Because of its different manufacturing processes, seamless steel tubes are divided into hot rolled (extrusion) seamless steel tubes and cold drawn seamless steel tubes. Cold drawn tubes are divided into two types: round tubes and shaped tubes.
Process Overview
Hot rolling (extrusion seamless steel pipe): round billet → heating → perforation → three-roller oblique rolling, continuous rolling or extrusion → stripping → sizing (or reducing) → cooling → blank tube → straightening → water pressure Test (or flaw detection) → mark → storage.
Cold drawn (rolled) seamless steel tube: round tube blank → heating → piercing → start → annealing → pickling → oil coating (copper plating) → multi-pass cold drawing (cold rolling) → blank tube → heat treatment → straightening → Hydrostatic test (flaw detection) → mark → storage.
Seamless steel tubes are divided into the following categories due to their different uses:
GB/T8162-2008 (structural seamless steel pipe).
Mainly used for general structure and mechanical structure. On behalf of the material (brand): carbon steel 20,45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo and so on.
GB/T8163-2008 (seamless steel pipe for conveying fluids). It is mainly used for conveying fluid pipelines in engineering and large-scale equipment. Representative material (brand) is 20, Q345 and so on.
GB3087-2008 (Seamless boilers for low and medium pressure boilers). Mainly used for industrial boilers and domestic boilers to transport low and medium pressure fluids. Representative materials for the 10,20 steel.
GB5310-1995 (high pressure boiler seamless steel tubes).
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 (Carbon and carbon-manganese steel seamless steel 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 steel 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 steel pipe).
It is mainly used in boilers, heat exchangers and pipelines for transporting fluids in petroleum smelters. Representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb and so on.
GB18248-2000 (Seamless steel tubes for gas cylinders).
Mainly used for the production of various gas, hydraulic cylinders. Representative materials are 37Mn, 34Mn2V, 35CrMo and so on.
GB/T17396-1998 (Hot-rolled seamless steel tubes for hydraulic props).
It is mainly used for making coal mine hydraulic supports and cylinders, columns, and other hydraulic cylinders and columns. Representative material is 20, 45, 27SiMn and so on.
GB3093-1986 (high pressure seamless steel tubes for diesel engines).
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 steel tubes).
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 steel 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 (precision inner diameter seamless steel tubes for hydraulic and pneumatic cylinders).
It is mainly used for making cold drawn or cold rolled seamless steel tubes with precision 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 steel pipe). 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 (stainless steel seamless pipe for structural use). 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 (stainless steel seamless pipe for fluid transport). Mainly used for conveying corrosive media. Representative materials are 0Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr17Ni12Mo2, 0Cr18Ni12Mo2Ti and so on.
YB/T5035-1993 (Seamless steel tubes for automotive axle sleeves). It is mainly used for the production of high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel tubes used for automobile axle bushings and drive axle axle tubes. Its representative material is 45, 45Mn2, 40Cr, 20CrNi3A and so on.
Process Overview
Hot rolling (extrusion seamless steel pipe): round billet → heating → perforation → three-roller oblique rolling, continuous rolling or extrusion → stripping → sizing (or reducing) → cooling → blank tube → straightening → water pressure Test (or flaw detection) → mark → storage.
Cold drawn (rolled) seamless steel tube: round tube blank → heating → piercing → start → annealing → pickling → oil coating (copper plating) → multi-pass cold drawing (cold rolling) → blank tube → heat treatment → straightening → Hydrostatic test (flaw detection) → mark → storage.
Seamless steel tubes are divided into the following categories due to their different uses:
GB/T8162-2008 (structural seamless steel pipe).
Mainly used for general structure and mechanical structure. On behalf of the material (brand): carbon steel 20,45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo and so on.
GB/T8163-2008 (seamless steel pipe for conveying fluids). It is mainly used for conveying fluid pipelines in engineering and large-scale equipment. Representative material (brand) is 20, Q345 and so on.
GB3087-2008 (Seamless boilers for low and medium pressure boilers). Mainly used for industrial boilers and domestic boilers to transport low and medium pressure fluids. Representative materials for the 10,20 steel.
GB5310-1995 (high pressure boiler seamless steel tubes).
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 (Carbon and carbon-manganese steel seamless steel 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 steel 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 steel pipe).
It is mainly used in boilers, heat exchangers and pipelines for transporting fluids in petroleum smelters. Representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb and so on.
GB18248-2000 (Seamless steel tubes for gas cylinders).
Mainly used for the production of various gas, hydraulic cylinders. Representative materials are 37Mn, 34Mn2V, 35CrMo and so on.
GB/T17396-1998 (Hot-rolled seamless steel tubes for hydraulic props).
It is mainly used for making coal mine hydraulic supports and cylinders, columns, and other hydraulic cylinders and columns. Representative material is 20, 45, 27SiMn and so on.
GB3093-1986 (high pressure seamless steel tubes for diesel engines).
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 steel tubes).
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 steel 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 (precision inner diameter seamless steel tubes for hydraulic and pneumatic cylinders).
It is mainly used for making cold drawn or cold rolled seamless steel tubes with precision 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 steel pipe). 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 (stainless steel seamless pipe for structural use). 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 (stainless steel seamless pipe for fluid transport). Mainly used for conveying corrosive media. Representative materials are 0Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr17Ni12Mo2, 0Cr18Ni12Mo2Ti and so on.
YB/T5035-1993 (Seamless steel tubes for automotive axle sleeves). It is mainly used for the production of high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel tubes used for automobile axle bushings and drive axle axle tubes. Its representative material is 45, 45Mn2, 40Cr, 20CrNi3A and so on.
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