Hardness Conversion: Vickers to Rockwell F
Hardness Conversion: Vickers to Rockwell F
(OP)
Hi all,
I have been asked to determine a supplier for copper crush washers for fluid transfer applications. Our hardness requirement is in Vickers, 30-50 HV, and one potential supplier stated that they can meet a max of 65 on the Rockwell F scale. I can not find any conversion chart or table online to compare these values, and I was hoping someone here can point me in the right direction or verify for me if 65HRF is within the 30-50 HV range. Thanks in advanced.
-VM
I have been asked to determine a supplier for copper crush washers for fluid transfer applications. Our hardness requirement is in Vickers, 30-50 HV, and one potential supplier stated that they can meet a max of 65 on the Rockwell F scale. I can not find any conversion chart or table online to compare these values, and I was hoping someone here can point me in the right direction or verify for me if 65HRF is within the 30-50 HV range. Thanks in advanced.
-VM





RE: Hardness Conversion: Vickers to Rockwell F
RE: Hardness Conversion: Vickers to Rockwell F
The data that blacksmith37 provided is for a cartridge brass alloy (70%Cu, 30%Zn). Data for unalloyed copper is in a different table and has the following conversions:
HV HRF
50 41.5
48 39
46 36
44 33.5
42 30.5
40 28
RE: Hardness Conversion: Vickers to Rockwell F
Also, shouldn't the supplier be able to make the conversions themselves? Looking at the values, if my supplier can reach up to 65 HRF max, it's well within the 30-50 HV range, so they should know not to exceed 41.5 HRF.
RE: Hardness Conversion: Vickers to Rockwell F
We have done correlations our selves and found the published values to be off >5 points. It is so dependent on alloy, surface condition, and hardness levels that we now only report native units.
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Plymouth Tube
RE: Hardness Conversion: Vickers to Rockwell F
RE: Hardness Conversion: Vickers to Rockwell F
Is it best to simply go with a supplier that can actually performs a Vickers test and meet the specified range as opposed to going with someone which would require hardness conversion?
I am fairly new and do not want to screw anything up. As you mentioned, >5 deviation can definitely cause in issue if converting.
RE: Hardness Conversion: Vickers to Rockwell F
The only real conversion method I trust is to do identical parts at the same time by different methods on good equipment.
Traditionally hardness equipment is under-maintained, especially the indenters.
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
RE: Hardness Conversion: Vickers to Rockwell F
Still I would add an app. to any converted hardness value. I think it is adequate for speehes, etc. to give an approximate idea but I do not think it would suffice in your application.
http://www.gordonengland.co.uk/hardness/hvconv.htm
Tom
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.