Re: [MW:24192] Hardness Of P-91 Material

Here temp is 2- 3 degree centrigrade...... After PWHT next day we exposed all joints open atmosphere.

Is any effect to increase the hardness.

Pls advice me

On Sat, Jan 30, 2016 at 5:12 PM, Mansukh Satashiya <satashiyam@gmail.com> wrote:

Dear friend
Do heating and cooling rate 60 degree per hour and do proper booth preparation with teen sheet and do not open up to 24 hours after pwht complete
We are doing 52 mm thick p91 joints
Mansukh Satashiya

On Jan 30, 2016 10:43 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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