Please advise on the design temperature of duplex stainless steel 2205 material
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According to Article 7.6.1 of "HG∕T 20581-2011 Material Selection Regulations for Steel Chemical Vessels", the use temperature of duplex stainless steel for pressure vessels is -20~300°C, but the minimum use temperature of ASME B31.3 can reach -60°C (-51°C). If I design a machine with a design temperature: For a shell-and-tube heat exchanger with a tube side of -40°C and a shell side of 90°C, can the tube side be made of 2205? Thank you! Picture 1: "HG∕T 20581-2011 Regulations on the Selection of Materials for Steel Chemical Containers" Regulation 7.6.1 Picture 2: ASME B31.3 2205 material minimum operating temperature
Which design standard do you use? When using that standard, you must follow the requirements of that standard and cannot piece together several standards.
Just look at the operating temperatures of A516 Gr70 and Q345R. There is still a big difference in material manufacturing levels. Standard setters need to consider the average level and demands of most manufacturers. Use whatever standard materials you use, and of course you have to consider the place of origin!
It is not recommended to use it near the lower operating temperature limit of the equipment, especially if the medium is hazardous chemicals
According to GB150.2, Article 4.2.6, austenite-ferrite dual-phase steel can only be used at -20°C. Obviously, it cannot be used in pipes. In addition, ASME materials have never directly stipulated the lower limit of use temperature, which is completely different from the logic of national standards.
Sir, one of the two standard temperature units is °C and the other is F°. It depends on whether you are designing according to solid solution or ASME design. We cannot generalize.