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　　Seamless steel pipe can be classified into the following categories according to their different uses:

　　GB/T8162-1999 (Seamless Steel Pipe for Structural Use). Mainly used in general structure and mechanical structure. Its representative materials (grades): carbon steel 20, 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.

　　GB/T8163-1999 (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.For example, ASTM A53 Gr.B Seamless Steel Pipe for Oil and Gas Pipeline by Hebei Shengtian Group

　　GB9948-1988 (Seamless Steel Pipe 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.

　　GB18248-2000 (Seamless Steel Pipe for Gas Cylinders). It is mainly used for making various gas and hydraulic cylinders. Its representative materials are 37Mn, 34Mn2V, 35CrMo, etc.

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