Dear all I wanna do PWHT for welding joint of material A335-P5 with bellow characteristic: wall thickness= 8 mm max pipe diameter = 2" & 4" we must do PWHT as soon as possible and I saw in ASME B31.3 that for P No.5 holding time is min 2 hr but I didnt see anything about time rating(increasing and cooling).I do PWHT with rating 150C/hr and hold it 2hr and after PWHT hardness was 140 HB . Is it possible that we increase rating temp. and decrease holding time? Please help me as soon as possible.
dear sir I read all paragraph of ASME B31.3 but I didnt see anything about heating and cooling rate in PWHT of alloy steel 5% Cr . I wanna know the best graph for PWHT.