an increase of 37.55% from the same period last year; the absolute price index of Lange Steel Profiles was 5,670 yuan, an increase of 0.58% from last week, and an increase from the same period last year. 44.91%; The Lange Steel Plate Absolute Price Index was 5,975 yuan, an increase of 0.15% from last week, and an increase of 40.96% from the same period last year; the Lange Steel Pipe Absolute Price Index was 6,211 yuan, an increase of 0.08% from last week, and an increase from the same period last year. 39.30%.

According to the monitoring data of the Lange Steel Cloud Business Platform, in the 35th week of 2021, the price changes of 17 categories and 43 specifications (variety) of steel raw materials and steel products in some regions in China are as follows: The market prices of major steel products fluctuate and consolidate. Compared with the week, the rising varieties have increased, the flat varieties have increased, and the falling varieties have decreased significantly. Among them, 17 varieties rose, 14 more than last week; 16 varieties remained the same, 12 more than last week; 10 varieties fell, 26 less than last week. The domestic steel raw material market fluctuated and rose, iron ore prices rose by 10-25 yuan, coke prices rose by 240 yuan, scrap steel prices fluctuated slightly, and billet prices rose by 70 yuan.

Ge Xin believes that the domestic steel market is approaching the traditional “Golden Nine” peak season, but the downstream demand recovery is not obvious. The market transactions are up and down, and because the profits of the steel mills have recovered in the early stage, the steel mills are also enthusiastic about production. Increased, which prompted a rebound in the output of large and medium-sized steel companies in mid-August.

He said that since the second half of the year, the downstream demand situation has not been as expected. The real estate industry has been suppressed by policies but still remains resilient, but the infrastructure industry is far from reaching expectations. This shows whether the market demand in the peak season of “Golden 9” can recover as expected. There is still uncertainty about the arrival. “However, the Ministry of Finance recently stated that it will speed up the budgetary expenditures in the second half of the year and the issuance of local government bonds, which has brought a certain boost to the traditional peak season of demand. In the short term, the domestic steel market will show a situation of turbulence and bottoming up.”

According to data from the weekly price prediction model of the Lange Steel Cloud Business Platform, next week (2021.8.30-9.3), the domestic steel market prices will fluctuate upwards, the long products market prices will rise slightly, the profile market prices will rise steadily, and the plate market prices Steady and strong, the market price of pipes will fluctuate and rise.

In the 36th week of 2021 (8.30-9.3), the Lange Steel National Absolute Price Index is expected to be 5,725 yuan, an increase of 14 yuan; of which, the Lange Steel Long Products Absolute Price Index is expected to remain at 5398 yuan, an increase of 47. Lange steel profile absolute price index is expected to be 5699 yuan, an increase of 20 yuan; Lange steel sheet absolute price index is expected to be 5979 yuan, an increase of 4 yuan; Lange steel pipe absolute price index is expected to be 6,226 yuan, an increase of 15 yuan. (China Finance Network)

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Technical requirements for hot-dip galvanized steel tubes http://www.abtersteel.com/news/products-news/technical-requirements-for-hot-dip-galvanized-steel-tubes/ Wed, 25 Aug 2021 00:53:37 +0000 http://www.abtersteel.com/?p=6174 Hot-dip galvanizing is to pickle the steel pipe first. In order to remove the iron oxide on the surface of the steel pipe, after the pickling, it is cleaned in a tank of ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then sent to In the hot dip plating tank.Hot dip galvanizing has the advantages of uniform coating, strong adhesion, long service life and strong corrosion resistance. Brand and chemical composition The grade and chemical composition of the steel for galvanized steel pipes should comply with the grade and […]

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Hot-dip galvanizing is to pickle the steel pipe first. In order to remove the iron oxide on the surface of the steel pipe, after the pickling, it is cleaned in a tank of ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then sent to In the hot dip plating tank.Hot dip galvanizing has the advantages of uniform coating, strong adhesion, long service life and strong corrosion resistance.

