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Opinion for Hardness Testing

12/03/2015 11:35 AM

In my past I have used Wilson Rockwell brand to test hardness of hard steel. I need to purchase a hardness tester at my current work place and there are a lot of choices I was unaware of. Has anyone had experience with other testers such as Phase II, Starrett, Mitutoyo or any others that are good? I need to check Rc scale.

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#1

Re: Opinion for Hardness Testing

12/03/2015 2:40 PM

We have both Starrett and Mitutoyo. Both work very well.

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#2
In reply to #1

Re: Opinion for Hardness Testing

12/03/2015 2:44 PM

SHOCKHISCAN, Thank you for the reply

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#4
In reply to #2

Re: Opinion for Hardness Testing

12/04/2015 7:15 AM

I use an Equiotip hardness tester. Does not work well with thin gage material, but i need portable in my application.

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#3

Re: Opinion for Hardness Testing

12/03/2015 11:24 PM

I would be inclined to ask: "what tester and procedure has stood the test of time with your client(s)...?"

Hardness values are, for all intents and purposes, arbitrary numbers, for which there are no absolutes standards. Hardness is not a fundamental property of a material, but rather, a response to a particular test method, following a given procedure.

Uncertainties in hardness testing have been recognized within many segments of industry since shortly after such testing first came into being. A CoP (Code of Practice) was prepared (c 2000) within UNCERT, a project funded by the Standards, Measurement and Testing Programme (under SMT4-CT97-2195) to simplify the way in which uncertainties are evaluated.

The work performed (for example) by S.N. Petrenko, in the "20's (attempting to wipe the slate clean, of the disrepute surrounding Brinell hardness testing) was only half the battle, in THAT arena (of hardness testing). Google "ACTA IMEKO Sept 2014 Proposed definition for the Brinell hardness indentation edge".

Any hardness tester "worthy of its name" (for the type of test required) could give satisfactory results, if it is used according to an agreed-upon procedure, using agreed-upon calibration references (and, of course, used by personnel who are qualified to use same!)

Find the GUM document ("Guide to the expression of uncertainty in measurement": 5+ separate pdfs) and peruse the section on hardness testing. I guarantee that it will "open your eyes" to some potential pitfalls in your process, and keep you from appearing as a "ninnyhammer".

"Cheers", and best wishes.

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#5

Re: Opinion for Hardness Testing

12/04/2015 10:51 AM


We are using this one in the Lab. For field measurements EQUOTIP

Automatic Rockwell Hardness Starrett 3816

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#6

Re: Opinion for Hardness Testing

12/04/2015 11:15 AM

Thank you all for your input. So far it looks as if Starrett is popular. I am going to see what deal I can get on a Starrett.

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#7

Re: Opinion for Hardness Testing

12/07/2015 6:32 AM

The hardness test is extremely useful in material selection because it provides a hardness value which indicates how easily a material can be machined and how well the material will wear. Hardness testing is also valuable in making decisions about treatments and coatings.

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Users who posted comments:

Harvey Patterson (2); ndt-tom (1); SHOCKHISCAN (1); silver123 (1); texasron (1); Whitephone (1)

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