Sindoh D200 Series - Hardness Conversion Table

189
HARDNESS CONVERSION TABLE
(Approximate equivalent hardness numbers for steel and approximate relationship
between hardness number and Ultimate Tensile Strength for steel.)
Brinell
Indentation
Diameter
(mm)
Brinell
Hardness
Number
3000kg load
10mm
Tungsten
Carbide Ball
Rockwell Hardness Number
Ultimate
Tensile
Strength
(Approximate)
times 1000 psi
A-Scale
60kg Load
Brale
Penetrator
B-Scale
100kg
Load
1/16
In.
Diam.
Ball
C-Scale
150kg
Load Brale
Penetrator
2.25
745
84.1
65.3
2.30
710
83.2
63.3
2.35
682
82.2
61.7
2.40
653
81.2
60.0
2.45
627
80.5
58.7
2.50
601
79.8
57.3
2.55
578
79.1
56.0
2.60
555
78.4
54.7
298
2.65
534
77.8
53.5
288
2.70
514
76.9
52.1
274
2.75
495
76.3
51.0
264
2.80
477
75.6
49.6
252
2.85
461
74.9
48.5
242
2.90
444
74.2
47.1
230
2.95
429
73.4
45.7
219
3.00
415
72.8
44.5
212
3.05
401
72.0
43.1
202
3.10
388
71.4
41.8
193
3.15
375
70.6
40.4
184
3.20
363
70.0
39.1
177
3.25
352
69.3
(110.0)
37.9
171
3.30
341
68.7
(109.0)
36.6
164
3.35
331
68.1
(108.5)
35.5
159
3.40
321
67.5
(108.0)
34.3
154
3.45
311
66.9
(107.5)
33.1
149
3.50
302
66.3
(107.0)
32.1
146
3.55
293
65.7
(106.0)
30.9
141
3.60
285
65.3
(105.5)
29.9
138
3.65
277
64.6
(104.5)
28.8
134
3.70
265
64.1
(104.0)
27.6
130
3.75
262
63.6
(103.0)
26.6
127
3.80
255
63.0
(102.0)
25.4
123