Steel pipes mainly include seamless steel pipes and seamless steel pipes, among which seamless steel pipes can be divided into hot-rolled seamless steel pipes and cold-rolled seamless steel pipes according to different manufacturing processes. As a kind of steel profile, seamless steel pipe is generally made of carbon steel and alloy steel. Because of the different materials, the properties and uses of these two kinds of seamless steel pipes are also very different.
Generally, carbon steel pipes have not been heat-treated, and their strength is obviously worse than that of alloy steel pipes, so they are mainly used for the structures of buildings with relatively low requirements, such as factories, bridges and houses, and for conveying general fluid substances. Due to the addition of trace elements such as vanadium and titanium, the strength and other comprehensive properties of alloy steel pipes are far superior to those of ordinary carbon steel pipes, and are generally used in demanding structural construction, such as important structural parts in ships, automobiles and bridges.
There are many types and specifications of structural seamless steel pipes, and the same type of steel pipes can be divided into many different types. For example, hot-rolled seamless steel pipes are divided into 10#, 20#, 35#, 45#, 16Mn, 27SiMn, 12Cr 1Mov and 65438+ according to materials. Cold-rolled seamless steel pipes are divided into 20#, 45#, 16Mn, 40Cr, 12Cr 1MoV and other models according to materials, with an external diameter of 16-50mm and a wall thickness of 2.5-16-50mm.
Different types of seamless steel pipes for structures have different specific uses and standards due to different specifications and models. For example, the standard of seamless steel pipe for structure is GB/T8 162- 1999, and that for fluid transportation is GB/T8 163- 1999. Before choosing seamless steel pipes for structures, we should fully understand the different types, specifications and specific uses of different types of steel pipes, and we should not blindly replace them with seamless steel pipes with low prices and low costs, so as to avoid irreparable losses. For some precision instruments or important mechanical parts, we generally require that high-grade cold-rolled alloy seamless steel pipes must be used, and appropriate models and specifications should be selected.
At present, many large or small steel companies in China produce seamless steel pipes for structures. The top ten brands of China steel pipe are Pangang Chuanyu, Tubacix, Shanghai Baosteel, Tianjin TPCO, Liaoning Aotong, Handan Hongling, Hebei Xinyuantai, Hebei Shixing and Guangzhou Huaqi. The seamless steel pipes produced by these companies are all big brands, and we can be trusted.
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