What are the materials of seamless pipes?

　　The materials of seamless pipe are: ordinary and high-quality carbon structural steel, low-alloy steel, alloy steel, stainless acid-resistant steel, etc.

　　Introduction of seamless  pipe material:

　　GB/T8162-1999 (seamless steel pipe for structure). Mainly used for general structure and mechanical structure. Its representative material (brand): carbon steel 20, 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.

　　GB/T8163-1999 (seamless steel pipe for conveying fluid). It is mainly used for conveying fluid pipelines in engineering and large-scale equipment. The representative material (grade) is 20, Q345, etc.

　　GB3087-1999 (seamless steel pipes for low and medium pressure boiler tubes). Mainly used for pipelines for conveying low and medium pressure fluids in industrial boilers and domestic boilers. The representative material is 10, 20 steel.

　　GB5310-1995 (seamless steel pipes for high pressure boilers). It is mainly used for high temperature and high pressure transport fluid headers and pipes on boilers in power plants and nuclear power plants. The representative materials are 20G, 12Cr1MoVG, 15CrMoG, etc.

　　GB5312-1999 (carbon steel and carbon-manganese steel seamless steel tubes for ships). Mainly used for Class I and II pressure-resistant pipes for marine boilers and superheaters. The representative material is 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. The representative materials are 20, 16Mn, 12CrMo, 12Cr2Mo, etc.

　　GB9948-1988 (seamless steel pipe for petroleum cracking). Mainly used in boilers, heat exchangers and their transmission fluid pipelines in petroleum smelters. Its representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb, etc.

　　GB18248-2000 (Seamless steel pipes for gas cylinders). Mainly used to make various gas and hydraulic cylinders. Its representative materials are 37Mn, 34Mn2V, 35CrMo and so on.

　　GB/T17396-1998 (hot-rolled seamless steel pipes 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 engine). Mainly used for high pressure oil pipe of diesel engine injection system. 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 for mechanical structures and carbon pressing equipment that require high dimensional accuracy and good surface finish. It represents material 20, 45 steel and so on.

　　GB/T3094-1986 (cold drawn seamless steel pipe 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 make cold-drawn or cold-rolled seamless steel pipes with precise inner diameters for hydraulic and pneumatic cylinders. Its representative material is 20, 45 steel and so on.

　　GB13296-1991 (stainless steel seamless steel pipes for boilers and heat exchangers). Mainly used for boilers, superheaters, heat exchangers, condensers, catalytic tubes, etc. in chemical enterprises. High temperature, high pressure and corrosion resistant steel pipes. Its representative materials are 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc.

　　GB/T14975-1994 (Stainless Steel Seamless Steel Tube for Structural Use). Mainly used for general structure (hotel, restaurant decoration) and mechanical structure of chemical enterprises with resistance to atmosphere, acid corrosion and a certain strength of steel pipe. 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 conveying corrosive media. The representative materials are 0Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr17Ni12Mo2, 0Cr18Ni12Mo2Ti, etc.
　　The seamless pipe has a hollow section and is widely used as a pipeline for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, the steel pipe is lighter in weight when the bending and torsional strength is the same, and is an economical section steel. Different seamless pipe materials have different uses.