Brinell to Rockwell C Hardness conversion
Brinell to Rockwell C Hardness conversion
(OP)
Hi,
Having a slight problem in getting a conversion of 305 BHN to Rockwell C, I have been through the many tables specified (i.e Zues book etc) and have managed to obtain a conversion from 301 BHN to 32 Rc, all tables seem to give between 301 and 311 BHN is there a recognised method to obtain 305?
Any help appreciated
Info:
Material is a Low alloy steel
cheers
Deakp
Having a slight problem in getting a conversion of 305 BHN to Rockwell C, I have been through the many tables specified (i.e Zues book etc) and have managed to obtain a conversion from 301 BHN to 32 Rc, all tables seem to give between 301 and 311 BHN is there a recognised method to obtain 305?
Any help appreciated
Info:
Material is a Low alloy steel
cheers
Deakp





RE: Brinell to Rockwell C Hardness conversion
Any google search for "hardness conversion" will get you many results.
RE: Brinell to Rockwell C Hardness conversion
RE: Brinell to Rockwell C Hardness conversion
RE: Brinell to Rockwell C Hardness conversion
SAE J417 HARDNESS TESTS AND HARDNESS NUMBER CONVERSIONS shows 303 HBW (10 mm tungsten carbide ball with 3000 kg force) is equal to 32.2 HRC. It also shows 313 HBW is equal to 33.3 HRC. You could assume a linear response between these two values and state that 305 HBW is approximately equal to 32.4 HRC.
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Brinell to Rockwell C Hardness conversion
deakp
RE: Brinell to Rockwell C Hardness conversion
This includes hardness unit conversion and the value is matching with the above specified value.
Regards,
RE: Brinell to Rockwell C Hardness conversion
Cheers for the info, downloaded the convertor top notch, better than the Dinosaur program i am curently using. again cheers
deaksp
RE: Brinell to Rockwell C Hardness conversion
We tested on every machine in house in every range/scale used. We also have a couple of local labs test as well.
These coversions are at least 10 HB different than you would get from standard tables (even using the correct alloy ones).
If this is important to you, you should have some testing done.
You should also remember to run a gage study on your hardness testers. You might be surprized at how much variation there is in readings.
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Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm
RE: Brinell to Rockwell C Hardness conversion
Hardness is better defined in ranges than in single values.
The same hardness reference block (homogeneous by definition) tested by different laboratories will give ranges of results, hopefully overlapping, not the kind of accuracy one can expect in the measuring of physical properties.
Furthermore each method is preferred for definite materials and conditions.
Brinell, covering a relatively extended area, provides some sort of surface hardness average.
Rockwell C is pointed to the tip of the diamond indenter and is suitable for more homogeneous structures.
Looking for decimal figures in Rockwell C would require equipment and procedures to be found only in national laboratories.
http://www.welding-advisers.com/