Seamless steel pipes are divided into two types: hot-rolled (extruded) seamless steel pipes and cold-drawn (rolled) seamless steel pipes due to their different manufacturing processes.
Process overview: hot rolling (extruded seamless steel pipe): round tube billet → heating → piercing → three-roll cross rolling, continuous rolling or extrusion → tube removal → sizing (or reducing) → cooling → billet tube.
Due to their different uses, seamless steel pipes are divided into the following varieties: GB/T8162 (seamless steel pipes for structural purposes),Carbon steel No. 20 and No. 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.
GB/T8163 (seamless steel pipes for conveying fluids).It is mainly used for conveying fluid pipelines on engineering and large equipment.Representative materials (grades) are 20, Q345, etc.
GB3087 (seamless steel pipes for low and medium pressure boilers).It is mainly used for pipelines for conveying low and medium pressure fluids in industrial boilers and domestic boilers.Representative materials are No. 10 and No. 20 steel.
GB5310 (seamless steel pipes for high pressure boilers).It is mainly used for high temperature and high pressure transport fluid headers and pipelines on boilers in power plants and nuclear power plants.Representative materials are 20G, 12Cr1MoVG, 15CrMoG, etc.
GB5312 (carbon steel and carbon-manganese steel seamless steel pipes for ships).It is mainly used for Class I and II pressure pipes for ship boilers and superheaters.Representative materials are 360, 410, 460 steel grades, etc.
GB1479 (seamless steel pipes for high-pressure fertilizer equipment).It is mainly used to transport high-temperature and high-pressure fluid pipelines on chemical fertilizer equipment.Representative materials are 20, 16Mn, 12CrMo, 12Cr2Mo, etc.
GB9948 (seamless steel pipes for petroleum cracking).Mainly used in boilers, heat exchangers and pipelines for conveying fluids in petroleum smelters.Its representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb and so on.
GB3093 (high pressure seamless steel pipe for diesel engine).It is mainly used for high-pressure fuel pipes of diesel engine injection systems.The steel pipe is generally a cold drawn pipe, and its representative material is 20A.
GB/T3639 (cold-drawn or cold-rolled precision seamless steel tubes).Mainly used for mechanical structures and carbon press equipment, steel pipes requiring high dimensional accuracy and good surface finish.Its representative material is 20, 45 steel and so on.
GB/T3094 (cold-drawn seamless steel pipe special-shaped steel pipe).It is mainly used to make various structural parts and parts, and its material is high-quality carbon structural steel and low-alloy structural steel.
GB/T8713 (Precision inner diameter seamless steel tubes for hydraulic and pneumatic cylinders).It is mainly used to make cold-drawn or cold-rolled seamless steel pipes with precise inner diameters for hydraulic and pneumatic cylinders.Its representative materials are 20, 45 steel and so on.
GB13296 (stainless steel seamless tubes for boilers and heat exchangers).It is mainly used in boilers, superheaters, heat exchangers, condensers, catalytic tubes, etc. of chemical enterprises.Its representative materials are 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc.
GB/T14975 (stainless steel seamless steel pipe for structural use).It is mainly used for general structure (hotel, restaurant decoration) and chemical enterprise mechanical structure resistant to air, acid corrosion and steel pipe with certain strength.Its representative materials are 0-3Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc.
GB/T14976 (stainless steel seamless steel pipe for fluid transportation).It is mainly used for pipelines conveying corrosive media.Representative materials are 0Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr17Ni12Mo2, 0Cr18Ni12Mo2Ti, etc.
YB/T5035 (seamless steel tubes for automobile axle shaft casings).It is mainly used to make high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel tubes for automobile half-axle casings and axle tubes for drive axle housings.Its representative materials are 45, 45Mn2, 40Cr, 20CrNi3A and so on.
API SPEC5CT (Casing and Tubing Specification) is compiled and published by the American Petroleum Institute (American Petreleum Institute, referred to as "API") and is commonly used around the world.
Among them, casing: the pipe extending from the ground surface into the well as the lining of the well wall, and the pipes are connected by collars.The main materials are steel grades such as J55, N80, and P110, and steel grades such as C90 and T95 that are resistant to hydrogen sulfide corrosion.
Oil pipe: A pipe that is inserted into the casing from the ground surface to the oil layer, and the pipes are connected by couplings or integrally.The main materials are J55, N80, P110, and steel grades such as C90 and T95 that are resistant to hydrogen sulfide corrosion.API SPEC 5L (Line Pipe Specification), compiled and published by the American Petroleum Institute, is commonly used around the world.Line pipe: it is to transport the oil, gas or water from the shaft to the oil and gas industry through the line pipe.
Line pipes include seamless and welded pipes, and the pipe ends have flat ends, threaded ends and socket ends; the connection methods are end welding, collar connection, socket connection, etc.The main material of the pipe is B, X42, X56, X65, X70 and other steel grades.
The blanks used for welded steel pipes are steel plates or strip steel. Because of their different materials and processes, welded pipes are divided into furnace welded pipes, electric welding (resistance welding) pipes and automatic arc welded pipes.Because of its end shape, it is divided into round welded pipe and special-shaped (square, flat, etc.) welded pipe for different purposes, and is divided into the following varieties:
GB/T3091 (galvanized welded steel pipe for low-pressure fluid transmission).Mainly used for conveying water, gas, air, oil and heating hot water or steam and other general lower pressure fluids and other purposes.Its representative material is Q235A grade steel.
GB/T3092 (galvanized welded steel pipe for low-pressure fluid transmission).Mainly used for conveying water, gas, air, oil and heating hot water or steam and other general lower pressure fluids and other purposes.Its representative material is: Q235A grade steel.
GB/T14291 (welded steel pipes for mine fluid conveyance).It is mainly used for straight seam welded steel pipes for mine compressed air, drainage, and shaft discharge gas.Its representative material is Q235A and B grade steel.
GB/T14980 (Large-diameter electric-welded steel pipes for low-pressure fluid transmission).Mainly used for conveying water, sewage, gas, air, heating steam and other low-pressure fluids and other purposes.Its representative material is Q235A grade steel.
GB/T12770 (stainless steel welded steel pipes for mechanical structures).Mainly used in machinery, automobiles, bicycles, furniture, hotel and restaurant decoration and other mechanical parts and structural parts.Its representative materials are 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.
GB/T12771 (stainless steel welded steel pipes for fluid transportation).Representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, etc.
Post time: Feb-14-2023