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Reliable Hardness method

Reliable Hardness method

Reliable Hardness method

(OP)
I have checked hardness of equipment after PWHT with portable hardness tester(Equotip). The thickness of CS equipment(A106 Gr B/A105) was 9.53 mm & hardness of PM  was 110-115 BHN.
I thought that tensile property of equipment may have dropped down to its min requirement so I simulate a test piece.
The test piece was send to test lab for hardness check . surprisingly the hardness value were 135-140 BHN.
So my conclusion is that portable hardness tester is not reliable.

Can anybody suggest the reliable hardness measurement on equipment?  

RE: Reliable Hardness method

I'd say wrong forum-you want Metal and Metallurgy Forum- I saw similar thread with good reponses- try a search.  

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