PWHT for sa 335 gr p91/22

[aws2004]

Dear expert,

Please I need the help, with the best PWHT for material dissimilar Sa 335 Gr P 91 and Sa 335 Gr P 22.

Because I've of the joint for PWHT, Dia: 12" X 25mm / 28" X 33mm.

Thanking very you much in advance.

Kindest regards.

Magalhães Julio

 

[normet]

See ASME VIII-1, UW-40(8)(d). You should use the PWHT of the material requiring the higher temperature

 

[metengr]

First off, this could be under B31.1 Piping Code. I would use a B6 (5Cr) filler metal and perform the PWHT at between 1380 to 1400 deg F. Ideally, the PWHT for the Grade 91 base material is critical and is usally performed at 1400 deg F.