Seamless steel pipes for low and medium pressure boilers: used to manufacture various low and medium pressure boilers, superheated steam pipes, boiling water pipes, water-cooled wall pipes and superheated steam pipes, large smoke pipes, small smoke pipes and arch brick pipes for locomotive boilers, etc. Hot-rolled or cold-rolled (dialed) seamless steel pipes are made of high-quality carbon structural steel. Mainly made of No. 10 and No. 20 steel, in addition to ensuring the chemical composition and mechanical properties, hydrostatic tests, curling, flaring, flattening and other tests are required. Hot-rolled products are delivered in a hot-rolled state, and cold-rolled (rolled) products are delivered in a heat-treated state.
High-pressure boiler steel pipes: High-quality carbon structural steel, alloy structural steel and stainless heat-resistant steel seamless steel pipes are mainly used to manufacture steam boiler pipes of high pressure and above. These boiler pipes often work under high temperature and pressure. The pipe will also undergo oxidation and corrosion under the action of high-temperature flue gas and water vapor. Therefore, the steel pipe is required to have high lasting strength, high oxidation resistance, and good organizational stability. The steel grades used are: high-quality carbon structure Steel grades include 20G, 20MnG, 25MnG; alloy structural steel grades 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.; rusty and heat-resistant steel commonly used 1Cr18Ni9, 1Cr18Ni11Nb high-pressure boiler tubes in addition to ensuring chemical composition and mechanical properties , it is necessary to conduct hydraulic pressure test one by one, as well as expansion and flattening tests. Steel pipes are delivered in heat treated condition. In addition, there are also certain requirements for the microstructure, grain size, and decarburization layer of the finished steel pipe.
