ビッカースからの換算はこちらの投稿を参考に。
ロックウェル硬さの適応範囲(JIS Z 2245)があるのでまずはじめに注意が必要である。
硬さ | 最小 | 最大 |
HRA | 20 | 95 |
HRB | *10 | 100 |
HRC | 20 | 70 |
HRD | 40 | 77 |
HR15N | 70 | 94 |
HR30N | 42 | 86 |
HR45N | 20 | 77 |
*:圧子が適切な寸法の場合、10HRCまで適応する範囲を拡張しても良い。
ロックウェル硬さ早見表。カッコは非JIS。HRR, HRL, HRM, HREはJISK7202-2にて規定。HREはJISZ2245にもある。
ロックウェル スーパーフィシャル硬さ(予荷重3kgf) |
ロックウェル硬さ (予荷重10kgf) |
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測定荷重 | 15kgf | 30kgf | 45kgf | 60kgf | 100kgf | 150kgf |
1/16"硬球 | 15T | 30T | 45T | F | B | G |
1/8"硬球 | (15W) | (30W) | (45W) | H | E | K |
1/4"硬球 | (15X) | (30X) | (45X) | L | M | (P) |
1/2"硬球 | (15Y) | (30Y) | (45Y) | R | (S) | (V) |
Diamond | 15N | 30N | 45N | A | D | C |
HR**はロックウェル硬さ(HRA, HRB, HRC, HRD, HR15N, HR30N, HR45N)
HVはビッカース硬さ
HBはブリネル硬さ(10mmの球で3000kgfで押すとHB 10/3000)、硬球で押すのであまりにも硬い材料だと鋼球も潰れて値がおかしくなる。
HBWはタングステンカーバイドの球で押す場合。
HSはショア硬さ。
Tensile Strengthは引張強度。おおよそビッカース硬さの3.3倍程度の値になる。
SAE J 417硬さ換算表より(鉄鋼材)
HRC | HV | HB10/3000 | HBW10/3000 | HRA | HRB | HRD | HR15N | HR30N | HR45N | HS | Tensile Stength [MPa] |
68 | 940 | - | - | 85.6 | - | 76.9 | 93.2 | 84.4 | 75.4 | 98.0 | - |
67 | 900 | - | - | 85.0 | - | 76.1 | 92.9 | 83.6 | 74.2 | 95.6 | - |
66 | 865 | - | - | 84.5 | - | 75.4 | 92.5 | 82.8 | 73.3 | 93.4 | - |
65 | 832 | - | (739) | 83.9 | - | 74.5 | 92.2 | 81.9 | 72.0 | 91.2 | - |
64 | 800 | - | (722) | 83.4 | - | 73.8 | 91.8 | 81.1 | 71.0 | 89.0 | - |
63 | 772 | - | (705) | 82.8 | - | 73.0 | 91.4 | 80.1 | 69.9 | 87.1 | - |
62 | 746 | - | (688) | 82.3 | - | 72.2 | 91.1 | 79.3 | 68.8 | 85.2 | - |
61 | 720 | - | (670) | 81.8 | - | 71.5 | 90.7 | 78.4 | 67.7 | 83.3 | - |
60 | 697 | - | (654) | 81.2 | - | 70.7 | 90.2 | 77.5 | 66.6 | 81.5 | - |
59 | 674 | - | (634) | 80.7 | - | 69.9 | 89.8 | 76.6 | 65.5 | 79.7 | - |
58 | 653 | - | 615 | 80.1 | - | 69.2 | 89.3 | 75.7 | 64.3 | 78.1 | - |
57 | 633 | - | 595 | 79.6 | - | 68.5 | 88.9 | 74.8 | 63.2 | 76.4 | - |
56 | 613 | - | 577 | 79.0 | - | 67.7 | 88.3 | 73.9 | 62.0 | 74.8 | - |
55 | 595 | - | 560 | 78.5 | - | 66.9 | 87.9 | 73.0 | 60.9 | 73.2 | 2075 |
54 | 577 | - | 543 | 78.0 | - | 66.1 | 87.4 | 72.0 | 59.8 | 71.7 | 2015 |
53 | 560 | - | 525 | 77.4 | - | 65.4 | 86.9 | 71.2 | 58.6 | 70.2 | 1950 |
52 | 544 | (500) | 512 | 76.8 | - | 64.6 | 86.4 | 70.2 | 57.4 | 68.8 | 1880 |
51 | 528 | (487) | 496 | 76.3 | - | 63.8 | 85.9 | 69.4 | 56.1 | 67.3 | 1820 |
50 | 513 | (475) | 481 | 75.9 | - | 63.1 | 85.5 | 68.5 | 55.0 | 65.9 | 1760 |
49 | 498 | (464) | 469 | 75.2 | - | 62.1 | 85.0 | 67.6 | 53.8 | 64.5 | 1695 |
48 | 484 | 451 | 455 | 74.7 | - | 61.4 | 84.5 | 66.7 | 52.5 | 63.1 | 1635 |
47 | 471 | 442 | 443 | 74.1 | - | 60.8 | 83.9 | 65.8 | 51.4 | 61.9 | 1580 |
46 | 458 | 432 | 432 | 73.6 | - | 60.0 | 83.5 | 64.8 | 50.3 | 60.6 | 1530 |
