GENERALLY HARDNESS IS COMPARED WITH THE STANDARD METAL
(DIAMOND)WHOSE HARDNESS IS EXTREME SAY 100.BASED ON THE
HARDNESS PROPERTIES IT CAN BE EXHIBITED IN brinell hardness
(HB),rockwell hardness(HRC),VICKMERS INDEX
Depends upon the test performed. However the hardness is
designated by some number. If Brinell Hardness Test is used
then hardness-number is followed by BHN.For Rock-well test
it is denoted by HRC,HRA,HRB etc.