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welding of martensitic SS steam turbine nozzles

thread593-31487

welding of martensitic SS steam turbine nozzles

welding of martensitic SS steam turbine nozzles

(OP)
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
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