Seamless steel pipe is a long steel strip with a hollow cross-section and no seams around it. Seamless steel pipes have a hollow cross-section and can be used as pipes for transporting fluids. Compared with solid steel such as round steel, steel pipes have the same bending and torsional strength and are lighter in weight. As a kind of steel, it is widely used in the production of structural parts and mechanical design parts, such as oil drill pipes, automobile transmission shafts, bicycle frames and steel scaffolding for construction. Seamless steel pipes have a wide range of uses. General-purpose seamless steel pipes are affected by output. It is rolled from the largest ordinary carbon structural steel, low alloy structural steel or alloy structural steel, and can be mainly used as pipes or structural parts for conveying system fluids.
There are three supply types of steel pipe supplies according to different uses:
1. Supplied according to chemical composition and mechanical system performance;
2. Supplied according to mechanical properties;
3. Supplied based on hydrostatic test
Seamless steel pipes include special seamless pipes, boiler seamless pipes, geological seamless steel pipes and petroleum seamless pipes, etc. Welded steel pipe, also known as welded pipe, is made of steel plate or steel strip die-welded steel pipe. The production process design of jointed steel pipes is simple, the production efficiency is high, there are many varieties and specifications, and the enterprise equipment investment is small, but the overall strength is lower than seamless steel pipes.
Since the 1930s, with the rapid and healthy development of economical and high-quality strip rolling production and the continuous improvement of welding method detection information technology, weld quality problems have continued to increase, the varieties and specifications of welded steel pipes have continued to increase, and seamless steel pipes have More and more areas are being replaced. During the welding process, steel pipes can be divided into straight seam pipes and spiral welded pipes according to the weld structure.
The production technology of straight seam tubes is simple, with high production efficiency, low cost and rapid economic development. Generally, the strength of spiral welded pipes is higher than that of straight welded pipes. Narrow hairs can be used to produce larger diameter pipes, or the same width of hairs can be used to produce pipes of different diameters.
However, compared with straight seam pipes of the same length, the weld length can be increased by 30~100%, and for enterprises, the production speed is relatively low. Therefore, small-diameter welded pipes mostly use straight seams, and large-diameter pipes mostly use spiral welding.
On the whole, my country's seamless steel pipe industry has achieved certain results in the transformation, development and upgrading stage, but there is still a certain distance from the global seamless steel pipe power, and my country's seamless steel pipe companies still need to continue to work hard. In the context of supply-side reform, companies should abandon the development path of quantitative success, pay more attention to the added value of products, and create high-quality products. Looking to the future, under future development trends, China's seamless steel pipe industry will move toward the direction of high-end products, market concentration, and green and intelligent production.
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www.baowi-steel.com