Seamless steel pipes are divided into the following varieties for different purposes:
GB/T8162-1999 (seamless steel tube for structure). It is mainly used for general structure and mechanical structure. Its representative material (grade): carbon steel 20, 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo and so on.
GB/T8163-1999 (seamless steel pipe for conveying fluid). It is mainly used for conveying fluid pipes on engineering and large equipment. The material (grade) is 20, Q345 and so on.
GB3087-1999 (Seamless Steel Tube for Low and Medium Pressure Boilers). Mainly used in industrial boilers and domestic boilers to transport low and medium pressure fluid pipelines. The representative material is steel No. 10 and No. 20.
GB5310-1995 (seamless steel tube for high pressure boiler). It is mainly used for high temperature and high pressure conveying fluid collecting box and pipeline in power plant and nuclear power plant boiler. The material is 20G, 12Cr1MoVG, 15CrMoG, etc.
GB5312-1999 (marine carbon steel and carbon manganese steel seamless steel tube). It is mainly used for marine boiler and Superheater I and II class pressure pipe. The material is 360, 410 and 460 steel grade.
GB1479-2000 (seamless steel pipe for high pressure chemical fertilizer equipment). It is mainly used for transporting high temperature and high pressure fluid pipes on chemical fertilizer equipment. The material is 20, 16Mn, 12CrMo, 12Cr2Mo and so on.
GB9948-1988 (seamless steel pipe for oil cracking). It is mainly used for boilers, heat exchangers and delivery fluid pipes in petroleum refineries. Its representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb and so on.
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 and so on.
GB/T17396-1998 (hot rolled seamless steel pipe for hydraulic props). The utility model is mainly used for making coal mine hydraulic support and cylinders, columns, and other hydraulic cylinders and columns. Its representative material is 20, 45, 27SiMn and so on.
GB3093-1986 (high pressure seamless steel tube for diesel engine). It is mainly used for high pressure tubing of diesel injection system. Its steel tube is generally cold drawn pipe, its representative material is 20A.
GB/T3639-1983 (cold drawn or cold rolled precision seamless steel pipe). It is mainly used for mechanical structure, carbon pressure equipment, steel pipe with high dimensional accuracy and good surface finish. Its representative material 20, 45 steel and so on.
GB/T3094-1986 (cold drawn seamless steel tube special-shaped steel pipe). It is mainly used for making various structural parts and parts, which are made of 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 for producing cold drawn or cold-rolled seamless steel tubes with precision inner diameter for hydraulic and pneumatic cylinders. Its representative material is 20, 45 steel and so on.
GB13296-1991 (stainless steel seamless tubes for boilers and heat exchangers). It is mainly used for boilers, superheater, heat exchangers, condensers, catalytic tubes and so on in chemical enterprises. High temperature, high pressure and corrosion-resistant steel pipes. Its representative materials are 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti and so on.
GB/T14975-1994 (structural stainless steel seamless steel tube). It is mainly used for general structure (guesthouse, hotel decoration) and chemical industry mechanical structure, which is resistant to atmospheric, acid corrosion and has certain strength of steel pipe. Its representative materials are 0-3Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti and so on.
GB/T14976-1994 (stainless steel seamless pipe for fluid transportation). It is mainly used for transporting corrosive medium pipes. The material is 0Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr17Ni12Mo2, 0Cr18Ni12Mo2Ti, etc.
YB/T5035-1993 (automobile semi axle sleeve seamless steel tube). It is mainly used for making high quality carbon structural steel and alloy structural steel hot-rolled seamless steel tube for automobile half axle bushing and driving axle housing. Its representative materials are 45, 45Mn2, 40Cr, 20CrNi3A and so on.