  1. Brand and chemical composition

The grade and chemical composition of the steel for galvanized steel pipes should comply with the grade and chemical composition of the steel for black pipes as specified in GB 3092.

  1. Manufacturing method

The manufacturing method of the black pipe (furnace welding or electric welding) is selected by the manufacturer. Hot-dip galvanizing is used for galvanizing.

  1. Thread and pipe joints

3.1 For galvanized steel pipes delivered with threads, the threads should be machined after galvanizing. The thread should comply with YB 822 regulations.

3.2 Steel pipe joints should comply with YB 238; malleable cast iron pipe joints should comply with YB 230.

  1. Mechanical properties The mechanical properties of steel pipes before galvanizing should meet the requirements of GB 3092.
  2. Uniformity of the galvanized layerGalvanized steel pipe should be tested for the uniformity of the galvanized layer. The steel pipe sample shall not become red (copper-plated) after being immersed in copper sulfate solution for 5 consecutive times.
  3. Cold bend test The galvanized steel pipe with a nominal diameter of not more than 50mm should be subjected to a cold bend test. The bending angle is 90°, and the bending radius is 8 times the outer diameter. There is no filler during the test, and the weld of the sample should be placed on the outside or upper part of the bending direction. After the test, there should be no cracks and peeling of the zinc layer on the sample.
  4. Water pressure test The water pressure test should be carried out in the clarinet. Eddy current flaw detection can also be used instead of the water pressure test. The test pressure or the size of the comparison sample for eddy current testing shall meet the requirements of GB 3092.

The mechanical properties of steel is an important index to ensure the final use performance (mechanical properties) of the steel, and it depends on the chemical composition of the steel and the heat treatment system. In the steel pipe standard, according to different application requirements, the tensile properties (tensile strength, yield strength or yield point, elongation), hardness, toughness indicators, and high and low temperature properties required by users are specified.

①Tensile strength (σb)

In the tensile process, the maximum force (Fb) that the sample bears when it breaks is the stress (σ) obtained from the original cross-sectional area (So) of the sample, which is called the tensile strength (σb), and the unit is N/mm2 (MPa). It represents the maximum ability of a metal material to resist damage under tensile force. The calculation formula is:

In the formula: Fb-the maximum force that the sample bears when it is broken, N (Newton); So-the original cross-sectional area of ​​the sample, mm2.

②Yield point (σs)

For a metal material with a yield phenomenon, the stress at which the sample can continue to elong without increasing the force during the stretching process (maintaining constant) is called the yield point. If the force drops, the upper and lower yield points should be distinguished. The unit of yield point is N/mm2 (MPa).

Upper yield point (σsu): the maximum stress before the specimen yields and the force drops for the first time; Lower yield point (σsl): the minimum stress in the yield stage when the initial transient effect is not taken into account.

The calculation formula of the yield point is:

Where: Fs–yield force (constant) during the tensile process of the specimen, N (Newton) So–the original cross-sectional area of ​​the specimen, mm2.

③Elongation after breaking (σ)

In the tensile test, the percentage of the length of the gauge length increased after the sample is broken to the original gauge length is called the elongation. Expressed by σ, the unit is %. The calculation formula is:

In the formula: L1-the gauge length of the specimen after breaking, in mm; L0-the original gauge length of the specimen, in mm.

④Reduction of area (ψ)

In the tensile test, the percentage of the maximum reduction of the cross-sectional area at the reduced diameter of the sample after the sample is broken to the original cross-sectional area is called the reduction of area. Expressed in ψ, the unit is %. The calculation formula is as follows:

In the formula: S0-the original cross-sectional area of ​​the sample, mm2; S1-the minimum cross-sectional area at the reduced diameter of the sample after it is broken, mm2.

⑤ Hardness index

The ability of metal materials to resist the indentation of hard objects on the surface is called hardness. According to the different test methods and scope of application, the hardness can be divided into Brinell hardness, Rockwell hardness, Vickers hardness, Shore hardness, micro hardness and high temperature hardness. There are three commonly used pipes: Brinell, Rockwell, and Vickers hardness.

