GB9948-1988 (seamless steel pipe for petroleum cracking). Mainly used in boilers, heat exchangers, and pipelines for transporting fluids in petroleum refineries. Its representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb, etc.

GB18248-2000 (seamless steel pipe for gas cylinders). Mainly used to make various gas and hydraulic cylinders. Its representative materials are 37Mn, 34Mn2V, 35CrMo, etc.

GB/T17396-1998 (hot-rolled seamless steel pipe for hydraulic props). It is mainly used to make hydraulic supports, cylinders, and columns in coal mines, as well as other hydraulic cylinders and columns. Its representative materials are 20, 45, 27SiMn, etc.

GB3093-1986 (high-pressure seamless steel pipe for diesel engines). Mainly used for high-pressure oil pipes in diesel engine injection systems. The steel pipe is generally cold-drawn pipe, and its representative material is 20A.

GB/T3639-1983 (cold drawn or cold rolled precision seamless steel pipe). It is mainly used for steel pipes used in mechanical structures and carbon pressing equipment that require high dimensional accuracy and good surface finish. Its representative materials include 20, 45 steel, etc.

GB/T3094-1986 (cold drawn seamless steel pipe and special-shaped steel pipe). It is mainly used to make various structural parts and parts, and its materials are high-quality carbon structural steel and low alloy structural steel.

GB/T8713-1988 (Precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders). It is mainly used to produce cold-drawn or cold-rolled seamless steel pipes with precise inner diameters for hydraulic and pneumatic cylinders. Its representative materials are 20, 45 steel, etc.

GB13296-1991 (stainless steel seamless steel pipes for boilers and heat exchangers). Mainly used in boilers, superheaters, heat exchangers, condensers, catalytic tubes, etc. in chemical enterprises. High-temperature, high-pressure, and corrosion resistant steel pipes are used. Its representative materials are 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc.