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.