Effect of PWHT on CS
Effect of PWHT on CS
(OP)
Does anyone know of the benefit of post weld heat treating a carbon steel vessel (the entire vessel) with regards to sulfide corrosion? If treated, will the vessel be more resistant? Would cladding with inconel 625 be better?
Thanks in advance,
Jamie
Thanks in advance,
Jamie





RE: Effect of PWHT on CS
What are your process conditions regarding exposure to sulfide? I can tell you that the two main benefits derived from PWHT of carbon steel are the reduction of residual stresses from welding, and the reduction of hardness in the base metal heat affected zone (HAZ).
If the corrosion process involves stress corrosion cracking or stress-assissted corrosion, PWHT would help to reduce suscetibility. Otherwise, PWHT would have no impact on general corrosion resistance of the vessel.
RE: Effect of PWHT on CS
RE: Effect of PWHT on CS
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/