Hardness

Resistance of metal to plastic deformation usually by indentation. However, the term may also refer to stiffness or temper, or to resistance to scratching, abrasion, or cutting.

Indentation hardness may be measured by various hardness tests, such as Brinnell, Rockwell, and Vickers.

Many ceramics, and even glasses, are ductile under small indents, allowing the yield strength in compression (elastic limit) to be inferred from hardness tests.

Brinell 10mm 3000kgFirth 120kgRockwell CRockwell BScleroscope
800 72 100
760117070 98
725106067 96
68294065 93
65286763 89
61477561 85
59072759 81
55264956 76
52960654 74
5025655211970
4775344911867
4514894711765
4274604511562
4014234311458
3753904111355
3623803911153
3463523711050
3313353610947
3113123410846
2932913210644
2762783010542
2612612810340
2552552610239
2452462410037
237235239935
224221219733
211213199532
203201179431
196197159230
187186139129
183183119028
17517498827
16716868727
16316248526
15615428325
152150 8224
147147 8024
143144 7923
140141 7722
130130 7222

See also: Abrasion Hardness, Brinell Hardness, Brinell Hardness Test, Mechanical Properties, Mohs, Rockwell Hardness, Shore Durometer, Shore Hardness, Vicker′s Hardness.

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Subjects: Materials