GB/T8162-2008 (Seamless steel pipe for Structures):
Mainly used in general structure and mechanical structure.
Its representative materials (brand): carbon steel 20, 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.
GB/T8163-2008 (Seamless steel pipe for conveying fluid):
It is mainly used for conveying fluid pipelines on engineering and large-scale equipment. Represents material quality (brand) 20, Q345, etc.
GB9948-2006 (Seamless Steel pipes for Petroleum Cracking):
It is mainly used in boilers, heat exchangers and fluid pipelines of petroleum smelters.
Its representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb, etc.
GB/T3639-1983 (Cold Drawn or Cold Rolled Precision Seamless Steel pipes):
Mainly used for mechanical structure, carbon pressing equipment, high dimensional accuracy, good surface finish steel pipe.
Its representative material is 20, 45 steel, etc.
API SPEC5CT-1999 (Casing and tubing specifications):
They were compiled and published by the American Petroleum Instiute (API), and are widely used all over the world.
Among them: Casing: the pipe that extends into the drilling hole from the surface, serves as the lining of the well wall, and connects the pipes through the coupling. The main materials are J55, N80, P110 and C90, T95, which are resistant to hydrogen sulfide corrosion. Its low grade steel (J55, N80) can be welded steel pipe.
Tubing: A pipe that is inserted from the surface into the casing to the reservoir and is connected by a coupling or an integral part. Its function is to transport oil from reservoir to surface through tubing by pumping unit. The main materials are J55, N80, P110, C90 which is resistant to hydrogen sulfide corrosion.