Hi Ghrab,
B-31.1 does not make hardness testing as a mandatory requirement, as the process fluid is "steam", which is relatively non-corrosive.However over the years many many CSEF(Creep Strength Enhanced Ferritic) steels have been adopted by the code, such as P-91 , P-92 etc. Following performing welding and PWHT for grade steel hardness testing should be done. Often this(hardness ) requirement is specified in project specifications. The advisable range is: Min 200 VHN, Max -270 VHN.
You may find the following articles as useful explaining why hardness testing is required for grade-91 welds.
Note :- Grade-91 is not like P-11,P22, unless proper and detailed welding engineering is done upfront, you may have recurring problems.
Thanks
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
- http://www.lincolnelectric.com/en-us/industries/Documents/P91_and_Beyond.pdf
- http://www.sperkoengineering.com/html/Grade%2091%20R%208-12.pdf
- http://files.aws.org/wj/2006/06/wj200606/wj0606-42.pdf
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Zakaria ghrab
Sent: Monday, September 17, 2012 3:14 AM
To: materials-welding@googlegroups.com
Cc: zakaria ghrab
Subject: [MW:15323] Alloy Material Hardness
Sent: Monday, September 17, 2012 3:14 AM
To: materials-welding@googlegroups.com
Cc: zakaria ghrab
Subject: [MW:15323] Alloy Material Hardness
Dear experts,
We're going to construct a new power station; according ASME sect B31.1.
We have many alloy steels (Grades P11, P91, P22 material) welded joints. Even when PWHT is performed, our client say that we don't have to perform hardness test.
Even NDE is the client scope, i'm searching for support from code to have exact infiormation, uis it mandatory ?
Need your help.
Regards.
--
SDEM Entreprises
-- We're going to construct a new power station; according ASME sect B31.1.
We have many alloy steels (Grades P11, P91, P22 material) welded joints. Even when PWHT is performed, our client say that we don't have to perform hardness test.
Even NDE is the client scope, i'm searching for support from code to have exact infiormation, uis it mandatory ?
Need your help.
Regards.
--
زكرياء غراب
GHRAB Zakaria
Site QA/QC ManagerGHRAB Zakaria
SDEM Entreprises
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