Seamless steel pipes are widely used. According to different uses, there are thick-walled seamless steel pipes and thin-walled seamless steel pipes.
1. General purpose seamless steel pipes 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 10# and 20# are mainly used as transportation pipelines for steam, coal gas, liquefied gas, natural gas, various petroleum products and various other gases or liquids; medium carbon steel such as 45 and 40Cr The seamless pipes manufactured 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, and according to hydraulic test. Seamless steel pipes that bear fluid pressure must pass the hydraulic pressure test.
3. Special-purpose seamless pipes are used in boilers, geological exploration, bearings, acid resistance, etc. Such as petroleum geological drilling pipes, cracking pipes for petrochemical industry, boiler pipes, bearing pipes and high-precision structural steel pipes for automobiles, tractors and aviation.
Structural seamless steel pipes are mainly used for general structures and mechanical structures. Its representative materials (grades): carbon steel No. 20, No. 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.
Seamless steel pipes for transporting fluids are mainly used for transporting fluid pipelines in engineering and large-scale equipment. Representative materials (grades) are 20, Q345, etc.
Seamless steel pipes for low and medium pressure boilers are mainly used for pipelines transporting low and medium pressure fluids in industrial boilers and domestic boilers. The representative materials are No. 10 and 20# steel.
Seamless steel pipes for high-pressure boilers are mainly used for high-temperature and high-pressure fluid transport headers and pipes in power plant and nuclear power plant boilers. Representative materials are 20G, 12Cr1MoVG, 15CrMoG, etc.
Seamless steel pipes for high-pressure fertilizer equipment are mainly used to transport high-temperature and high-pressure fluid pipelines on fertilizer equipment. Representative materials are 20, 16Mn, 12CrMo, 12Cr2Mo, etc.
Seamless steel pipes for petroleum cracking are mainly used in boilers, heat exchangers and fluid transport pipelines in petroleum smelting plants. Its representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb, etc.
Seamless steel pipes for gas cylinders are mainly used to make various gas and hydraulic gas 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.
Cold-drawn or cold-rolled precision seamless steel pipes are mainly used for mechanical structures and carbon pressing equipment, requiring high dimensional accuracy and good surface finish. Its representative materials include 20, 45 steel, etc.
Cold-drawn seamless steel pipes and special-shaped steel pipes are mainly used to make various structural parts and parts. They are made of high-quality carbon structural steel and low-alloy structural steel.
Precision inner diameter seamless steel pipes for hydraulic and pneumatic cylinders are mainly used to make cold-drawn or cold-rolled seamless steel pipes with precision inner diameters for hydraulic and pneumatic cylinders. Its representative materials are 20, 45 steel, etc.