The national executive standards for welded steel pipes are as follows:
GB/T3091-1993 (Galvanized Welded Steel Pipe for Low Pressure Fluid Transportation)
It is mainly used for conveying water, gas, air, oil, heating hot water or steam, and other generally low pressure fluids and other purposes. Its representative material is Q235A grade steel.
GB/T3092-1993 (Galvanized Welded Steel Pipe for Low Pressure Fluid Transportation)
It is mainly used for conveying water, gas, air, oil, heating hot water or steam, and other generally low pressure fluids and other purposes. The representative material is Q235A grade steel.
GB/T14291-1992 (Welded Steel Pipe for Mineral Fluid Transportation)
It is mainly used for straight seam welded steel pipes for mine air pressure, drainage, and shaft gas discharge. Its representative material is Q235A and B grade steel.
GB/T12770-1991 (Stainless Steel Welded Steel Tubes for Mechanical Structures)
Mainly used for machinery, cars, bicycles, furniture, hotel and restaurant decoration, and other mechanical components and structural components. It represents 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.
GB/T12771-1991 (Stainless Steel Welded Pipe for Fluid Transportation)
Mainly used for transporting low pressure corrosive media. Representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 0Cr18Ni11Nb, 0017Cr17Ni14M