Mitutoyo HM-200A Series - Page 144

No. 99MBG127A
9-6
SAE STEEL 1 (SAE J 417 DEC8, for iron steel, HV to others hardness conversion chart*1),
continued
*1 The values indicated in boldface correspond to the converted hardness in ASTM E 140 Table1,
determined by SAE-ASM-AST associated committee.
*2 The values indicated in parenthesis deviate from normal use hardness value. Consider them
as references.
HV HBS HBW HS TENS2 TENS
29421N,
10mmBal
29421N,
10mmBal
HRA HRB HRC HRD HR15N HR30N HR45N (MPa)
380 360 360 69.8 (110.0.) 38.8 54.4 79.8 58.4 41.7 52 1205 175
370 350 350 69.2 --- 37.7 53.6 79.2 57.4 40.4 --- 1170 170
360 341 341 68.7 (109.0) 36.6 52.8 78.6 56.4 39.1 50 1130 164
350 331 331 68.1 --- 35.5 51.9 78.0 55.4 37.8 --- 1095 159
340 322 322 67.6 (108.0) 34.4 51.1 77.4 54.4 36.5 47 1070 155
330 313 313 67.0 --- 33.3 50.2 76.8 53.6 35.2 --- 1035 150
320 393 303 66.4 (107.0) 32.2 49.4 76.2 52.3 33.9 45 1005 146
310 294 294 65.8 --- 31.0 48.4 75.6 51.3 32.5 --- 980 142
300 284 284 65.2 (105.5) 29.8 47.5 74.9 50.2 31.1 42 950 138
295 280 280 64.8 --- 29.2 47.1 74.6 49.7 30.4 --- 935 136
290 275 275 64.5 (104.5) 28.5 46.5 74.2 49.0 29.5 41 915 133
285 270 270 64.2 --- 27.8 46.0 73.8 48.4 28.7 --- 905 131
280 265 265 63.8 (103.5) 27.1 45.3 73.4 47.8 27.9 40 890 129
275 261 261 63.5 --- 26.4 44.9 73.0 47.2 27.1 --- 875 127
270 256 256 63.1 (102.0) 25.6 44.3 72.6 46.4 26.2 38 855 124
265 252 252 62.7 --- 24.8 43.7 72.1 45.7 25.2 --- 840 122
260 247 247 62.4 (101.0) 24.0 43.1 71.6 45.0 24.3 37 825 120
255 243 243 62.0 --- 23.1 42.2 71.1 44.2 23.2 --- 805 117
250 238 238 61.6 95.5 22.2 41.7 70.6 43.4 22.2 36 795 115
245 233 233 61.2 --- 21.3 41.1 70.1 42.5 21.1 --- 780 113
240 228 228 60.7 98.1 20.3 40.3 69.6 41.7 19.9 34 765 111
230 219 219 96.7 (18.0) 33 730 106
220 209 209 95.0 (15.7) 32 695 101
210 200 200 93.4 (13.4) 30 670 97
200 190 190 91.5 (11.0) 29 635 92
190 181 181 89.5 ( 8.5) 28 605 88
180 171 171 87.1 ( 6.0) 26 580 84
170 162 162 85.0 ( 3.0) 25 545 79
160 152 152 81.7 ( 0.0) 24 515 75
150 143 143 78.7 22 490 71
140 133 133 75.0 21 455 66
130 124 124 71.2 20 425 62
120 114 114 66.7 390 57
110 105 105 62.3
100 95 95 56.2
95 90 90 52.0
90 86 86 48.0
85 81 81 41.0
Rockwell Hardness No.
b
Rockwell Superficial