Your design code will most probably tell you this. Since you mentioned SA240, I assume your work is under one of the ASME BPV Sections, correct?
If true, have you looked up the applicable material notes (G, H, S, T and W) in section II-D?
Perhaps both 310 and 310H are possible, but one with restrictions, making it more appropriate to use the H-grade (thats what weve found over the years with similar materials).
If not, please tell us your applicable design code.
Section II-D can give some guidance in terms of allowables, but your very high operating temperature makes it a true high-temperature application, pointing to selecting H-grade material.
"Everyone is entitled to their own opinions, but they are not entitled to their own facts."
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RE: SA 240 310 and SA 240 310 H usage
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: SA 240 310 and SA 240 310 H usage
If true, have you looked up the applicable material notes (G, H, S, T and W) in section II-D?
Perhaps both 310 and 310H are possible, but one with restrictions, making it more appropriate to use the H-grade (thats what weve found over the years with similar materials).
If not, please tell us your applicable design code.
RE: SA 240 310 and SA 240 310 H usage
"Everyone is entitled to their own opinions, but they are not entitled to their own facts."