I have recently performed an ASME code calculation (using software) on a pressure vessel. I thought that it was odd that the vessel would pass for 304 but not for 304L. This of course raised the question of what the difference is between the two at say 1150 degrees F. My question isn't really what the difference between them is, rather what are the properties of the dual rated version, and if there is such a clear dividing line of 0.03% carbon content, how can the material perform the function of both? Also, my purchasing manager has stated that he cannot find pure 304 anywhere, that we must use 304/L or go to a different # stainless, is this true?
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