I am in the situation where our supplier is short on SAE J429 grade 5. Looking to see if SAE J249 grade 8 will comply with ASME B31.3 process piping. Flange connections are 4, 6 & 8".
Have you looked in B31.3? If you don't have a copy, how can you confirm what I -- or anyone else -- tells you?
I did some searches in B31.3 for SAE J429, then just J429, ... Nope, that material is not found.
I can't necessarily confirm tothepoint's recommendation (B31.3 says ASTM 193 is for High Temperature or High Pressure Service and Other Special Purpose Applications) and I don't know enough about your application to make a recommendation.
But circling back to my first point -- you're the engineer. If the part fails, what are you going to tell your management, your customer, the judge (if there's a lawsuit) -- somebody on the Internet told me it was ok?
Patricia Lougheed
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