  1. Brinell hardness (HB)

Use a steel ball or cemented carbide ball of a certain diameter to press into the surface of the sample with the specified test force (F), remove the test force after the specified holding time, and measure the diameter of the indentation on the surface of the sample. (L) The Brinell hardness value is the quotient obtained by dividing the test force by the spherical surface area of ​​the indentation. Expressed in HBS (steel ball), the unit is N/mm2 (MPa).

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Lange Research: Economic data has fallen in an all-round way, steel demand for expansion is weak http://www.abtersteel.com/news/industry-news/lange-research-economic-data-has-fallen-in-an-all-round-way-steel-demand-for-expansion-is-weak/ Tue, 17 Aug 2021 01:33:28 +0000 http://www.abtersteel.com/?p=6163 According to data released by the National Bureau of Statistics today, in July, affected by multiple factors, major macro indicators have generally fallen, external demand has weakened, investment growth has declined slightly, and consumption recovery has been disturbed. Major economic indicators fell across the board The momentum for the restoration of fixed asset investment has weakened, and the two-year average growth rate has fallen for the first time. From January to July, the national investment in fixed assets (excluding rural households) was 3,053.3 billion yuan, an increase of 10.3% year-on-year, and an average growth rate of 4.3% in two years. […]

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According to data released by the National Bureau of Statistics today, in July, affected by multiple factors, major macro indicators have generally fallen, external demand has weakened, investment growth has declined slightly, and consumption recovery has been disturbed.

Major economic indicators fell across the board

The momentum for the restoration of fixed asset investment has weakened, and the two-year average growth rate has fallen for the first time. From January to July, the national investment in fixed assets (excluding rural households) was 3,053.3 billion yuan, an increase of 10.3% year-on-year, and an average growth rate of 4.3% in two years. The average growth rate was 0.1 percentage point lower than that in the first six months. In terms of different areas, infrastructure investment increased by 4.6% year-on-year, and the two-year average growth rate was 0.9%, which was 1.5 percentage points lower than that from January to June; manufacturing investment increased by 17.3% year-on-year, and the two-year average growth rate was 3.1%, which was faster than January-June. 1.1 percentage points, the improvement narrowed compared with the previous period; real estate development investment increased by 12.7%, an average increase of 8.0% in two years, 0.2 percentage points lower than that in the first six months.

The epidemic has repeatedly suppressed consumption, and recovery has slowed again. From January to July, the total retail sales of consumer goods was 246829 trillion yuan, a year-on-year increase of 20.7%, and an average growth of 4.3% over the two years. In July, the total retail sales of consumer goods increased by 8.5% year-on-year, and the two-year average growth rate was 3.6%, down 1.3 percentage points from June. In the retail sales of goods in the month, the retail sales of automobiles and home appliances decreased by 1.8% year-on-year and increased by 8.2% respectively.

External demand has weakened, and export growth has dropped significantly. From January to July, the total value of national exports (in US dollars) increased by 35.2% year-on-year, of which July increased by 0.4% month-on-month and 19.3% year-on-year, down 12.9 percentage points from the previous month.

Affected by the fall in demand, lack of coal and electricity, and limited production of steel, industrial production has slowed down significantly. In July, the value added of the industrial enterprises above designated size increased by 6.4% year-on-year in real terms, and the two-year average growth rate was 5.6%, which was 0.9 percentage points lower than that in June. Among them, the added value of the manufacturing industry increased by 6.2% year-on-year, which was a significant drop from June. The performance of main steel products was differentiated. The output of industrial robots increased relatively rapidly, and the output of automobiles and generator sets decreased significantly year-on-year.

Economic downturn pressure appears

In July, the growth rate of real estate investment slowed down, and infrastructure investment slowed down sharply. Only manufacturing investment continued to improve. Consumption was affected by repeated epidemics and recovered less than expected. External demand remained resilient, but the growth rate dropped significantly.

