[MW:15872] 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. Ref, API
Technical Report 938-B as fabricated & PWHT -ed hardness requirements 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 <blocked::mailto:Email-pgoswami@sympatico.ca> ,

pgoswami@quickclic.net <blocked::mailto: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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