T91 arc strikes

Date 03-23-2012 00:07

If there is a corrosive agent involved with this metal, it is possible, that the arc strike could be a point of attack by the corrosive if PWHT is not applied.

By fschweighardt (***)

Date 03-23-2012 01:36

T91 or P91

By js55

Date 03-23-2012 12:40

T91 is one of those alloys that WILL form martensite with arc strikes. And this WILL embrittle the material. And it WILL form microfissures on the surface. And it WILL become a site susceptible to stress corrosion cracking. Grade 91, of any product form needs to be stress relieved after any kind of welding regime including arc strikes.

By fschweighardt (***)

Date 03-23-2012 19:08

NOt that it mattered what product form, but that rapid quench from an arc strike is a giant no-no. It would be hard for me to justify signing off on some kind of PWHT spot repair if it has been an extended period of time after the arc strike.