A516 Gr 70 pressure vessel steel sheet vs A572 Grade 50 steel

P265GH grade to EN10028-2 is a non-alloy quality steel with high temperature performance. The number: 1.0425. It has good plasticity, toughness, cold bending performance and welding performance. P265GH is an executive standard of the European standard boiler vessel plate is EN10028, European pressure vessel steel plate standard 265GH, and the corresponding domestic brand is 25MnG. 25MnG is a seamless steel pipe for GB 5310-2008 high pressure boiler.

20G steel is boiler steel, which is similar to No. 20 carbon steel. The difference is that 20G steel has higher and stricter inspection standards than A516 Gr 70 pressure vessel steel sheet, No. 20 carbon steel for harmful impurities and internal defects. That is to say, 20G steel is specially produced for boiler pressure vessels. It is special purpose "No. 20 carbon steel". The use of 20G steel to make boilers is not because it is more resistant to burning than other steels such as A516 Gr 70 pressure vessel steel sheet, but because of its strength, toughness, ductility, weldability, temperature influence, fatigue fracture, price and cost, etc. 20G steel is most suitable for use in medium and low pressure boilers.

A516 Gr 70 pressure vessel steel sheet annealing is to heat the steel to 30 ~ 50℃ above the critical temperature, keep it in the heat treatment furnace for a period of time, and then cool it down to room temperature with the furnace. The purpose of A516 Gr 70 pressure vessel steel sheet annealing is to refine the grain of steel, eliminate internal stress and reduce hardness, improve cutting performance, increase toughness and plasticity, and facilitate welding and rolling processes. A516 Gr 70 pressure vessel steel sheet annealing can be complete annealing, incomplete annealing, stress relief annealing, isothermal annealing and spheroidizing annealing.

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