Seamless tube is a long steel material with a hollow section and no joints around it. At present, there are more than 5,100 factories under more than 1,850 companies in more than 110 countries producing seamless pipes throughout the world, of which more than 260 factories are under production from more than 170 companies in 44 countries.
Specification/process seamless tube specification: 6-1240×1-200mm
Seamless tube manufacturing process: hot rolling, cold drawing, thermal expansion step/method GB/T8162-1999 (structured seamless tube). Mainly used for general structure and mechanical structure. The representative material (brand): carbon steel 20,45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo and so on.
GB/T8163-1999 (transmission fluid seamless tube). It is mainly used for conveying fluid pipelines in engineering and large-scale equipment. Representative material (brand) is 20, Q345 and so on.
GB3087-1999 (seamless boiler with low and medium pressure). Mainly used for industrial boilers and domestic boilers to transport low and medium pressure fluids. Representative materials for the 10,20 steel.
GB5310-1995 (seamless tube for high pressure boiler). Mainly used in power station and nuclear power plant boilers on high temperature, high pressure conveying fluid headers and pipes. Representative materials are 20G, 12Cr1MoVG, 15CrMoG and so on.
GB5312-1999 (Marine and carbon-manganese steel seamless tubes for ships). Mainly used for ship boiler and superheater I, II pressure pipe. Representative materials for the 360,410,460 steel grade.
GB1479-2000 (seamless pipe for high pressure fertilizer equipment). It is mainly used for conveying high-temperature and high-pressure fluid pipes on chemical fertilizer equipment. Representative materials are 20, 16Mn, 12CrMo, 12Cr2Mo and so on.
GB9948-1988 (petroleum cracking seamless pipe). It is mainly used in boilers, heat exchangers and pipelines for transporting fluids in petroleum smelters. Its representative material is 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb and so on.
GB18248-2000 (seamless tube). Mainly used for the production of various gas, hydraulic cylinders. Its representative material is 37Mn, 34Mn2V, 35CrMo and so on.
GB/T17396-1998 (Hot-rolled seamless pipes for hydraulic props). It is mainly used for making coal mine hydraulic supports and cylinders, columns, and other hydraulic cylinders and columns. Its representative material is 20, 45, 27SiMn and so on.
GB3093-1986 (high pressure seamless tube for diesel engine). Mainly used for diesel engine injection system high pressure oil pipe. The steel pipe is generally a cold-drawn pipe, and its representative material is 20A.
GB/T3639-1983 (cold drawn or cold rolled precision seamless tube). Mainly used for mechanical structure, carbon pressure equipment, requiring high dimensional accuracy, good surface finish steel pipe. Its representative material 20, 45 steel and so on.
GB/T3094-1986 (cold drawn seamless pipe shaped steel pipe). It is mainly used for making various structural parts and parts. Its material is high-quality carbon structural steel and low-alloy structural steel.
GB/T8713-1988 (hydraulic and pneumatic cylinders with precision inner diameter seamless tubes). Mainly used for making cold-drawn or cold-rolled seamless tubes with precise inner diameter dimensions for hydraulic and pneumatic cylinders. Its representative material is 20, 45 steel and so on.
GB13296-1991 (boiler, heat exchanger stainless steel seamless tube). It is mainly used for boilers, superheaters, heat exchangers, condensers, and catalytic tubes in chemical companies. Used high temperature, high pressure, corrosion resistant steel pipe. Its representative material is 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti and so on.
GB/T14975-1994 (Structural thick-walled seamless pipe). Mainly used for general structure (hotel, hotel decoration) and mechanical structure of the chemical industry with atmospheric, acid corrosion and a certain degree of strength of the steel pipe. Its representative material is 0-3Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti and so on.
GB/T14976-1994 (precision seamless tube for fluid delivery). Mainly used for conveying corrosive media. Representative materials are 0Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr17Ni12Mo2, 0Cr18Ni12Mo2Ti and so on.
YB/T5035-1993 (seamless casing for automotive axle bushes). It is mainly used for the production of high-quality carbon structural steel and alloy structural steel hot-rolled seamless tubes for automobile axle bushings and drive axle axle tubes. Its representative material is 45, 45Mn2, 40Cr, 20CrNi3A and so on.
