Seamless steel pipes are classified by use
GB / T3092-1993 low-pressure seamless steel pipes are divided into the following varieties according to their uses:
GB / T8162-2008 (seamless steel tube for structure). Mainly used for general structure and mechanical structure. Its representative materials (brands): carbon steel 20, 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.
GB / T8163-2008 (seamless steel pipe for conveying fluid). It is mainly used for conveying fluid pipelines on engineering and large equipment. The representative material (brand) is 20, Q345, etc.
GB3087-2008 (seamless steel tubes for low and medium pressure boilers). Mainly used in pipelines for industrial boilers and domestic boilers to transport low and medium pressure fluids. The representative material is 10 and 20 steel.
GB5310-2008 (Seamless steel tubes for high-pressure boilers). Mainly used for high temperature and high pressure transport fluid headers and pipelines on power station and nuclear power plant boilers. Representative materials are 20G, 12Cr1MoVG, 15CrMoG, etc.
GB5312-1999 (seamless carbon steel and carbon manganese steel seamless steel tubes). Mainly used for ship boiler and superheater I, II grade pressure pipes, etc. The representative materials are 360, 410, and 460 steel grades.
GB9948-1988 (Seamless steel pipe for oil cracking). Mainly used in oil smelter's boilers, heat exchangers and its fluid pipelines. Its representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb, etc.
GB18248-2000 (seamless steel tube for gas cylinder). Mainly used for making various gas and hydraulic cylinders. Its representative materials are 37Mn, 34Mn2V, 35CrMo and so on.
GB / T17396-1998 (Hot rolled seamless steel tubes for hydraulic props). Mainly used to make coal mine hydraulic supports and cylinders and columns, as well as other hydraulic cylinders and columns. Its representative materials are 20, 45, 27SiMn, etc.
GB3093-1986 (High-pressure seamless steel tubes for diesel engines). 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 precision seamless steel tubes). It is mainly used for mechanical structure and carbon pressure equipment, which requires high dimensional accuracy and good surface finish. Its representative material is 20, 45 steel, etc.
GB / T3094-1986 (cold-drawn seamless steel tube special-shaped steel tube). Mainly used for making various structural parts and components, the material is high-quality carbon structural steel and low alloy structural steel.
GB / T8713-1988 (precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders). Mainly used for making cold drawn or cold rolled seamless steel tubes with precise inner diameter for hydraulic and pneumatic cylinders. Its representative material is 20, 45 steel, etc.
GB13296-1991 (stainless steel seamless steel tubes for boilers and heat exchangers). It is mainly used in boilers, superheaters, heat exchangers, condensers and catalytic tubes of chemical enterprises. Used high temperature, high pressure, corrosion-resistant steel pipe. Its representative materials are 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti and so on.
GB / T14975-1994 (Stainless steel seamless steel tube for structure). Mainly used for general structure (hotel and restaurant decoration) and chemical enterprise mechanical structure with atmospheric and acid corrosion resistance and a certain strength of steel pipe. Its representative materials are 0-3Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti and so on.
GB / T14976-1994 (stainless steel seamless steel pipe for fluid transportation). Mainly used for pipelines that transport corrosive media. Representative materials are 0Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr17Ni12Mo2, 0Cr18Ni12Mo2Ti, etc.
YB / T5035-1993 (seamless steel pipe for automobile half shaft casing). It is mainly used to make high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel tubes for automobile half-shaft casing and drive axle housing axle tubes. Its representative materials are 45, 45Mn2, 40Cr, 20CrNi3A and so on.
API SPEC5CT-1999 (casing and tubing specifications), is compiled and published by the American Petroleum Institute (American Petreleum Instiute, referred to as "API") and is used worldwide. Among them: Casing: It extends from the ground surface into the well and serves as a liner of the well wall. The pipes are connected by couplings. The main materials are J55, N80, P110 and other steel grades, and C90, T95 and other steel grades resistant to hydrogen sulfide corrosion. Its low steel grade (J55, N80) can be welded steel pipe. 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 the whole. Its role is that the pumping unit transports the oil in the oil layer to the ground through the tubing. The main materials are J55, N80, P110, and C90, which is resistant to hydrogen sulfide corrosion, prepared and released by the American Petroleum Institute, and is used throughout the world.
Pipeline: It is used to transport oil, gas or water from the ground to the oil and gas industry enterprises through the pipeline. Line pipe includes two kinds of seamless and welded pipe, the pipe end has a flat end, a threaded end and a socket end; its connection method is end welding, coupling connection, socket connection and so on. The main material of the tube is B, X42, X56, X65, X70 and other steel grades.
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