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Seamless steel pipes are divided into the following varieties according to their different uses:
GB / T8162-1999 (seamless steel tubes for structures). Mainly used for general structure and mechanical structure. Its representative material (grade): carbon steel 20 and 45 steel; Alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35crmo, 42CrMo, etc.
GB / t8163-1999 (seamless steel pipe for fluid transport). It is mainly used for conveying fluid pipes on engineering and large-scale equipment. The representative materials (brand) are 20, Q345, etc.
GB3087-1999 (seamless steel tubes for low and medium pressure boilers). It is mainly used for industrial boilers and domestic boilers to transport low and medium pressure fluids. The representative materials are 10 and 20 steel.
GB5310-1995 (seamless steel tubes for high pressure boilers). It is mainly used for high-temperature and high-pressure transmission fluid headers and pipes on boilers of power plants and nuclear power plants. The representative materials are 20g, 12Cr1MoVG, 15CrMoG, etc.
Gb5312-1999 (carbon steel and carbon manganese steel seamless steel pipes for ships). It is mainly used for class I and II pressure resistant pipes for marine boilers and superheaters. The representative materials are 360, 410 and 460 steel grades.
Gb1479-2000 (seamless steel pipe for high pressure chemical fertilizer equipment). It is mainly used for conveying high-temperature and high-pressure fluid pipes on fertilizer equipment. The representative materials are 20, 16Mn, 12CrMo, 12cr2mo, etc.
GB9948-1988 (seamless steel pipe for petroleum cracking). It is mainly used for boilers, heat exchangers and transmission fluid pipelines in oil smelters. The representative materials are 20, 12CrMo, 1Cr5Mo, 1cr19ni11nb, etc.
GB18248-2000 (seamless steel tubes for gas cylinders). It is 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 support). It is mainly used to make coal mine hydraulic supports, cylinders and columns, as well as other hydraulic cylinders and columns. The representative materials are 20, 45 and 27SiMn.
Gb3093-1986 (high pressure seamless steel pipe for diesel engine). It is mainly used for high-pressure oil pipe of diesel injection system. The steel pipe is generally cold drawn 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 with high dimensional accuracy and good surface finish for mechanical structures and carbon pressure equipment. 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 components, and its material is high-quality carbon structural steel and low-alloy structural steel.
GB / t8713-1988 (precision inner diameter seamless steel tubes for hydraulic and pneumatic cylinders). It is mainly used for making cold drawn or cold rolled seamless steel pipes with precise inner diameter for hydraulic and pneumatic cylinders. The representative materials are 20 and 45 steel.
GB13296-1991 (stainless steel seamless steel tubes for boilers and heat exchangers). It is mainly used for boilers, superheaters, heat exchangers, condensers and catalytic tubes in chemical enterprises. High temperature, high pressure and corrosion resistant steel pipes used. The representative materials are 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc.
GB / T14975-1994 (stainless steel seamless steel pipe for structure). It is mainly used for general structure (decoration of hotels and restaurants) and mechanical structure of chemical enterprises, which is resistant to atmospheric and acid corrosion and has certain strength. The representative materials are 0-3cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc.
GB / t14976-1994 (stainless steel seamless steel pipe for fluid transmission). It is mainly used for pipelines conveying corrosive media. The representative materials are 0Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr17Ni12Mo2, 0Cr18Ni12Mo2Ti, etc.
Yb / t5035-1993 (seamless steel pipe for automobile half shaft sleeve pipe). It is mainly used to make high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipes for automobile half shaft casing and axle shell of drive axle. The representative materials are 45, 45Mn2, 40Cr, 20crni3a, etc.