High-pressure boiler tubes: 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 are designed to work under high temperature and pressure. , pipes will also undergo oxidation and corrosion under the action of high-temperature flue gas and water vapor. Therefore, steel pipes are required to have high lasting strength, high oxidation resistance, and good organizational stability. The steel grades used are: high-quality carbon Structural steel grades are 20G, 20MnG, 25MnG; alloy structural steel grades are 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.; rusty and heat-resistant steel commonly used 1Cr18Ni9, 1Cr18Ni11Nb high-pressure boiler tubes ensure chemical composition and mechanical properties. In addition, hydraulic pressure tests must be performed one by one, and expansion and flattening tests must be performed. 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. In addition to ensuring the chemical composition and mechanical properties, all steel pipes used to withstand fluid pressure must ensure that they pass the hydraulic pressure test. Various special steel pipes must be guaranteed according to regulations.