On the whole, the momentum of economic recovery has further weakened, with the impact of temporary unfavorable factors such as epidemics and heavy rains in some regions. However, the economic data has fallen more than expected, and there are also endogenous structural downward pressures that drive the real estate recovery after the epidemic. The two major momentums of investment and exports are declining, manufacturing investment is difficult to hedge, infrastructure investment is sluggish, consumption is recovering slowly, and the window period with less pressure to stabilize growth has passed.

Policies to stabilize growth may be strengthened

The Politburo meeting on July 30 emphasized that it is necessary to do a good job in the cross-cycle adjustment of macroeconomic policies, and make overall plans for the convergence of macroeconomic policies this year and the next. On the basis of maintaining continuity and stability, the policy will take into account both the short-term and the medium- to long-term. When the economy is facing greater downward pressure, the policy may tend to be loose to underpin the economy, while leaving room for next year. In the long run, it will continue to promote economic transformation, support technological innovation, and cultivate new growth drivers such as new energy and digital economy.

Monetary policy is expected to be stable and loose, to maintain reasonable and sufficient liquidity, and commodity prices are still high. The PPI and CPI scissors gap widened in July, and the RRR will be cut again in the fourth quarter to ease the operating pressure of small and medium-sized enterprises in the middle and lower reaches of the industry. Fiscal policy is used to stabilize growth, grasp the progress of local government bond issuance, and accelerate the construction of major engineering projects.

There is room for repairing infrastructure and consumption

In the later stage, the supply of overseas economies has recovered, and the demand for goods has gradually slowed down. The new export order index of my country’s manufacturing industry has fallen for four consecutive months, and has been in a contraction range for three consecutive months. It is necessary to pay attention to the impact of export changes on the production side.

In terms of domestic demand, the completion of real estate has maintained a large scale, the leading indicators of Sino-Singaporean construction continued to weaken, and the sales of commercial housing have significantly cooled. Under the background of continuous deepening of policy control, investment will be under pressure; Preventing local government debt risks and infrastructure investment stimulating bulk commodity prices. Later, the economy will face downward pressure. The issuance of special bonds may accelerate at the end of the year, which will promote a moderate rebound in infrastructure investment, but its supporting effect on the economy may be relatively limited; manufacturing investment will continue to recover However, due to weaker domestic and foreign demand, the cost pressure of enterprises is still great, and the upward trend may be restricted to some extent.

The policy taps the potential of the domestic market, and consumption will further recover. Due to the repeated and frequent spread of the epidemic, it may be difficult to return to normal levels within the year.

The expansion of demand for steel in the peak season is weak

The construction industry is shifting from the off-season to the peak season, and steel demand will expand seasonally. However, infrastructure investment has fallen more than expected, and new real estate starts continue to weaken. The expansion momentum of steel demand in the construction industry in the peak season is weak. Due to the decline in external demand and sluggish domestic demand, the growth rate of manufacturing production has declined, and the expansion of steel demand is not strong. The industry continues to differentiate. The steel demand for construction machinery and other industries in the upstream of the construction industry may continue to weaken, benefiting from industrial upgrading of high-tech manufacturing Industrial steel demand is expected to remain strong.

After the epidemic, the “unusual” growth of steel consumption is unsustainable. As economic growth returns to normal and faces downward pressure again, it is necessary to pay attention to the risk of unexpected contraction of steel demand. (Reproduced from Lange Steel Research Center)

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The difference between hot rolled seamless pipe and cold drawn seamless http://www.abtersteel.com/news/products-news/the-difference-between-hot-rolled-seamless-pipe-and-cold-drawn-seamless/ Tue, 10 Aug 2021 01:58:49 +0000 http://www.abtersteel.com/?p=6155 Both hot rolling and cold rolling are processes for forming section steel or steel plate, and they have a great influence on the structure and performance of steel. The rolling of steel is mainly hot rolling, and cold rolling is only used to produce small section steel and sheet. 1. Hot rolled Advantages: It can destroy the casting structure of the steel ingot, refine the grain of the steel, and eliminate the defects of the microstructure, so that the steel structure is dense and the mechanical properties are improved. This improvement is mainly reflected in the rolling direction, so that the […]

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Both hot rolling and cold rolling are processes for forming section steel or steel plate, and they have a great influence on the structure and performance of steel. The rolling of steel is mainly hot rolling, and cold rolling is only used to produce small section steel and sheet.

