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 3000kg	Firth 120kg	Rockwell C	Rockwell B	Scleroscope
800		72		100
760	1170	70		98
725	1060	67		96
682	940	65		93
652	867	63		89
614	775	61		85
590	727	59		81
552	649	56		76
529	606	54		74
502	565	52	119	70
477	534	49	118	67
451	489	47	117	65
427	460	45	115	62
401	423	43	114	58
375	390	41	113	55
362	380	39	111	53
346	352	37	110	50
331	335	36	109	47
311	312	34	108	46
293	291	32	106	44
276	278	30	105	42
261	261	28	103	40
255	255	26	102	39
245	246	24	100	37
237	235	23	99	35
224	221	21	97	33
211	213	19	95	32
203	201	17	94	31
196	197	15	92	30
187	186	13	91	29
183	183	11	90	28
175	174	9	88	27
167	168	6	87	27
163	162	4	85	26
156	154	2	83	25
152	150		82	24
147	147		80	24
143	144		79	23
140	141		77	22
130	130		72	22

Subjects: Mechanical Engineering

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Hardness