Mike,
In B31.3 IX where the main concern is pressure I can see there is no difference between properties of A312 TP304L and A358 304L Cl1 and 3, providing that applicable notes are considered for procurement. In B31.1, their experience dealing with high temperatures of welded pipes ended with a different approach. It's hard to say there is a science behind, it's just the "Code".
You are right Mario, but I don't know what considerations B31.3 ch IX take, allowables from B31.3 Ch IX are higher than B31.3
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