Dear Tulaib
It is true that the PWHT temp should be lower than the tempering temperature. As we know that tempering is done to improve the properties of the material. so if PWHT is done at a temperature higher than tempering temperature then there are possibilities that the material may undergo change in the properties resulting in loss of mechanical strength.
From: thulaib arakkal <thulaibwelding@gmail.com>
To: materials-welding@googlegroups.com
Sent: Wed, 17 November, 2010 6:44:25 PM
Subject: [MW:8302] pwht
hi friends, in our contract specification it says, pwht temperature should be less than tempering temperature of the material (ASTM A335 GrP-11). why is this requirement. our P11 pipes have tempering temperature of 700 deg celsius ,and as per our WPS pwht temp is 720 deg celsius.. So is it okay to do pwht at 720 deg celsius. will there be any problem if PWHT temperature exceeds tempering temperature --
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It is true that the PWHT temp should be lower than the tempering temperature. As we know that tempering is done to improve the properties of the material. so if PWHT is done at a temperature higher than tempering temperature then there are possibilities that the material may undergo change in the properties resulting in loss of mechanical strength.
Regards
Thaksen
From: thulaib arakkal <thulaibwelding@gmail.com>
To: materials-welding@googlegroups.com
Sent: Wed, 17 November, 2010 6:44:25 PM
Subject: [MW:8302] pwht
hi friends, in our contract specification it says, pwht temperature should be less than tempering temperature of the material (ASTM A335 GrP-11). why is this requirement. our P11 pipes have tempering temperature of 700 deg celsius ,and as per our WPS pwht temp is 720 deg celsius.. So is it okay to do pwht at 720 deg celsius. will there be any problem if PWHT temperature exceeds tempering temperature --
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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