Seamless Steel Pipes can be divided into following types due to their different applications.

GB/T8162-1999

Structural seamless steel pipe. Mainly used in general structure and mechanical structure. Its representative material (brand number): Carbon steel No.20 and No.45; Alloy Steel Q345、20Cr、40Cr、20CrMo、30-35CrMo、42CrMo. Etc.

GB/T8163-1999

Seamless steel tubes for conveying fluids. It is mainly used for conveying fluid on engineering or large equipment. Its representative material (brand number): No.20, Q345.

GB3087-1999

Seamless steel tubes for low and medium pressure boilers. Mainly used for conveying low and medium pressure fluid in industrial boilers and domestic boilers. Its representative material (brand number): No.10 and No.20 Steel material.

GB5310-1995

Seamless steel tubes for high-pressure boilers. It is mainly used for high temperature and high-pressure resistant fluid collecting box and pipeline on the boiler of the power station and nuclear power station. Its representative material: 20G、12Cr1MoVG、15CrMoG. 

GB5312-1999

Seamless steel tubes of carbon steel and carbon-manganese steel for ships. It is mainly used in class I II pressure-resistant pipe for boiler and super-heater unit. Its representative material: Steel grade 360, 410, 460.

GB1479-2000

Seamless steel tubes for high-pressure fertilizer equipment. It is mainly used for conveying high temperature and high-pressure fluid pipeline on fertilizer equipment. The representative material is 20, 16Mn, 12CrMo, 12Cr2Mo, etc.

GB9948-1988

Seamless steel pipe for petroleum cracking process. It is mainly used in boiler, heat exchanger, and fluid pipeline of petroleum smelter. The representative material is 20、12CrMo、1Cr5Mo、1Cr19Ni11Nb.

GB18248-2000

Seamless steel tubes for gas cylinders. Mainly used for the production of various gas cylinders, hydraulic cylinders. The representative material: 37Mn、34Mn2V、35CrMo.

GB/T17396-1998

Hot-rolled seamless steel pipe for hydraulic pro. Mainly used for the production of coal mine hydraulic support and cylinder column, as well as other hydraulic cylinder columns. The representative material: No. 20、No. 45、27SiMn.

GB3093-1986

High-pressure seamless steel tubes for diesel engines. It is mainly used for high-pressure oil pipe of diesel fuel injection system. The steel tube is generally cold-drawn and its representative material is No. 20A.

GB/T3639-1983

Cold-drawn or cold-rolled precision seamless steel pipe. Mainly used for the mechanical structure, carbon pressure equipment. The steel pipe needs to up to the requirements of precision high size accuracy, good surface finish. Its representative material: No. 20 and No. 45 steel material and so on.

GB/T3094-1986

Cold-drawn seamless steel pipe with a special shape. Mainly used for the production of various structural parts and parts. Its material is high-quality carbon structural steel and low alloy structural steel.

GB/T8713-1988

Seamless steel tubes with a precise inner diameter for hydraulic and pneumatic cylinders. It is mainly used for the production of hydraulic and pneumatic cylinders with a precision inner diameter of cold-drawn or cold-rolled seamless steel tubes. Its representative material: No.20, No. 45 steel and so on.

GB13296-1991

Seamless stainless steel tubes for boiler and heat exchangers. It is mainly used in high temperature, high pressure and corrosion resistant steel tubes for boiler, superheater, heat exchanger, condenser and catalytic tubes in chemical enterprises. Its representative material: 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc.

GB/T14975-1994

Structural stainless steel seamless steel pipe. Mainly used for general structure (hotel decoration) and chemical enterprise mechanical structure of atmospheric acid corrosion resistance and a certain strength of steel pipe. Its representative material: 0-3cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, etc.

GB/T14976-1994

Seamless stainless steel pipe for fluid transport. Mainly used for conveying corrosive medium pipeline. The representative material: 0Cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0Cr17Ni12Mo2, 0cr18ni12mo2, etc.

YB/T5035-1993

Seamless steel pipe used for automobile axle shaft sleeve pipe. It is mainly used to make high quality hot rolled seamless steel tubes made from carbon structural steel and alloy structural steel for the semi-axle sleeve of automobile and axle shell shaft of the drive axle. Its representative material is 4545mn2, 40Cr, 20CrNi3A, etc.