Hi Kumar,
These readings are taken by portable hardness tester ?? Tele brinneler?? If these higher hardness reading are isolated, prepare the surface well to avoid any unevenness and retake the readings around the tested areas.
Isolated high readings may be ignored.
Hope this article would provide some guidance to this issue.
Thanks.
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Engineering Specialist ,
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Kumar
Sent: Friday, October 28, 2016 4:16 PM
To: materials-welding@googlegroups.com
Subject: [MW:25619] Hardness for vessel after PWHT
Dear experts,
In our project for pressure vessels, moc- SA 516 gr.70 N, shell thickness 55mm (nace MR 0175). After doing PWHT, hardness measured and most of readings found in limit.
According to procedure vessels having more than 50mm thick hardness value shall not exceed more than 225 (brinell for p no. 1). But some values are 228,230,18 etc.. could we get expert advise to adress this dis-parity pl.
Thanks in advance,
Kumar.
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