The Mohs hardness of sodium chloride is 2,5.
the mineral that has a hardness of 7 is "Quarts
something we dont know!
when ductility increase hardness decrease
Yes, hardness is a specific property of each material.
The Rockwell C Hardness system uses "HRC" as a measure of hardness for various materials. A hardness of 68 HRC is extremely high and will most likely be harder than simple steel.
Hardness of metal is determined by the carbon content. HRC is the Rockwell Hardness Scale. A hardness of 55-58 is not very hard compared to carbon steel.
Hardness Conversion TableTensileStrength(N/mm2)Brinell Hardness(BHN)Vickers Hardness(HV)RockwellHardness(HRB)Rockwell Hardness(HRC)28586903209510056.235010511062.338511412066.741512413071.245013314075.048014315078.751015216081.754516217085.057517118087.161018119089.564019020091.567519921093.570520922095.074021923096.777022824098.180023825099.582024225523.185025226524.888026127526.490026628027.193027629028.595028029529.299529531031.0103030432032.2106031433033.3109532334034.4112533335035.5115534236036.6119035237037.7122036138038.8125537139039.8129038040040.8132039041041.8135039942042.7138540943043.6142041844044.5145542845045.3148543746046.1152044747046.9155545648047.7159546649048.4163047550049.1166548551049.8170049452050.5174050453051.1177551354051.7181052355052.3184553256053.0188054257053.6192055158054.1195556159054.7199557060055.2203058061055.7207058962056.3210559963056.8214560864057.3218061865057.8
13-16 hrc
approximately 90 HRC
28 - 32 hrc
Aluminum's hardness is 15 Brinell.
hra
high ruptured capacity
8.75 g/cm3
42 to 45 HRC
It can range from 10 HRc to 50 HRc it's all dependent on how it's heat treated and quenched.