1. Hot rolled

Advantages: It can destroy the casting structure of the steel ingot, refine the grain of the steel, and eliminate the defects of the microstructure, so that the steel structure is dense and the mechanical properties are improved. This improvement is mainly reflected in the rolling direction, so that the steel is no longer isotropic to a certain extent; bubbles, cracks and looseness formed during casting can also be welded under high temperature and pressure.

Disadvantages: 1. After hot rolling, the non-metallic inclusions (mainly sulfides and oxides, as well as silicates) inside the steel are pressed into thin sheets, and delamination (interlayer) occurs. Delamination greatly deteriorates the tensile properties of the steel in the thickness direction, and it is possible that interlayer tearing may occur when the weld shrinks. The local strain induced by weld shrinkage often reaches several times the yield point strain, which is much larger than the strain caused by the load.

2. Residual stress caused by uneven cooling. Residual stress is the internal self-balanced stress without external force. Hot-rolled steel sections of various cross-sections have such residual stresses. Generally, the larger the section size of the steel section, the larger the residual stress. Although the residual stress is self-balanced, it still has a certain influence on the performance of the steel member under the action of external force. For example, it may have adverse effects on deformation, stability, fatigue resistance, etc.

Two, cold rolling

It refers to the processing of steel plates or steel strips into various types of steel through cold drawing, cold bending, cold drawing and other cold processing at room temperature.

Advantages: fast forming speed, high output, and does not damage the coating, can be made into a variety of cross-sectional forms to meet the needs of the use conditions; cold rolling can cause large plastic deformation of the steel, thereby improving the yield of the steel point.

Disadvantages: 1, although the molding process has not been hot plastic compression, but still residual stress within the cross-section, the overall and local buckling resistance of the steel will inevitably produced Health Effects;

2. The cold-rolled steel section is generally an open section, which makes the free torsional stiffness of the section lower. When prone to bending torsional, bending and torsion prone to buckling under compression , torsional performance than the difference;

3. The wall thickness of cold-rolled steel is small, and there is no thickening at the corners where the plates are joined, and the ability to withstand local concentrated loads is weak.

Three, the main difference between hot rolling and cold rolling

1. Cold-rolled formed steel allows local buckling of the section, so that the bearing capacity of the bar after buckling can be fully utilized; while hot-rolled steel does not allow local buckling of the section.

2. Hot-rolled steel and cold-rolled steel have different causes of residual stress, so the distribution on the cross-section is also very different. The residual stress distribution on the cross-section of cold-formed thin-walled steel is curved, while the residual stress distribution on the cross-section of hot-rolled or welded steel is thin-film.

3. The free torsional stiffness of hot-rolled steel is higher than that of cold-rolled steel, so the torsion resistance of hot-rolled steel is better than that of cold-rolled steel.

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Transformation, low-carbon green development, my country’s steel industry starts a new journey http://www.abtersteel.com/news/industry-news/transformation-low-carbon-green-development-my-countrys-steel-industry-starts-a-new-journey/ Tue, 03 Aug 2021 01:29:09 +0000 http://www.abtersteel.com/?p=6146 This year is the first year of the “14th Five-Year Plan”. Hot issues such as carbon peaking, carbon neutrality, decapacity “looking back”, capacity replacement, output reduction, and resource protection are of great concern to the entire industry. the steel industry was operating well in the first half of the year. The production and sales of the company were booming, the efficiency was improved, green development, intelligent manufacturing, technological innovation, etc. New progress has been made, providing important support for actively meeting the growth of downstream industry demand and promoting the national economy to achieve a good start to the “14th […]

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This year is the first year of the “14th Five-Year Plan”. Hot issues such as carbon peaking, carbon neutrality, decapacity “looking back”, capacity replacement, output reduction, and resource protection are of great concern to the entire industry. the steel industry was operating well in the first half of the year. The production and sales of the company were booming, the efficiency was improved, green development, intelligent manufacturing, technological innovation, etc. New progress has been made, providing important support for actively meeting the growth of downstream industry demand and promoting the national economy to achieve a good start to the “14th Five-Year Plan”.

