Steel Pipe
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As an important part of steel products, steel pipes are divided into two categories: seamless steel pipes and welded steel pipes due to their different manufacturing processes and shapes of the tube blanks used.
Description
Because of their different manufacturing processes, they are divided into two types: hot-rolled (extruded) seamless steel pipes and cold-rolled seamless steel pipes.
The blanks used in welded steel pipes are steel plates or strips. Due to their different welding processes, they are divided into furnace welded pipes, electric welded (resistance welded) pipes and automatic arc welded pipes. Because of their different welding forms, they are divided into two types: straight seam welded pipes and spiral welded pipes. Because of their end shapes, they are divided into round welded pipes and special-shaped (square, flat, etc.) welded pipes.
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Major Function
● GB/T8162-1999 (seamless steel pipe for structural use). Mainly used for general structures and mechanical structures. Its representative materials (grades): carbon steel No. 20, No. 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.
● GB/T8163-1999 (seamless steel pipe for transporting fluids). Mainly used for conveying fluid pipelines in engineering and large-scale equipment. Representative materials (grades) are 20, Q345, etc.
● GB3087-1999 (seamless steel pipes for low and medium pressure boilers). Mainly used in pipelines for conveying low and medium pressure fluids in industrial boilers and domestic boilers. The representative materials are No. 10 and No. 20 steel.
● GB5310-1995 (seamless steel pipes for high-pressure boilers). It is mainly used for high temperature and high pressure resistant fluid transport headers and pipelines in power plants and nuclear power plant boilers. Representative materials are 20G, 12Cr1MoVG, 15CrMoG, etc.
● GB5312-1999 (carbon steel and carbon-manganese steel seamless steel pipes for ships). Mainly used for Class I and II pressure-resistant tubes for ship boilers and superheaters. Representative materials are 360, 410, 460 steel grades, etc.
● GB1479-2000 (seamless steel pipe for high-pressure fertilizer equipment). Mainly used in fertilizer equipment to transport high temperature and high pressure fluid pipelines. Representative materials are 20, 16Mn, 12CrMo, 12Cr2Mo, etc.
● GB9948-1988 (seamless steel pipe for petroleum cracking). Mainly used in boilers, heat exchangers and pipelines for transporting fluids in petroleum refineries. Its representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb, etc.
● GB18248-2000 (seamless steel pipe for gas cylinders). 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 props). It is mainly used to make hydraulic supports, cylinders and columns in coal mines, as well as other hydraulic cylinders and columns. Its representative materials are 20, 45, 27SiMn, etc.
● GB3093-1986 (high-pressure seamless steel pipe for diesel engines). Mainly used for high-pressure oil pipes in diesel engine injection systems. The steel pipe is generally cold drawn pipe, 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 used in mechanical structures and carbon pressing equipment that require high dimensional accuracy and good surface finish. Its representative materials include 20, 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 parts, and its materials are 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 to produce cold-drawn or cold-rolled seamless steel pipes with precise inner diameters for hydraulic and pneumatic cylinders. Its representative materials are 20, 45 steel, etc.
● GB13296-1991 (stainless steel seamless steel pipes for boilers and heat exchangers). Mainly used in boilers, superheaters, heat exchangers, condensers, catalytic tubes, etc. in chemical enterprises. High temperature, high pressure and corrosion resistant steel pipes are used. Its representative materials are 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc.
● GB/T14975-1994 (stainless steel seamless steel pipe for structural use). It is mainly used for steel pipes that are resistant to atmospheric and acid corrosion and have a certain strength for general structures (hotel and restaurant decoration) and mechanical structures of chemical companies. Its representative materials are 0-3Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc.
● GB/T14976-1994 (stainless steel seamless steel pipe for fluid transportation). Mainly used for pipelines transporting corrosive media. Representative materials are 0Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr17Ni12Mo2, 0Cr18Ni12Mo2Ti, etc.
● YB/T5035-1993 (seamless steel pipe for automobile half shaft sleeve). It is mainly used to make high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipes for automobile axle sleeves and drive axle housing shaft tubes. Its representative materials are 45, 45Mn2, 40Cr, 20CrNi3A, etc.
● GB/T3091-1993 (Galvanized welded steel pipe for low-pressure fluid transportation). It is mainly used to transport water, gas, air, oil, heating hot water or steam and other general lower pressure fluids and other pipes. Its representative material is Q235A grade steel.
● GB/T14291-1992 (Welded steel pipe for mining fluid transportation). It is mainly used for straight seam welded steel pipes for mine air pressure, drainage and shaft gas discharge. Its representative materials are Q235A and B grade steel.
● GB/T14980-1994 (Large-diameter electric welded steel pipe for low-pressure fluid transportation). Mainly used for transporting low-pressure fluids such as water, sewage, gas, air, heating steam and other purposes. Its representative material is Q235A grade steel.
● GB/T12770-1991 (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 include 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc.
● GB/T12771-1991 (Stainless steel welded steel pipes for fluid transportation). Mainly used to transport low-pressure corrosive media. Representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, etc.
Technology
Round tube blank - heating - perforation - three-roll cross rolling, continuous rolling or extrusion - detubing to a certain diameter (or diameter reduction) - cooling - blank tube - straightening - hydraulic test (or flaw detection) once marked and put into storage.
Round pipe is heated, perforated, headed, annealed, pickled, oiled, multi-pass rolled, one secondary pipe, heat treated, straightened, hydraulic test (flaw detection) - marked and entered Library.
