October 15, 2021

General term for steel pipe

General term   ①Delivery status    refers to the final plastic deformation or final heat treatment state of the delivered product. Generally, those delivered without heat treatment are called hot-rolled or cold-drawn (rolled) state or manufacturing state; those delivered after heat treatment are called heat-treated state, or normalized (normalized), quenched and tempered, solution, annealed according to the type of heat treatment state. When ordering, the delivery status must be indicated in the contract.   ②Delivery according to actual weight or theoretical weight    Actual weight-when delivered, the weight of the product is delivered according to the weighed (weighed) weight;   Theoretical weight-at the […]
October 8, 2021

After-sales service of steel pipe products

After-sales service is not only dealing with the quality of the products sold, but also includes technical exchanges with customers, providing customers with technical support, and quality visits to expand the impact on the company’s products and achieve the expectation of opening up the market and occupying the market. Handling of objections to the quality of the products sold: 1. Requirements for dissimilar handling: After receiving the dissatisfaction notice, the dissident handling personnel should rush to the dissent site as soon as possible (not more than 24 hours at the latest), and determine whether it is our company’s product first; […]
September 30, 2021

Common quality problems of steel pipes

The common quality problems of steel pipes are divided into the following categories: 1. The internal and external quality of steel pipes; 2. Quality problems of geometric dimensions; 3. Unqualified quality problems of physical and chemical properties; 4. Quality problems of tubing and casing threads; 5. Quality problems of users in the process of processing and use; 6. The quality of packaging labeling. 1. The internal and external quality of the steel pipe The appearance quality problems of steel pipes include: external folds, cracks, splits, holes, punctures, external threads, corrections, bumps, pitted surfaces, rolling, folding. Outward folding quality defect: It […]
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 […]