1. GB/T8162-1999 seamless steel pipe for structure, mainly used for general structure and mechanical structure. Its representative material: carbon steel 20, 45 steel; Alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35crmo, 42CrMo, etc.
2. GB/T8163-1999 seamless steel pipe for fluid transportation. It is mainly used in engineering and large equipment to transport fluid pipeline. Representative materials are 20, 345, etc.
3. GB3087-1999 seamless steel pipe for low and medium pressure boiler. It is mainly used for industrial boilers and domestic boilers to transport low and medium pressure fluid pipes. The representative materials are 10 and 20 steel.
4. GB5310-1995 seamless steel pipe for high pressure boiler. It is mainly used for high-temperature and high-pressure transmission fluid header and pipeline in power plant and nuclear power plant boiler. The representative materials are 20g, 12Cr1MoVG, 15CrMoG, etc.
5. GB 5312-1999 seamless steel pipes of carbon steel and carbon manganese steel for ships. It is mainly used for class I and II pressure pipes of marine boilers and superheaters. The representative materials are grade 360, 410, 460 steel, etc.
6. GB 1479-2000 seamless steel pipe for high pressure fertilizer equipment. It is mainly used for transporting high temperature and high pressure fluid pipeline on fertilizer equipment. The representative materials are 20, 16Mn, 12CrMo, 12cr2mo, etc.
