Material Hardness Tables

The hardness of steel is generally determined by testing its resistance to deformation
.


Material Hardness Conversion Table

Brinell
Rockwell C
Shore
Vickers
682
62
84
737
653
60
81
697
627
59
79
667
601
58
77
640
578
56
75
615
555
55
73
591
534
54
71
569
514
52
70
547
495
51
68
528
477
50
66
508
461
48
65
491
444
47
63
474
429
46
61
455
415
44
59
440
401
43
58
425
388
42
56
410
375
40
54
396
363
39
52
383
352
38
51
372
341
37
50
360
331
36
48
350
321
34
47
339
311
33
46
328
302
32
45
319
293
31
43
309
285
30
42
301
277
29
41
292
269
28
40
284
262
27
39
276
255
25
38
269
248
24
37
261
241
23
36
253
235
22
35
247

Brinell
The Brinell hardness test for steel, involves impressing a ball 10 mm diameter, of hard steel or tungsten carbide, with a loading of 3000 kilogrammes into the steel surface. The hardness of the steel is then determined by measurement of the indentation.

Rockwell
A method for testing the hardness of metals by determining the depth of penetration of a steel ball or a diamond sphero-conical indentor. The value is read from a dial and is an arbitrary number related to the depth of penetration. For testing hard steels, a sphero-conical diamond is used with a 150 kg load, the result is read from the black scale on the dial and is prefixed with the letter C.

Shore
The shore scleroscope measures hardness in terms of the elasticity of the material. A diamond-tipped hammer in a graduated glass tube is allowed to fall from a known height on the specimen to be tested, and the hardness number depends on the height to which the hammer rebounds.

Vickers
A method of determining the hardness of steel whereby a diamond pyramid is pressed into the polished surface of the specimen and the diagonals of the impression are measured with a microscope fitted with a micrometer eye piece.

 

 

 

 



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