GB 5310 HIGH PRESSURE BOILER ALLOY STEEL PIPE

  Standard No： GB 5310-2008  Seamless steel tubes and pipes for high pressure boiler  1.GB5310 20G seamless steel tube for high-pressure boiler. 20G steel pipe is GB/5310 national standard steel number (foreign corresponding brand: German ST45.8, Japanese STB42, United States SA106B), for the most commonly used steel tube steel tube, chemical composition and mechanical properties are basically the same as the 20 plate. The steel has certain strength at room temperature and high temperature, low carbon content, good plasticity and toughness, and its cold and hot forming and welding properties are good. Used for 20G steel pipes are mainly used for manufacturing high-pressure and higher parameter boiler tubes, low-temperature superheater, reheater, economizer and water wall. Chemical composition of 20G  (%) C Si Mn P S 0.17~0.24 0.17~0.37 0.35~0.65 ≤0.040 ≤0.040 Mechanical properties of 20G Yield strength Tensile strength