September 22, 2021

The manufacturing process and popularization and application of thick-walled pipe

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 […]
September 15, 2021

The steel market soars by 600, and the rhythm changes. pay attention to heavy data

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 […]
September 8, 2021

Damage and repair of oil and gas well casing

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 […]
August 30, 2021

Steel market “Golden Nine” peak season is approaching, the market bottoming out and rebounding soon?

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 […]
August 25, 2021

Technical requirements for hot-dip galvanized steel tubes

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 […]
August 17, 2021

Lange Research: Economic data has fallen in an all-round way, steel demand for expansion is weak

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. […]
August 10, 2021

The difference between hot rolled seamless pipe and cold drawn seamless

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 […]
August 3, 2021

Transformation, low-carbon green development, my country’s steel industry starts a new journey

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 […]
July 28, 2021

API screwed steel pipe advantages and disadvantages

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 […]
July 22, 2021

Henan heavy rain steel shipments affected

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 […]