45 | 446 | 421 | 421 | 73.1 | - | 59.2 | 83.0 | 64.0 | 49.0 | 59.4 | 1480 |
44 | 434 | 409 | 409 | 72.5 | - | 58.5 | 82.5 | 63.1 | 47.8 | 58.2 | 1435 |
43 | 423 | 400 | 400 | 72.0 | - | 57.7 | 82.0 | 62.2 | 46.7 | 57.1 | 1385 |
42 | 412 | 390 | 390 | 71.5 | - | 56.9 | 81.5 | 61.3 | 45.5 | 55.9 | 1340 |
41 | 402 | 381 | 381 | 70.9 | - | 56.2 | 80.9 | 60.4 | 44.3 | 54.9 | 1295 |
40 | 392 | 371 | 371 | 70.4 | - | 55.4 | 80.4 | 59.5 | 43.1 | 53.8 | 1250 |
39 | 382 | 362 | 362 | 69.9 | - | 54.6 | 79.9 | 58.6 | 41.9 | 52.7 | 1215 |
38 | 372 | 353 | 353 | 69.4 | - | 53.8 | 79.4 | 57.7 | 40.8 | 51.6 | 1180 |
37 | 363 | 344 | 344 | 68.9 | - | 53.1 | 78.8 | 56.8 | 39.6 | 50.6 | 1160 |
36 | 354 | 336 | 336 | 68.4 | (109.0) | 52.3 | 78.3 | 55.9 | 38.4 | 49.6 | 1115 |
35 | 345 | 327 | 327 | 67.9 | (108.5) | 51.5 | 77.7 | 55.0 | 37.2 | 48.6 | 1080 |
34 | 336 | 319 | 319 | 67.4 | (108.0) | 50.8 | 77.2 | 54.2 | 36.1 | 47.6 | 1055 |
33 | 327 | 311 | 311 | 66.8 | (107.5) | 50.0 | 76.6 | 53.3 | 34.9 | 46.6 | 1025 |
32 | 318 | 301 | 301 | 66.3 | (107.0) | 49.2 | 76.1 | 52.1 | 33.7 | 45.5 | 1000 |
31 | 310 | 294 | 294 | 65.8 | (106.0) | 48.4 | 75.6 | 51.3 | 32.5 | 44.6 | 980 |
30 | 302 | 286 | 286 | 65.3 | (105.5) | 47.7 | 75.0 | 50.4 | 31.3 | 43.6 | 950 |
29 | 294 | 279 | 279 | 64.7 | (104.5) | 47.0 | 74.5 | 49.5 | 30.1 | 42.7 | 930 |
28 | 286 | 271 | 271 | 64.3 | (104.0) | 46.1 | 73.9 | 48.6 | 28.9 | 41.7 | 910 |
27 | 279 | 264 | 264 | 63.8 | (103.0) | 45.2 | 73.3 | 47.7 | 27.8 | 40.9 | 880 |
26 | 272 | 258 | 258 | 63.3 | (102.5) | 44.6 | 72.8 | 46.8 | 26.7 | 40.0 | 860 |
25 | 266 | 253 | 253 | 62.8 | (101.5) | 43.8 | 72.2 | 45.9 | 25.5 | 39.3 | 840 |
24 | 260 | 247 | 247 | 62.4 | (101.0) | 43.1 | 71.6 | 45.0 | 24.3 | 38.5 | 825 |
23 | 254 | 243 | 243 | 62.0 | 100.0 | 42.1 | 71.0 | 44.0 | 23.1 | 37.7 | 805 |
22 | 248 | 237 | 237 | 61.5 | 99.0 | 41.6 | 70.5 | 43.2 | 22.0 | 37.0 | 785 |
21 | 243 | 231 | 231 | 61.0 | 98.5 | 40.9 | 69.9 | 42.3 | 20.7 | 36.4 | 770 |
20 | 238 | 226 | 226 | 60.5 | 97.8 | 40.1 | 69.4 | (41.5) | (19.6) | 35.7 | 760 |
(18) | 230 | 219 | 219 | - | 96.7 | - | - | - | - | 34.7 | 730 |
(16) | 222 | 212 | 212 | - | 95.5 | - | - | - | - | 33.6 | 705 |
(14) | 213 | 203 | 203 | - | 93.9 | - | - | - | - | 32.4 | 675 |
(12) | 204 | 194 | 194 | - | 92.3 | - | - | - | - | 31.2 | 650 |
(10) | 196 | 187 | 187 | - | 90.7 | - | - | - | - | 30.2 | 620 |
(8) | 188 | 179 | 179 | - | 89.5 | - | - | - | - | - | 600 |
(6) | 180 | 171 | 171 | - | 87.1 | - | - | - | - | - | 580 |
(4) | 173 | 165 | 165 | - | 85.5 | - | - | - | - | - | 550 |
(2) | 166 | 158 | 158 | - | 83.5 | - | - | - | - | - | 530 |
(0) | 160 | 152 | 152 | - | 81.7 | - | - | - | - | - | 515 |