Hi,
As per ASME Sec VIII Div I, PWHT requirement for high alloy steel,
P.No 6 Group no. 1, 2, & 3 has given PWHT.
But where as in case of P. No 6 group no. 4 PWHT has not been given
But as per ASTM A487/A487M-14; ASTM specification,
Intermediate PWHT given between 665 & 690, followed by
Final temper PWHT as 565 & 620.
So please clarify PWHT requirement for CA6NM gr. A&B (P.No 6 & Group No.4)
Regards,
Rakhul.