Time to run a new PQR, Yippee! Working with SA335, Gr. P11 which is an ASME Section IX P4 base metal; 1.25% chrome, 0.5Mo material. Coupon in this case is actually going to be a 16" pipe, Schedule 80 (0.844" thick).
So, what are some thoughts on preheat? I know I'll have to do PWHT to 1150 - 1250 but I'm more interested in preheat at the moment for control of cracking.