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Re: [MW:15760] RE: 15748] Regarding p91 intermediate cooling

By Materials & Welding

That's right Pradip, lets always keep basic metallurgy in mind

best regards

Dr. Georgios Dilintas

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"pgoswami" <pgoswami@quickclic.net>


    "pgoswami" <pgoswami@quickclic.net> 
    Sent by: materials-welding@googlegroups.com

    25/10/2012 02:25

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    [MW:15758] RE: 15748] Regarding p91 intermediate cooling

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Hi Govindaraju,
 
This temperature corresponds to the Martensite finish temperature for this steel.Grade-91 is thorough hardening steel and produces martesite on air cooling. The best room temperature mechanical properties (tensile, impact and hardness) for this steel  and the best high temperature creep properties are achieved when this steel is in fully tempered martensitic condition, i.e tempered @ 740-780 Deg C, following welding
 
Cooling to this temperature ,80c-110C  immediately following welding  but prior to PWHT is strongly advisable.
 
Thanks.
 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist

Ontario, Canada.

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of GOVINDARAJU RAJU
Sent: Tuesday, October 23, 2012 4:43 AM
To: materials-welding@googlegroups.com
Subject: [MW:15748] Reagrdin p91 intermediate cooling

Dear sir
 I am doing qc engineer in power plant construction.I have doubt regarding P91 welding.After completion of welding, we are doing intermediate cooling at 80c-110C.What is the  need of intemediate cooling?
 
Rgds
V.GOVINDARAJU
 

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