Dear sir,
The maximum hardness value on the weldment/HAZ is not more than 250HB.The minimum hardess value is the base metal hardness value. The basemetal Hardness value is our reference for finding minimum hardness value .
The range as follows - minimum Hardness value value is base metal value and max value is not more than 250 HB (weldment and haz)
The range as follows - minimum Hardness value value is base metal value and max value is not more than 250 HB (weldment and haz)
best regards
Bijoy joseph
On Thu, Nov 8, 2012 at 8:57 AM, pgoswami <pgoswami@quickclic.net> wrote:
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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