The main purpose of seamless steel pipe is that general seamless steel pipe is made of carbon structural steel, high alloy general steel, high quality alloy steel and alloy tool steel hot clamped or drawn in cold. Seamless steel pipes produced by numbers 10 and 20 and other high-carbon steels are mainly used as gas pipelines for steam, liquefied gas, liquefied petroleum gas, gas, various crude oil commodities and various vapors or liquids; 45, 40Cr and other low carbon production seamless steel pipes, the key is used in the production of a variety of equipment accessories and pipe fittings. Seamless steel pipe is made of a complete piece of metal material, and there is no seamless steel pipe in the surface layer, which is called seamless steel pipe. According to the manufacturing method, seamless steel pipe is divided into hot tied pipe, cold tied pipe, cold drawn pipe, extruded pipe, drawn pipe construction, etc. According to the appearance of the cross section, the seamless steel pipe is divided into two types: ring and special shape, and the special shape pipes have square, oval, triangular, hexagonal, sunflower seed, star and fin pipe. . The largest diameter is up to 650mm, and the minimum diameter is 0.3mm. According to the main use, there are thick-walled steel pipes and thin-walled pipes. Seamless steel pipe is mainly used as crude oil geological exploration pipe, cracking pipe for petrochemical equipment, boiler pipe, bearing pipe and its carriage, large tractor and high precision structural steel pipe for airlines.
