The anti-corrosion seamless steel pipe factory has a complete range of precision seamless steel pipe stock models

Description :

　　Seamless pipe is a long steel strip with a hollow cross-section and no seams around it. Compared with solid steel such as round steel, steel pipes are lighter in weight when their bending and torsional strength is the same, making them an economical cross-sectional steel. After perforation, the round billet is successively subjected to three roll oblique rolling, continuous rolling, or extrusion. After squeezing, the tube should be removed and the diameter adjusted. The sizing machine uses a conical drill bit to rotate at high speed into the steel billet to drill holes and form steel pipes. The inner diameter of the steel pipe is determined by the outer diameter length of the drill bit of the sizing machine.

　　The production process of seamless steel pipes can be divided into two types: cold drawing and hot rolling. The production process of cold-rolled seamless steel pipes is generally more complex than that of hot rolling. The pipe blank first needs to undergo three roll continuous rolling, and after extrusion, it needs to undergo sizing testing. If there is no response crack on the surface, the round pipe needs to be cut by a cutting machine to a length of about one meter. Then enter the annealing process, which requires acid washing with an acidic liquid. During acid washing, attention should be paid to whether there are a large number of bubbles on the surface. If there are a large number of bubbles, it indicates that the quality of the steel pipe does not meet the corresponding standards. The wall thickness of cold-rolled seamless steel pipes is generally smaller than that of hot-rolled seamless steel pipes, but the surface looks brighter than thick walled seamless steel pipes, with less roughness on the surface and fewer burrs on the diameter. The delivery status of hot-rolled seamless steel pipes is generally after heat treatment in the hot-rolled state. After quality inspection, hot-rolled seamless steel pipes must undergo strict manual selection by staff. After quality inspection, the surface must be coated with oil, followed by multiple cold drawing experiments. After hot rolling treatment, perforation experiments must be conducted. If the perforation diameter is too large, straightening and correction must be carried out. After straightening, it is transported by the conveying device to the flaw detector for flaw detection experiments. After labeling and specification arrangement, it is placed in the warehouse.

　　According to different purposes, there are three types of supply: a. Supply based on chemical composition and mechanical properties; b、 Supply based on mechanical performance; c、 Supply according to hydraulic pressure test. Steel pipes supplied according to categories A and B, if used to withstand liquid pressure, also need to undergo hydrostatic testing. There are various types of seamless pipes for specialized purposes, including seamless pipes for boilers, seamless steel pipes for chemical and electrical industries, seamless steel pipes for geological applications, and seamless pipes for petroleum applications. Seamless steel pipes have a hollow cross-section and are widely used as pipelines for transporting fluids, such as oil, natural gas, coal gas, water, and certain solid materials. Compared to solid steel materials such as round steel, steel pipes.

　　In November 2018, China's production of No. 20 seamless pipes was 2.572 million tons, an increase of 299000 tons compared to the same period last year, achieving a year-on-year growth of 13.2% and a month on month growth of 3.71%; From January to November, the cumulative production of No. 20 seamless pipes in China reached 25.635 million tons, a year-on-year increase of 8.2%. With the continuous intensification of competition in the seamless pipe industry, mergers and acquisitions and capital operations among large No. 20 seamless pipe enterprises have become increasingly frequent. Excellent seamless pipe production enterprises in China are paying more and more attention to research on the industry market, especially in-depth research on the development environment of enterprises and changes in customer demand trends. Because of this, a large number of excellent domestic seamless pipe brands have rapidly emerged and gradually become leaders in the seamless pipe industry!

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• Anti corrosion seamless steel pipe