Matters needing attention to distinguish between seamless pipe according to purpose, commonly used method of distinguishing seamless pipe in accordance with specifications and so on.
Specification/process seamless tube specification: 6-1240×1-200mm
Seamless tube manufacturing process: hot rolling, cold drawing, thermal expansion step/method GB/T8162-1999 (structured seamless tube). Mainly used for general structure and mechanical structure. The representative material (brand): carbon steel 20,45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo and so on.
GB/T8163-1999 (transmission fluid seamless tube). It is mainly used for conveying fluid pipelines in engineering and large-scale equipment. Representative material (brand) is 20, Q345 and so on.
GB3087-1999 (seamless boiler with low and medium pressure). Mainly used for industrial boilers and domestic boilers to transport low and medium pressure fluids. Representative materials for the 10,20 steel.
GB5310-1995 (seamless tube for high pressure boiler). Mainly used in power station and nuclear power plant boilers on high temperature, high pressure conveying fluid headers and pipes. Representative materials are 20G, 12Cr1MoVG, 15CrMoG and so on.
GB5312-1999 (Marine and carbon-manganese steel seamless tubes for ships). Mainly used for ship boiler and superheater I, II pressure pipe. Representative materials for the 360,410,460 steel grade.
GB1479-2000 (seamless pipe for high pressure fertilizer equipment). It is mainly used for conveying high-temperature and high-pressure fluid pipes on chemical fertilizer equipment. Representative materials are 20, 16Mn, 12CrMo, 12Cr2Mo and so on.
GB9948-1988 (petroleum cracking seamless pipe). It is mainly used in boilers, heat exchangers and pipelines for transporting fluids in petroleum smelters. Its representative material is 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb and so on.
GB18248-2000 (seamless tube). Mainly used for the production of various gas, hydraulic cylinders. Its representative material is 37Mn, 34Mn2V, 35CrMo and so on.
GB/T17396-1998 (Hot-rolled seamless pipes for hydraulic props). It is mainly used for making coal mine hydraulic supports and cylinders, columns, and other hydraulic cylinders and columns. Its representative material is 20, 45, 27SiMn and so on.
GB3093-1986 (high pressure seamless tube for diesel engine). Mainly used for diesel engine injection system high pressure oil pipe. The steel pipe is generally a cold-drawn pipe, and its representative material is 20A.
GB/T3639-1983 (cold drawn or cold rolled precision seamless tube). Mainly used for mechanical structure, carbon pressure equipment, requiring high dimensional accuracy, good surface finish steel pipe. Its representative material 20, 45 steel and so on.
GB/T3094-1986 (cold drawn seamless pipe shaped steel pipe). It is mainly used for making various structural parts and parts. Its material is high-quality carbon structural steel and low-alloy structural steel.
GB/T8713-1988 (hydraulic and pneumatic cylinders with precision inner diameter seamless tubes). Mainly used for making cold-drawn or cold-rolled seamless tubes with precise inner diameter dimensions for hydraulic and pneumatic cylinders. Its representative material is 20, 45 steel and so on.
GB13296-1991 (boiler, heat exchanger stainless steel seamless tube). It is mainly used for boilers, superheaters, heat exchangers, condensers, and catalytic tubes in chemical companies. Used high temperature, high pressure, corrosion resistant steel pipe. Its representative material is 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti and so on.
GB/T14975-1994 (Structural thick-walled seamless pipe). Mainly used for general structure (hotel, hotel decoration) and mechanical structure of the chemical industry with atmospheric, acid corrosion and a certain degree of strength of the steel pipe. Its representative material is 0-3Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti and so on.
GB/T14976-1994 (precision seamless tube for fluid delivery). Mainly used for conveying corrosive media. Representative materials are 0Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr17Ni12Mo2, 0Cr18Ni12Mo2Ti and so on.
YB/T5035-1993 (seamless casing for automotive axle bushes). It is mainly used for the production of high-quality carbon structural steel and alloy structural steel hot-rolled seamless tubes for automobile axle bushings and drive axle axle tubes. Its representative material is 45, 45Mn2, 40Cr, 20CrNi3A and so on.
Matters needing attention to distinguish between seamless pipe according to purpose, commonly used method of distinguishing seamless pipe in accordance with specifications and so on.
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