Due to different manufacturing processes, seamless steel tubes are divided into hot-rolled (kneading) seamless steel tubes and cold drawn (rolled) seamless steel tubes. The cold-drawn (rolled) tubes of butt-welded elbows are divided into round tubes and Shaped tube two. Hot-rolled seamless steel pipe (kneading seamless steel pipe): round tube blank → heating → perforation → three-roll cross-rolling, continuous rolling or kneading → pipe removal → sizing (or reducing diameter) → cooling → Blank tube → straightening → hydraulic test (or flaw detection) → logo mark → storage.seamless steel pipe manufacturer
The key is used for the same daily negotiating machine structure. Its representative material (signature): carbon steel 20, 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc. Key for engineering and years old Type equipment and equipment are arranged on the transport fluid pipeline. The representative material (signature) is 20, Q345, etc. The high pressure flange is mainly used for the wealth boiler and the boiler to transport the low and medium pressure fluid. The representative material is 10, 20 steel.
The flat welding flange is mainly used for high temperature and high pressure transportation of fluid collecting boxes and pipelines on power stations and nuclear power plant boilers. The representative materials are 20G, 12Cr1MoVG, 15CrMoG, etc. The key is used for I, II pressure pipes for ship boilers and superheaters. The representative material is 360, 410, 460 steel grade and other key used in fertilizer equipment and equipment to transport high temperature and high pressure fluid pipeline. Representative materials are 20, 16Mn, 12CrMo, 12Cr2Mo and so on.1 1 4 schedule 40 stainless steel pipe supplier
The key is used in boilers of oil smelters, thermal communicators and their transport fluid pipelines. The representative materials are 20,12CrMo, 1Cr5Mo, 1Cr19Ni11Nb, etc. The key is to create various gas and hydraulic cylinders. The representative materials are 37Mn, 34Mn2V. , 35CrMo, etc. The key is to create coal mine hydraulic supports and cylinders, columns, and other hydraulic cylinders, columns. The representative material is 20, 45, 27SiMn and so on.