Alloy seamless steel pipe is a kind of seamless steel pipe, and its performance is much higher than that of ordinary seamless steel pipe, because this steel pipe contains more Cr, and its high temperature resistance, low temperature resistance and corrosion resistance performance are better than other seamless steel pipes. Incomparable, so alloy tubes are widely used in petroleum, chemical, electric power, boiler and other industries. Alloy seamless steel tube (Seamless Steel Tube) has a hollow section, a long steel strip without joints around it. The steel 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, alloy seamless steel pipe has the same flexural and torsional strength and lighter weight. It is an economical section steel and is widely used in the manufacture of structural parts and mechanical parts, such as oil transportation. Making ring parts with alloy seamless steel pipe can improve the utilization rate of materials, simplify the manufacturing process, save materials and processing time, such as rolling bearing rings, jack sets, etc., which have been widely used in steel pipe manufacturing. Alloy seamless steel pipe is also an indispensable material for various conventional weapons, and the barrel, barrel, etc. must be made of steel pipe. In addition, when the ring section is subjected to internal or external radial pressure, the force is relatively uniform. Therefore, most alloy seamless steel pipes are round pipes.
Classification:
Structural seamless steel pipe: 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 conveying fluids: mainly used for conveying fluid pipelines in engineering and large-scale equipment. The representative material (grade) is 20, Q345, etc.
Seamless steel pipes for low and medium pressure boilers: mainly used for pipelines for conveying low and medium pressure fluids in industrial boilers and domestic boilers. The representative material is 10, 20 steel.
Seamless steel pipes for high pressure boilers: 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.
Seamless steel pipes for high-pressure fertilizer equipment: mainly used for high-temperature and high-pressure fluid pipelines on fertilizer equipment. The representative materials are 20, 16Mn, 12CrMo, 12Cr2Mo, etc.
Seamless steel pipes for oil cracking: mainly used in boilers, heat exchangers and their transmission fluid pipelines in oil smelters. Its representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb, etc.
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.
Hot-rolled seamless steel pipes for hydraulic props: mainly used for making 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 pipe: mainly used for mechanical structure, carbon pressing equipment, requiring high dimensional accuracy and good surface finish. Its representative material is 20, 45 steel, etc.
Alloy tube material
12Cr1MoV, P22 (10CrMo910) T91, P91, P9, T9, WB36, Cr5Mo (P5, STFA25, T5, )15CrMo (P11, P12, STFA22), 13CrMo44, Cr5Mo, 15CrMo, 25CrMo, 30CrMo, 40CrMo.
National implementation standards DIN17175-79,  GB5310-2008, GB9948-2006, ASTMA335/A335m, ASTMA213/A213m.