[MW:24216] Re: Hardness Of P-91 Material

pradip,

what basis u select 710C??

you neither mentioned any process nor consumable??

pl tell us what is Ni+Mn is more than 1.5??

@760C+/-14C for two hr should be done.


On Saturday, January 30, 2016 at 8:14:02 AM UTC+3, 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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