Friday, November 9, 2012

[MW:15876] FW: 15871] RE: 15865] Regarding hardness acceptance value for SA-335 P-91 material

Hi Kareem,
 
My earlier email missed the following texts (in red). Hope this would clarify your query.
 
Thanks.
 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist

Ontario, Canada.

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

 


From: pgoswami [mailto:pgoswami@quickclic.net]
Sent: Wednesday, November 07, 2012 10:27 PM
To: 'materials-welding@googlegroups.com'
Cc: 'kareemunsheikh@gmail.com'
Subject: RE: 15871] RE: 15865] Regarding hardness acceptance value for SA-335 P-91 material

Hi Kareem,
 
250 HB Max is  typical base material hardness requirement  (as per the ASTM specification mentioned below) 
 
 Ref, API Technical Report 938-B as fabricated & PWHT -ed hardness requirements  for WELD, HAZ   are as follows:-
  • Recommended maximum allowable hardness is 248 HBW for process plant and refinery applications and 275 -300 HBW for utility services.
  • Hardness testing is typically performed using portable Telebrinellerhardness tester or equivalent.
  • Welds failing the hardness test are typically re-heat treated (no more than 2 times) or removed, re-welded, heat treated and tested for hardness. 
Control of hardness for grade -91  depends a lot on the PWHT range adopted . However note PWHT in excess of tempering temperature may excessively soften the steel.
 
What'te the project technical specification requirements ??
 
Appreciate your response.
 
Thanks.
 
 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist

Ontario, Canada.

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

 

From: materials-welding@googlegroups.com on behalf of kareem
Sent: Tue 11/6/2012 7:31 AM
To: materials-welding@googlegroups.com
Subject: [MW:15865] Regarding hardness acceptance value for SA-335 P-91 material


Dear experts

As per ASME sec-II SA-335 P-91 material maximum hardness value 250HB. my doubt is how much hardness value accepted (minimum & maximum) for weld metal as well as HAZ.
if have any reference articles please send for me.


Thanks with regards

kareem

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