20G high pressure boiler pipe is a kind of seamless steel tube; 20G is the national standard steel of GB5310 (corresponding: ST45.8 in Germany, STB42 in Japan and SA106B in the United States). It is the most commonly used steel for boiler steel pipe. The chemical composition and mechanical properties of 20G steel are basically the same as those of 20# plates.

20G high pressure boiler pipe has good strength at room temperature and medium high temperature, low carbon content, good plasticity and toughness, good cold and hot forming and welding performance. 20G high pressure boiler pipe is mainly used for manufacturing high pressure and parameter boiler pipe fittings, superheater, reheater, economizer and water wall in low temperature section; For example, small diameter pipes are used as heating surface pipes with wall temperature ≤ 500℃, water wall pipes and economizer pipes, while large diameter pipes are used as steam pipes with wall temperature ≤ 450℃, header (economizer, water wall, low temperature superheater and reheater header), and pipeline accessories with medium temperature ≤ 450℃.