Hot-rolled seamless steel pipe

Purpose: Seamless steel pipe can be divided into thick wall seamless steel pipe and thin wall seamless steel pipe according to different purposes. Seamless steel pipes are widely used.

1. Seamless steel pipes for general purposes are rolled from ordinary carbon structural steel, low alloy structural steel or alloy structural steel according to the material. For example, seamless pipes made of low carbon steel such as No. 10 and No. 20 are mainly used as transmission pipelines for steam, gas, liquefied gas, natural gas, various petroleum products and various other gases or liquids; Seamless pipes made of medium carbon steel such as 45 and 40Cr are mainly used to manufacture various machine parts and pipe fittings.

2. Seamless steel pipes for general purposes are also supplied according to chemical composition and mechanical properties, as well as hydraulic test. Seamless steel pipes under fluid pressure shall be qualified in the hydraulic test.

3. Seamless pipes for special purposes are used for boilers, geological exploration, bearings, acid-resistant, etc. Such as petroleum geological drilling pipe, cracking pipe for petrochemical industry, boiler pipe, bearing pipe and high-precision structural steel pipe for automobiles, tractors and aviation.

Seamless steel pipe for structure is 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.

Seamless steel pipes for fluid transmission are mainly used in engineering and large equipment. The representative materials (brands) are 20, Q345, etc.

Seamless steel pipes for low and medium pressure boilers are mainly used for industrial boilers and domestic boilers to transport low and medium pressure fluids. The representative material is No. 10 and 20 steel.

Seamless steel pipes for high-pressure boilers are mainly used for high-temperature and high-pressure transmission fluid headers and pipes in power plants and nuclear power plants. The representative materials are 20G, 12Cr1MoVG, 15CrMoG, etc.

Carbon steel and carbon manganese steel seamless steel pipes for ships are mainly used for Class I and II pressure pipes for marine boilers and superheaters. The representative materials are 360, 410, 460 steel grades, etc.

Seamless steel pipes for high-pressure fertilizer equipment are mainly used for transporting high-temperature and high-pressure fluid pipes on fertilizer equipment. The representative materials are 20, 16Mn, 12CrMo, 12Cr2Mo, etc.

Seamless steel pipes for petroleum cracking are mainly used for boilers, heat exchangers and fluid pipelines in oil refineries. Its representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb, etc.

Seamless steel pipes are mainly used for making various gas and hydraulic cylinders. Its representative materials are 37Mn, 34Mn2V, 35CrMo, etc.

Hot rolled seamless steel pipes are used for hydraulic props, which are 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.

High-pressure seamless steel pipe for diesel engine is mainly used for high-pressure oil pipe of diesel engine injection system. The steel pipe is generally cold-drawn, and its representative material is 20A.

Cold-drawn or cold-rolled precision seamless steel pipes are mainly used for steel pipes with high dimensional accuracy and good surface finish for mechanical structures and carbon compression equipment. It represents 20, 45 steel, etc.