According to data from the China Iron and Steel Association, the steel industry in the first half of the year responded to the strong growth in steel demand, and the overall supply and demand were relatively balanced. The national pig iron, crude steel and steel output were 456 million tons, 563 million tons and 698 million tons, respectively, an increase of 4.0% year-on-year. 11.8% and 13.9%; the apparent consumption of crude steel is expected to be equivalent to 537 million tons, a year-on-year increase of 10.2%. With the changes in the situation of overseas epidemic prevention and control and the recovery of international market demand, the export volume of steel products has increased significantly. According to customs statistics, my country exported 37.38 million tons of steel products in the first half of the year, a year-on-year increase of 30.2%.

The development of China’s iron and steel industry has five major characteristics that support the rapid development of the country’s economy, is a typical technology-intensive industry, makes the world a better place, is the most globally competitive industry in China, and will lead the development of the world’s iron and steel industry for a long time. So far, China’s iron and steel industry Already have a good scale, good prices, good products, good brands, good services, “5G” competitiveness, implement the most stringent environmental emission standards in the world, are leading the green revolution of world steel, and are striving to build a global steel industry low Demonstration of carbon development will evolve to a low-carbon stage in a high-quality period.

standing at the new historical starting point of the “14th Five-Year Plan”, under the background of implementing new development concepts and building a new development pattern, as the country’s economy and society enters a new stage of high-quality development, my country’s steel industry has embarked on a new journey. Under the leadership of low-carbon, digital drive, technological revolution, and green collaboration will be the three major trends to form a new balance of supply and demand, promote new technological progress, create a new industrial pattern, build a safe supply chain, and build a prosperous ecosystem .

In order to promote the transformation and upgrading and high-quality development of the steel industry, with the approval of the State Council, the Tariff Commission of the State Council issued an announcement on July 29 that from August 1 this year, the export tariffs of ferrochrome and high-purity pig iron will be appropriately increased, and they will be implemented after adjustments. 40% and 20% export tax rates. In addition, according to a joint announcement issued by the Ministry of Finance and the State Administration of Taxation, starting from August 1, 2021, my country will also cancel export tax rebates for 23 steel products including rails. This is the second time my country has adjusted steel tariffs since this year. In the first adjustment of tariffs in May, the export tax rebates of 23 tax numbers covering major high value-added products were retained, and this time they were all cancelled.

Recently, many provinces in China have announced the production of crude steel. If the country’s crude steel production does not increase year-on-year this year, the output will fall more in the second half of the year. The scope of the cancellation of export tax rebates will be expanded, which will weaken the price competition of related steel products exports. Increasing the export tariffs of ferrochrome and high-purity pig iron will affect the export orders of relevant companies. The policy purpose is to give priority to meeting domestic demand and help improve the capacity of domestic steel resources.

The overall overseas steel market has shown signs of inflection. The expansion of steel demand has slowed down, the gap between supply and demand in the market has narrowed, and the upward momentum of prices is insufficient. With the adjustment of overseas markets and the rebound of the domestic market, the price advantage of my country’s steel exports has gradually lost, and export orders have fallen. At the same time, the scope of the cancellation of export tax rebates has expanded, which will further restrain steel exports.

Reducing crude steel production capacity is an important measure to implement my country’s carbon peak and carbon neutral goals. At the aforementioned meeting of the China Iron and Steel Industry Association, the relevant person in charge of the National Development and Reform Commission stated that the National Development and Reform Commission and other departments organized 9 inspection teams to carry out on-site inspections in 29 provinces, autonomous regions and municipalities. The relevant local enterprises will be asked for the problems found in the inspections. Seriously rectify and reform in accordance with laws and regulations, and severely deal with serious problems that are not in place.

