When the operating temperature of SA516 GR70 is 427℃, what should be considered in the design?
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Whether it is necessary to limit the carbon content, whether to use normalizing plates, whether to require heat treatment, whether to preheat before welding, etc. Ask everyone for advice!
The temperature is so high, can you consider using other materials? High temperature resistant, such as CrMo steel? At least I think it is necessary to conduct high-temperature tensile tests on the materials to verify the mechanical properties at the design temperature.
I agree with the suggestion above, it is best to change the material. The material used by the poster is ASME material which is equivalent to 16MnR. You should also pay attention to the tendency of graphitization.