Seamless steel pipe supplied according to the performance of the organization, generally carbon steel is made according to GB/T700-88 Class A steel (but it is necessary to ensure that the sulfur content does not exceed 0.050% and the phosphorus content does not exceed 0.045%), and its mechanical properties should be Match the values of the rules in the table of GB8162-87. The domestic seamless pipe supplied by the hydraulic test is necessary to ensure the water pressure test as specified in the specification. The physical property inspection of imported seamless pipes shall be carried out in accordance with the relevant norms of the contract rules.
Use: Seamless pipes are used in a wide range of applications. The commonly used seamless pipe is rolled from ordinary carbon structural steel, low alloy structural steel or alloy structural steel, and has the largest output value, and is mainly used as a pipe or structural part for transporting fluid. According to the different uses, there are three types of supply:
a. Supplied by chemical composition and mechanical properties;
b. According to mechanical performance supply;
c. Supply according to water pressure test.
Steel pipes supplied in categories a and b, if used to withstand liquid pressure, are also subjected to hydrostatic testing. The seamless pipes for special use include boiler seamless pipes, geological seamless pipes, and petroleum seamless pipes.
Variety: Seamless steel pipes can be divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, kneaded pipes, etc. according to different production methods; according to the shape, there are round pipes and special-shaped pipes. In addition to the square tube and the rectangular tube, the special-shaped tube also has an elliptical tube, a semi-circular tube, a triangular tube, a hexagonal tube, a convex-shaped tube, a plum-shaped tube, etc.; according to different raw materials, it is divided into a general carbon structural tube and a low-alloy structure. Pipe, high-quality carbon structural pipe, alloy structural pipe, stainless pipe, etc.; according to special use, there are boiler tubes, geological pipes,
casing pipes, etc.