At present, the global industrial layout is undergoing major adjustment, and the risk of iron ore resource protection is increasing.The traditional steel market has entered a stable period, steel prices rise without the long-term support of fundamental factors;There are strong constraints on resource, energy and environmental protection, and the task of carbon peak and carbon neutrality is arduous.New challenges to the steel industry.

 

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API screwed steel pipe advantages and disadvantages http://www.abtersteel.com/news/products-news/api-screwed-steel-pipe-advantages-and-disadvantages/ Wed, 28 Jul 2021 01:48:24 +0000 http://www.abtersteel.com/?p=6135 The advantages of API standard threads are: 1) Easy to process, general precision, easy to process and connect the related sub on the field, low cost.2) The connection under general operating conditions is easy to repair and handle on site. 3) When used with high quality sealing grease, the fluid sealing condition can reach 69MPa and 1490 C.4) Can be used repeatedly on the buckle. Its disadvantages are: 1) High pressure and gas cannot meet the sealing requirements. 2) The connection strength of API thread is only 80% of the tensile strength of pipe body. 3) In the environment with […]

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The advantages of API standard threads are:

1) Easy to process, general precision, easy to process and connect the related sub on the field, low cost.2) The connection under general operating conditions is easy to repair and handle on site.

3) When used with high quality sealing grease, the fluid sealing condition can reach 69MPa and 1490 C.4) Can be used repeatedly on the buckle.

Its disadvantages are:

1) High pressure and gas cannot meet the sealing requirements.

2) The connection strength of API thread is only 80% of the tensile strength of pipe body.

3) In the environment with corrosive fluid, because the “interference value” of API collar is too large, excessive circumferential stress is easy to produce hydrogen embrittleness stress failure or strain crack of API collar

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Henan heavy rain steel shipments affected http://www.abtersteel.com/news/industry-news/henan-heavy-rain-steel-shipments-affected/ Thu, 22 Jul 2021 02:49:53 +0000 http://www.abtersteel.com/?p=6131 Rain, rain, rain…In recent days, the torrential rain in Henan province has been increasing, zhengzhou just three days, within an hour almost the whole year rainfall, the maximum rainfall reached 100 West Lake water, roads, subway flooded, mountain floods, mudslides occurred from time to time, the road traffic was interrupted.Steel mills affected by the flood is more serious, some steel mills have been completely shut down.While some of the smaller Highland mills that were hit by the disaster continued to operate normally, production of finished materials, such as iron ore and coke, was also affected because of road traffic jams […]

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Rain, rain, rain…In recent days, the torrential rain in Henan province has been increasing, zhengzhou just three days, within an hour almost the whole year rainfall, the maximum rainfall reached 100 West Lake water, roads, subway flooded, mountain floods, mudslides occurred from time to time, the road traffic was interrupted.Steel mills affected by the flood is more serious, some steel mills have been completely shut down.While some of the smaller Highland mills that were hit by the disaster continued to operate normally, production of finished materials, such as iron ore and coke, was also affected because of road traffic jams and transportation difficulties.According to the key iron and steel enterprises in Henan monitored by cSA, in 2020, anyang iron and steel production of 11.2 million tons, Henan Fengbao special steel 1.91 million tons, Henan Jiyuan iron and steel 4.34 million tons, Nanyang Hanye special steel 2.72 million tons.Therefore, according to the calculation, anyang Steel day crude steel 30,000 tons;Henan Fengbao special steel 5000 tons;Jiyuan steel daily crude steel 11,000 tons;Nanyang Hanye special steel 7000 tons.Therefore, the daily direct or indirect impact of steel resources more than 53,000 tons.Flooding in Henan province will weaken production and demand in regional markets.Therefore, regional markets may be weak in the short term, but after a period of relief, steel production will resume as usual.After the start of post-disaster reconstruction and water conservancy construction, it will drive the demand recovery and volume increase in Henan region, thus stimulating the regional market transaction and price return to active.

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