Hardness Conversion Chart

Tensile Strength (N/mm2) Hardness Vickers Hardness Brinell* HRB HRF HRA HRC Specifications
770 240 228 98.1 114.3 60.7 20.3
785 245 233 61.2 21.3
800 250 238 99.5 115.1 61.6 22.2
820 265 242 62.0 23.1
835 260 247 (101) 62.4 24.0
850 265 252 62.7 25.8 410/416
865 270 257 (102) 63.1 25.8 410/416
880 275 261 63.5 22.2
900 208 266 (104) 63.8 27.1
915 285 271 64.2 27.8
930 290 276 (105) 64.5 28.5
950 295 280 64.8 29.2
965 300 285 65.2 29.8
995 310 295 65.8 31.0
1030 320 304 66.4 32.2
1060 330 314 67.0 33.3
1095 340 323 67.6 34.4
1125 350 333 68.1 35.5
1155 360 342 68.7 36.6 S-monel
1190 370 352 69.2 37.7
1220 380 361 69.8 38.8 K-monel
1225 390 371 70.3 39.8
1290 400 380 70.8 40.8 Beryllium Copper
1320 410 390 71.4 41.8
1350 420 399 71.8 42.7
1385 430 409 72.3 43.6
1420 440 418 72.8 44.5
1455 450 428 73.3 45.3
1485 460 437 73.6 46.1
1520 470 447 74.1 46.9
1555 480 (456) 74.5 47.7
1595 490 (466) 74.8 48.4 Satellite
1630 500 (475) 75.3 49.1
1665 510 (485) 75.7 49.8
1700 520 (494) 76.1 50.5
1740 530 (504) 76.4 51.1
1775 540 (513) 76.7 51.7
1810 550 (523) 77.0 52.3 420
1845 560 (532) 77.4 53.0
1880 570 (542) 77.8 53.6
1920 580 (551) 78.0 54.1 420C
1955 590 (561) 78.4 54.7 420C
1995 600 (570) 78.6 55.2 440B, S2, 420C
2030 610 (580) 78.9 55.7 440B, S2, 420C
2070 620 (589) 79.2 56.3 S2, 420C
2105 630 (599) 79.5 56.5 S2, 420C
2145 640 (608) 79.8 57.3 S2, 420C
2180 650 (618) 80.0 57.8 S2, 420C
660 80.3 58.3 440C, Carbon, S2, 420C
670 80.3 58.3 440C, Carbon, S2, 420C
670 80.6 58.8 440C, Carbon, S2, 420C
680 80.8 59.2 440C, Carbon, S2, 420C
690 81.1 59.7 440C, Carbon, S2, 420C
700 81.3 60.1 SAE 52100, 440C, Carbon, S2, 420C
720 81.8 61.0 SAE 52100, 440C, Carbon, S2
740 82.2 61.8 SAE 52100, 440C, Carbon, S2
760 82.6 62.5 SAE 52100, 440C, Carbon
780 83.0 63.3 SAE 52100
800 83.4 64.0 SAE 52100
820 83.8 64.7 SAE 52100
840 84.1 65.3 SAE 52100
860 84.4 65.9 SAE 52100
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