Is there a graph for HRC against true hardness?

N

Nsled

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May 13, 2019
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By "true hardness" i mean an actual linear scale as I believe HRC is somewhat logarithmic. For example so one can see how 55HRC actually compares to 60HRC in a more tangible sense.
 
The logarithmic comparison is with yield strength or tensile strength not with an unknown “true” hardness scale though perhaps some other scales would be more linear with strength like Vickers. However, any curve is linear over short enough differences. Over the general range of knife hardness (~55-65 Rc) the behavior is linear. If someone is claiming that the difference between 61 and 62 is much greater than 55 and 56 they are misunderstanding what’s going on.
 
" the difference between 61 and 62 is much greater than 55 and 56 they are misunderstanding what’s going on"

Not really what was meant, for example if it were linear 65hrc would be 108% the hardness of 60hrc, surely its much greater? What's the best way of seeing the actual comparative hardness?
 
Nsled said:
" the difference between 61 and 62 is much greater than 55 and 56 they are misunderstanding what’s going on"

Not really what was meant, for example if it were linear 65hrc would be 108% the hardness of 60hrc, surely its much greater? What's the best way of seeing the actual comparative hardness?
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Did you miss the part where he said it was linear? That's because it's linear rate not a rising rate.
 
Yes my last message was somewhat silly, I wasn't thinking of it in a way Larrin described. I did expect a larger difference between 61 and 62 then 55 and 56 but the scale of the difference is still very obscure to me. Knowing that Hrc is measured by pushing a ball into the steel it will get harder and harder to push through, but does the hrc measurement compensate for that at all?

So to clarify 65Hrc is in fact about 108% the hardness of 60Hrc...?
 
Steel ball hardness testing is only for softer hardness scales.
 
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