GordonF
Materials
- Jul 3, 2002
- 16
Dear all
We have a steam turbine nozzle block that is made from a martensitic stainless steel (similar to 422). The nozzle assembly is fabricated from individual nozzles which are welded together. The weld material is a nickel based alloy believed to be Inconel 182.
We are currently investigating a repair of the nozzle assembly. My question arises to the reasons why a nickel based alloy was used in the fabrication, rather than a 410 martensitic stainless, bearing in mind it is possible to PWHT.
Any comments would be appreciated.
Regards
We have a steam turbine nozzle block that is made from a martensitic stainless steel (similar to 422). The nozzle assembly is fabricated from individual nozzles which are welded together. The weld material is a nickel based alloy believed to be Inconel 182.
We are currently investigating a repair of the nozzle assembly. My question arises to the reasons why a nickel based alloy was used in the fabrication, rather than a 410 martensitic stainless, bearing in mind it is possible to PWHT.
Any comments would be appreciated.
Regards
