Common Hardness of Materials

Material Knoop Hardness
Talc 20
Silver 20
Cooper 163
Aluminium 80-250
Annealed Steel 200
Martensite 500-800
Glass 530
Carburized Steel 730
Chromium Plating 740
Quarz (Silicon Dioxide) 820
White Cast Iron 840
Nitrided Steel 970
Cementite (Iron Carbide) 1025
Zirconia 1160
Zirconium Boride 1550
Chromium Carbide 1735
Molybdenum Carbide 1800
Titanium Carbide 1800
Tungsten Carbide 1880
Tantalum Carbide 2000
Alumina 2100
Zirconium Carbide 2100
Beryllium Carbide 2410
Titanium Carbide 2470
Silicon Carbide 2480
Aluminium Boride 2500
Vanadium Carbide 2660
Boron Carbide 2750
Titanium Diboride 4400
Diamond 7000

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