I am welding 4130 to A106B, over 1/2 " in thickness. 4130 would be considered P-4 as it is > .5% < 2% Cr. Table 331.1.1 calls for a PWHT @1300-1375. I was thinking that I would see some exception to the 1300 due to the carbon steel transformation temperature, but I don't. I know that I don't...
metengr, thanks for your reply ! What verbage in B31.3 exempts me from this. I've scrubbed the 331.1.1 table and the associated notes, I seem to have overlooked something ? Thanks for your time !