preheat & PWHT should be carried out based on the approved WPS. chart of preheat & PWHT should be in a continuous chart.
On Tuesday, February 2, 2016 1:39 PM, elias jarjoura <elias-jarjoura@hotmail.com> wrote:
Pre-heat and PWHT as per approved or adopted PQR and WPS.
Date: Sat, 30 Jan 2016 09:59:36 +0500
Subject: [MW:24187] Hardness Of P-91 Material
From: pradipsil@gmail.com
To: materials-welding@googlegroups.com
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Date: Sat, 30 Jan 2016 09:59:36 +0500
Subject: [MW:24187] Hardness Of P-91 Material
From: pradipsil@gmail.com
To: materials-welding@googlegroups.com
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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