Hardness test and PWHT
Hardness test and PWHT
(OP)
Hi,
In my company we have a internat standard that recommends to do a hardness test after PWHT in the HAZ and in the weld, obviously to evalute the PWHT, but we have to compare these values with some standard value of maximum hardness after PWHT. I only found this kind of rereference in ASME B31.3 but not for P-number 1 materials which I'm interested in. Do you know any literature or standard where I could find this information?
Thanks a lot.
In my company we have a internat standard that recommends to do a hardness test after PWHT in the HAZ and in the weld, obviously to evalute the PWHT, but we have to compare these values with some standard value of maximum hardness after PWHT. I only found this kind of rereference in ASME B31.3 but not for P-number 1 materials which I'm interested in. Do you know any literature or standard where I could find this information?
Thanks a lot.





RE: Hardness test and PWHT
I don't know hardness limits related to this kind of requirement. However, in case this item must undergo NACE MR0103 or MR0175 prescriptions against Sulfide Stress Cracking (often refereed to as SSC), it is usually prescribed that hardness does not exceed 22 HRC (about 240 Brinell Hardness.)
Hope it helps.
Stefano
RE: Hardness test and PWHT
RE: Hardness test and PWHT
As a cautionary note even under service requirements for SCC, hardness testing of base metal heat affected zones in-situ is problematic. Instead, in-situ hardness testing is used for qualitative purposes, at best.
RE: Hardness test and PWHT
Petrotrim Services
www.petrotrim.com