Re: [MW:18556] why ferrite measurement is always cheking prior PWHT.

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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