Home » Seamless Precision Steel Tubes » Seamless steel Tubes-classification and use

Because of its different manufacturing process, but also divided into hot-rolled (extruded) seamless steel tube and cold (rolling) seamless steel pipe two kinds. Cold (rolling) tube is divided into round pipe and special-shaped tube.

A. Process overview

Hot-rolled (extruded seamless steel tube): round tube billet → heating → perforation → three-roll skew rolling, rolling or extrusion → off Tube → sizing (or reducing diameter) → cooling → billet Tube → straightening → hydraulic test (or flaw detection) → mark → storage.

Cold (rolled) seamless steel tube: round tube billet → heating → perforation → head → annealing → pickling → oil (copper plating) → multi-Channel cold drawing (cold rolling) → billet Tube → heat treatment → straightening → hydraulic test (flaw detection) → mark → storage.

b. Seamless steel tubes, because of their different uses are divided into the following several varieties:

$literal (structural seamless steel pipe). Mainly used in general structure and mechanical structure. Its representative material (brand): Carbon steel 20, 45th, Alloy Q345, 20Cr, 40Cr, 20CrMo, 30-35crmo, 42CrMo and so on.

$literal (seamless steel pipe for conveying fluids). Mainly used in engineering and large-scale equipment to transport fluid pipelines. Representative material (brand) is 20, Q345 and so on.

gb3087-1999 (Low medium pressure boiler seamless steel tube). Mainly used in industrial boilers and domestic boilers to transport low pressure fluid pipeline. The representative material is 10, 20th steel.

STD (High pressure boiler seamless steel tube). Mainly used in power plants and nuclear power plant boilers to withstand high temperature, high-pressure transport fluid container and pipeline. Representative materials for 20G, 12CR1MOVG, 15CrMoG and so on.

gb5312-1999 (carbon steel for ships and seamless steel tubes for carbon manganese steel). Mainly used in marine boilers and superheater I, ii pressure-resistant pipe and so on. Representative material is 360, 410, 460 steel grade and so on.

gb1479-2000 (high pressure fertilizer equipment with seamless steel pipe). It is mainly used for transporting high-temperature and high-pressure fluid pipelines on fertilizer equipment. Representative materials for 20, 16Mn, 12CrMo, 12cr2mo and so on.

gb9948-1988 (seamless steel pipe for petroleum cracking). It is mainly used in the boiler, heat exchanger and conveying fluid pipeline of petroleum smelting plant. Its representative material is 20, 12CrMo, 1cr5mo, 1cr19ni11nb and so on.

gb18248-2000 (cylinder with seamless steel tube). Mainly used for producing all kinds of gas, hydraulic cylinders. Its representative material is 37Mn, 34mn2v, 35CrMo and so on.

gb/t17396-1998 (Hot rolled seamless steel pipe for hydraulic prop). Mainly used in the production of coal mine hydraulic support and cylinder, column, and other hydraulic cylinders, columns. Its representative material is 20, 45, 27SiMn and so on.

gb3093-1986 (high pressure seamless steel pipe for diesel engine). Mainly used in diesel injection system high-pressure tubing. Its steel pipe is generally cold drawn pipe, its representative material is 20A.

gb/t3639-1983 (cold drawn or cold-rolled precision seamless steel tube). It is mainly used in mechanical structure, carbon pressure equipment, steel pipe with high dimension precision and good surface finish. Its representative material 20, 45 steel and so on.

gb/t3094-1986 (cold drawn seamless steel tube). Mainly used for the production of various structural parts and parts, the material is high-quality carbon structural steel and low alloy structural steel.

gb/t8713-1988 (hydraulic and pneumatic cylinder with precision inner diameter seamless steel pipe). Mainly used in the production of hydraulic and pneumatic cylinder with precision diameter of the cold drawn or cold-rolled seamless steel tube. Its representative material is 20, 45 steel and so on.

gb13296-1991 (stainless steel tubes for boilers and heat exchangers). Mainly used in chemical enterprises boilers, superheater, heat exchanger, condenser, catalytic tubes and so on. Used to withstand high temperature, high pressure, corrosion-resistant steel pipe. Its representative material is 0cr18ni9, 1Cr18Ni9Ti, 0cr18ni12mo2ti and so on.

gb/t14975-1994 (structural stainless steel seamless pipe). Mainly used in general structure (hotels, hotel decoration) and chemical enterprises mechanical structure for atmospheric, acid corrosion and have a certain strength of the steel pipe. Its representative material is 0-3cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0cr18ni12mo2ti and so on.

gb/t14976-1994 (stainless steel seamless pipe for fluid transportation). Mainly used to transport corrosive media pipelines. Representative material for 0cr13, 0Cr18Ni9, 1Cr18Ni9Ti, 0cr17ni12mo2, 0cr18ni12mo2ti and so on.

yb/t5035-1993 (seamless steel pipe for automotive half axle casing). It is mainly used for producing high quality carbon structural steel and alloy structural steel hot-rolled seamless pipe with axle casing and drive axle axle. Its representative material is 45, 45mn2, 40Cr, 20crni3a and so on.

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