Changzhou Chengxin Metal Products Co., Ltd. focuses on hydraulic cold drawn pipe and high-frequency
welded pipe.
What are the classifications of seamless steel pipes and their applications?
Seamless steel pipes are divided into hot rolled (extruded) seamless steel pipes and cold drawn (rolled) seamless steel pipes due to their different manufacturing processes. Cold drawn (rolled) tubes are divided into round tubes and special-shaped tubes.
a. Overview of process flow
Hot rolling (extrusion of seamless steel tubes): round tube blank → heating → piercing → three roll cross rolling, continuous rolling or extrusion → pipe stripping → sizing (or reducing) → cooling → blank tube → straightening → hydrostatic test (or flaw detection) → marking → warehousing.
Cold drawn (rolled) seamless
Steel Pipe:
round pipe blank → heating → piercing → heading → annealing → pickling → oiling (copper plating) → multi pass cold drawn (cold rolled) → blank pipe → heat treatment → straightening → hydrostatic test (flaw detection) → marking → warehousing.
b. Seamless steel pipes can be divided into the following categories due to their different uses:
GB/T8162-1999 (Seamless steel tubes for structures). It is mainly used for general structures and mechanical structures. Its representative material (grade): carbon steel 20, 45 steel; Alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.
GB/T8163-1999 (Seamless Steel Tubes for Fluid Transport). It is mainly used for conveying fluid pipelines on engineering and large equipment. Representative materials (grades) are 20, Q345, etc.
GB3087-1999 (Seamless Steel Tubes for Low and Medium Pressure Boilers). It is mainly used for industrial boilers and domestic boilers to transport low and medium pressure fluids. The representative materials are 10 # and 20 # steel.
GB5310-1995 (Seamless Steel Tubes for High Pressure Boilers). It is mainly used for high temperature and high pressure transmission fluid header and pipeline of power plant and nuclear power plant boiler. Representative materials are 20G, 12Cr1MoVG, 15CrMoG, etc.
GB5312-1999 (Seamless Carbon and Carbon Manganese Steel Tubes for Ships). It is mainly used for Class I and II pressure pipes for marine boilers and superheaters. The representative materials are 360, 410, 460 steel grades, etc.
GB1479-2000 (Seamless Steel Pipe for High Pressure Fertilizer Equipment). It is mainly used for conveying high-temperature and high-pressure fluid pipelines on fertilizer equipment. Representative materials are 20, 16Mn, 12CrMo, 12Cr2Mo, etc.
GB9948-1988 (Seamless Steel Tubes for Petroleum Cracking). It is mainly used for boilers, heat exchangers and fluid transmission pipelines in oil refineries. The representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb, etc.
GB18248-2000 (Seamless steel tubes for gas cylinders). It is mainly used for making various gas and hydraulic cylinders. The representative materials are 37Mn, 34Mn2V, 35CrMo, etc.
GB/T17396-1998 (Hot rolled seamless steel tubes for hydraulic props). It is mainly used for making coal mine hydraulic supports, cylinders and columns, as well as other hydraulic cylinders and columns. The representative materials are 20, 45, 27SiMn, etc.
GB3093-1986 (High Pressure Seamless Steel Tubes for Diesel Engines). It is mainly used for high-pressure fuel pipe of diesel engine injection system. The steel pipe is generally cold drawn, and its representative material is 20A.
GB/T3639-1983 (Cold drawn or cold-rolled seamless steel tubes). It is mainly used for steel pipes with high dimensional accuracy and good surface finish for mechanical structures and carbon compression equipment. Its representative materials are 20, 45 steel, etc.
GB/T3094-1986 (Cold drawn Seamless Steel Tubes and Shaped Steel Tubes). It is mainly used to make various structural parts and components, which are made of high-quality carbon structural steel and low alloy structural steel.
GB/T8713-1988 (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 inner diameter for hydraulic and pneumatic cylinders. The representative materials are 20, 45 steel, etc.
GB13296-1991 (Seamless Stainless Steel Tubes for Boilers and Heat Exchangers). It is mainly used for boilers, superheaters, heat exchangers, condensers, catalytic tubes, etc. in chemical enterprises. High temperature, high pressure and corrosion resistant steel pipes are used. The representative materials are 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc.
GB/T14975-1994 (Stainless steel seamless steel tubes for structures). It is mainly used for atmospheric and acid corrosion resistant steel pipes with strength for general structures (hotels, hotel decoration) and mechanical structures of chemical enterprises. The representative materials are 0-3Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc.
GB/T14976-1994 (Seamless
Stainless Steel Pipe for Fluid Transport). It is mainly used to transport corrosive media. Representative materials are 0Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr17Ni12Mo2, 0Cr18Ni12Mo2Ti, etc.
YB/T5035-1993 (Seamless Steel Pipe for Automobile Half Axle Sleeve). It is mainly used to make high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel tubes for automobile half axle sleeves and axle tubes of drive axle housing. The representative materials are 45, 45Mn2, 40Cr, 20CrNi3A, etc.
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