9. Appendix
No. 99MBG127A
9-7
9.1.4 ASTM hard (ASTM E 140, for hard steel (non-austenitic steels),
HRC to others hardness conversion chart)
HRC HV HK HRA HRD HR15N HR30N HR45N
HBS
29421N
HBW
29421N
4.9035N,
and Over
68 940 920 85.6 76.9 93.2 84.4 75.4 97.3
67 900 895 85.0 76.1 92.9 83.6 74.2 95.0
66 865 870 84.5 75.4 92.5 82.8 73.3 92.7
65 832 (739) 846 83.9 74.5 92.2 81.9 72.0 90.6
64 800 (722) 822 83.4 73.8 91.8 81.1 71.0 88.5
63 772 (705) 799 82.8 73.0 91.4 80.1 69.9 86.5
62 746 (688) 776 82.3 72.2 91.1 79.3 68.8 84.5
61 720 (670) 754 81.8 71.5 90.7 78.4 67.7 82.6
60 697 (654) 732 81.2 70.7 90.2 77.5 66.6 80.8
59 674 (634) 710 80.7 69.9 89.8 76.6 65.5 79.0
58 653 615 690 80.1 69.2 89.3 75.7 64.3 77.3
57 633 595 670 79.6 68.5 88.9 74.8 63.2 75.6
56 613 577 650 79.0 67.7 88.3 73.9 62.0 74.0
55 595 560 630 78.5 66.9 87.9 73.0 60.9 72.4
54 577 543 612 78.0 66.1 87.4 72.0 59.8 70.9
53 560 525 594 77.4 65.4 86.9 71.2 58.6 69.4
52 544 (500) 512 576 76.8 64.6 86.4 70.2 57.4 67.9
51 528 (487) 496 558 76.3 63.8 85.9 69.4 56.1 66.5
50 513 (475) 481 542 75.9 63.1 85.5 68.5 55.0 65.1
49 498 (464) 469 526 75.2 62.1 85.0 67.6 53.8 63.7
48 484 451 455 510 74.7 61.4 84.5 66.7 52.5 62.4
47 471 442 443 495 74.1 60.8 83.9 65.8 51.4 61.1
46 458 432 432 480 73.6 60.0 83.5 64.8 50.3 59.8
45 446 421 421 466 73.1 59.2 83.0 64.0 49.0 58.5
44 434 409 409 452 72.5 58.5 82.5 63.1 47.8 57.3
43 423 400 400 438 72.0 57.7 82.0 62.2 46.7 56.1
42 412 390 390 426 71.5 56.9 81.5 61.3 45.5 54.9
41 402 381 381 414 70.9 56.2 80.9 60.4 44.3 53.7
40 392 371 371 402 70.4 55.4 80.4 59.5 43.1 52.6
39 382 362 362 391 69.9 54.6 79.9 58.6 41.9 51.5
38 372 353 353 380 69.4 53.8 79.4 57.7 40.8 50.4
37 363 344 344 370 68.9 53.1 78.8 56.8 39.6 49.3
36 354 336 336 360 68.4 52.3 78.3 55.9 38.4 48.2
35 345 327 327 351 67.9 51.5 77.7 55.0 37.2 47.1
34 336 319 319 342 67.4 50.8 77.2 54.2 36.1 46.1
33 327 311 311 334 66.8 50.0 76.6 53.3 34.9 45.1
32 318 301 301 326 66.3 49.2 76.1 52.1 33.7 44.1
31 310 294 294 318 65.8 48.4 75.6 51.3 32.5 43.1
30 302 286 286 311 65.3 47.7 75.0 50.4 31.3 42.2
29 294 279 279 304 64.8 47.0 74.5 49.5 30.1 41.3
28 286 271 271 297 64.3 46.1 73.9 48.6 28.9 40.4
27 279 264 264 290 63.8 45.2 73.3 47.7 27.8 39.5
26 272 258 258 284 63.3 44.6 72.8 46.8 26.7 38.7
25 266 253 253 278 62.8 43.8 72.2 45.9 25.5 37.8
24 260 247 247 272 62.4 43.1 71.6 45.0 24.3 37.0
23 254 243 243 266 62.0 42.1 71.0 44.0 23.1 36.3
22 248 237 237 261 61.5 41.6 70.5 43.2 22.0 35.5
21 243 231 231 256 61.0 40.9 69.9 42.3 20.7 34.8
20 238 226 226 251 60.5 40.1 69.4 41.5 19.6 34.2
Sclero-
scope
HS
D
Brinell Hardness
Number
C
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