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[MW:24317] Re: Hardness Of P-91 Material

By Materials & Welding
Dear Kumar,

Please do the PWHT By Induction heating method and keep the heating &cooling rate 80 -100 Deg C.Also do post heating for 4 hours.

Regards,
Afroz Shaikh

On Saturday, January 30, 2016 at 10:44:02 AM UTC+5:30, pradipsil 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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