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Subject: Brinell Hardness Abbreviation Designation.

 

Question:

BHN or HBW? Why do I see Brinell Hardness records with these different abbreviations?

Answer:

BHN has seen years of use as the designated abbreviation for Brinell Hardness Number, usually used in documents specifying or certifying hardness tests, the abbreviation followed by the number value, e.g. BHN 217.

ASTM has changed the standard for Brinell tests, now requiring the use of a carbide indention ball for all tests using a 3000 kg load (steel balls no longer allowed).

ASTM changed the abbreviation written with the hardness value number to HBW to indicate positively that the tester utilized a carbide ball. ASTM has made small adjustments to the hardness number charts to account for the change in balls.   

For more on this subject, see http://www.woodcousa.com/bhn_test_main.htm.

 
   

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