It has to be before PWHT otherwise heat treatment itself can cause sigma phase embrittlement or 885 F embrittlement of austenitic stainless steels; chances of which increase with higher ferrite content. Therefore, in order to perform a heat treatment without having any possible embrittlement, a prior measurement of ferrite content is necessary.
Octane
On Sat, Aug 31, 2013 at 4:19 PM, mohd <mohd52100@gmail.com> wrote:
dear sir,
why ferrite measurement shall be taken before PWHT for 300-series steel.
regards,
mohd.
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