Re: [MW:24189] Hardness Of P-91 Material

Dear Mr.Kumar

Normally 760 C with 4 hours holding time required to get a hardness value.But always follow your WPS requirements and client specifications. 

Thanks & Regards

Nareshkumar Subramanian

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From: Mohammad Saquib <saquibqaqc@gmail.com>
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Sent: Saturday, January 30, 2016 9:20 AM
Subject: Re: [MW:24188] Hardness Of P-91 Material

Dear Kumar,
you have to do re PWHT 2 hours holding time at 725 degree centrigrade  make sure the heating & cooling rate is not more than 100 degree

On Sat, Jan 30, 2016 at 7:59 AM, pradip kumar Sil <pradipsil@gmail.com> wrote:

Dear Everybody,

Some of our P-91 Joints( Weldment) are coming hardness value around 300HB in the HRSG Unit.

 Joints thickness is 18 mm & 20 mm & we did PWHT 2 hours holding time at 710 degree centrigrade also we did 150 degree heating rate ,120 degree cooling rate.

Can you pls suggest us this hardness value  is acceptable in the HRSG unit. If not pls suggest me how to recover.

Regards,

Kumar

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