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Reliable Hardness method on equipments

Reliable Hardness method on equipments

Reliable Hardness method on equipments

(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 & subsequent tensile value also above the min required.
So my conclusion is that portable hardness tester is not reliable.

Can anybody suggest the reliable hardness measurement on equipment?

RE: Reliable Hardness method on equipments

Microdur portable hardness tester.  I is semi automated, has a magnetic base for reliable readings and can be attached to a printer for hard copy results.

RE: Reliable Hardness method on equipments

(OP)
MikeMet,
How much it costs, where i could get it?

RE: Reliable Hardness method on equipments

I don't think the Equotip is suitable for heat-affected zones.  The Microdur is OK, provided you have sufficient thickness that material stiffness/vibration is not an issue.   

RE: Reliable Hardness method on equipments

(OP)
Brimstoner,

As the hardness reading below 12 mm thickness are not reliable by using EQUIOTIP portable hardness tester. I have proposed customer that  we will put additional test piece of pipe in the PWHT cycle each time & will test it in test lab by conventional method.But customer came with question as "what about weld & HAZ hardness?".What should be the justifiable answer.
The test lab is also of same opinion that portable hardness method is not reliable below 12 mm & i always deal with thickness less than 12 mm.Please suggest the reliable method


   

RE: Reliable Hardness method on equipments

The equiotip is NEVER the same as the Brinell test. ALl has to do with surface finish.
We use a King brinell hardness tester or a pin brinell tester.
http://www.westportcorp.com/hardness/brinnell/KingBrinellPortable.htm

FYI
If you use a pin brinell tester, make sure to keep traceability on the pin material.

Petrotrim Services

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