Conversion from Vickers hardness to Rockwell C

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fujita yuji

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Jul 12, 2008
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Hi.
I've figured out a hardness conversion formula from Vickers to Rockwell C scale based on the table below.

http://www.buehler-asia.com/brochure/download-02_Hardness_Table_01.pdf

Here's the formula. Let x be vickers hardness value, then

-0.000054*x*x + 0.12*x + 2.67

will obtain Rockwell C scale value.

I'm not sure how much helpful this kind of tip is as it is quite hard to calculate with human hand (and brain).
Just for your information and I wish it helps you.
 
thanks for your replys.
but no. I mean not the chart.
It is a formula.
It may run on some type of pocket calculator (the one that has many push buttons above the digit keys).
 
I'm not trying to convert from vickers, but from Rockwell 45T to RC, I picked up an Ames model S tester with a 1/16 penetrater from ebay for a crazy low price of $136

So far I haven't been able to find a direct from 45T to RC chart, when I can swing the $450 for the diamond penetrater the conversion is easy from 45N to RC

With the chart you provided I have been able to go from 45T to RB to RC
 
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John Katt said:
I'm not trying to convert from vickers, but from Rockwell 45T to RC, I picked up an Ames model S tester with a 1/16 perpetrator from ebay for a crazy low price of $136

So far I haven't been able to find a direct from 45T to RC chart, when I can swing the $450 diamond perpetrator the conversion is easy from 45N to RC

With the chart you provided I have been able to go from 45T to RB to RC
Click to expand...

John try this site. There is a calculator below the first chart.

http://www.efunda.com/units/hardness/convert_hardness.cfm?HD=HR-45T&Cat=Steel#ConvInto
 
I don't know much about these things, but it seems that the 45T tester is meant for superficial testing of softer materials. The highest 45t goes to is 78, which doesn't even register on the Rockwell C scale.
 
The tester will test between 0 and 100 in both the N and T scale the N45 scale will convert directly to RC

I have 5 knives that I know are very hard and they test right at the upper limit 93 to 96 45T

After emailing with the ames tech, he said the N scale was the proper tester for thin metal 1/2 and thinner and that the t scale would give me a general idea how hard my blades are but with low accuracy

For now its all for fun, I am hoping that a diamond penetrater will pop up on ebay for cheap
 
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