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硬さ換算表（規格：SAE/ASTM/DIN[ISO]）

2022年8月4日

SAE・ASTM・DIN（ISO）の規定にある硬さ換算表をまとめています。

下記リンクより、各規格の換算表を見ることができます。

硬さ換算表 （SAE J 417）

▼この表は横にスクロールしてご覧いただけます。

■鋼のロックウェルC硬さに対する近似的換算値(1)

SAE J 417（1983年改訂）
(HRC)
ロックウェル
Cスケール硬さ		 (HV)
ビッカース硬さ		 ブリネル硬さ(HB)
10mm球
荷重3000kgf		 ロックウェル硬さ(3) ロックウェルスーパーフィシャル硬さ
ダイヤモンド円錐圧子		 (Hs)
ショア硬さ		 引張強さ
(近似値)
MPa
(kgf/m㎡)
(2)		 ロックウェル
Cスケール硬さ
(3)
標準球 ダングステン
カーバイド球		 (HRA)
Aスケール
荷重60kgf
ダイヤモンド
円錐圧子		 (HRB)
Bスケール
荷重100kgf
経1.6mm
(1/16in)球		 (HRD)
Dスケール
荷重100kgf
ダイヤモンド
円錐圧子		 15-N
スケール
荷重15kgf		 30-N
スケール
荷重30kgf		 45-N
スケール
荷重45kgf
68 940 – – 85.6 – 76.9 93.2 84.4 75.4 97 – 68
67 900 – – 85.0 – 76.1 92.9 83.6 74.2 95 – 67
66 865 – – 84.5 – 75.4 92.5 82.8 73.3 92 – 66
65 832 – (739) 83.9 – 74.5 92.2 81.9 72.0 91 – 65
64 800 – (722) 83.4 – 73.8 91.8 81.1 71.0 88 – 64
63 772 – (705) 82.8 – 73.0 91.4 80.1 69.9 87 – 63
62 746 – (688) 82.3 – 72.2 91.1 79.3 68.8 85 – 62
61 720 – (670) 81.8 – 71.5 90.7 78.4 67.7 83 – 61
60 697 – (654) 81.2 – 70.7 90.2 77.5 66.6 81 – 60
59 674 – (634) 80.7 – 69.9 89.8 76.6 65.5 80 – 59
58 653 – 615 80.1 – 69.2 89.3 75.7 64.3 78 – 58
57 633 – 595 79.6 – 68.5 88.9 74.8 63.2 76 – 57
56 613 – 577 79.0 – 67.7 88.3 73.9 62.0 75 – 56
55 595 – 560 78.5 – 66.9 87.9 73.0 60.9 74 2075(212) 55
54 577 – 543 78.0 – 66.1 87.4 72.0 59.8 72 2015(205) 54
53 560 – 525 77.4 – 65.4 86.9 71.2 58.5 71 1950(199) 53
52 544 (500) 512 76.8 – 64.6 86.4 70.2 57.4 69 1880(192) 52
51 528 (487) 496 76.3 – 63.8 85.9 69.4 56.1 68 1820(186) 51
50 513 (475) 481 75.9 – 63.1 85.5 68.5 55.0 67 1760(179) 50
49 498 (464) 469 75.2 – 62.1 85.0 67.6 53.8 66 1695(173) 49
48 484 451 455 74.7 – 61.4 84.5 66.7 52.5 64 1635(167) 48
47 471 442 443 74.1 – 60,8 83.9 65.8 51.4 63 1580(161) 47
46 458 432 432 73.6 – 60.0 83.5 64.8 50.3 62 1530(156) 46
45 446 421 421 73.1 – 59.2 83.0 64.0 49.0 60 1480(151) 45
44 434 409 409 72.5 – 58.5 82.5 63.1 47.8 58 1435(146) 44
43 423 400 400 72.0 – 57.7 82.0 62.2 46.7 57 1385(141) 43
42 412 390 390 71.5 – 56.9 81.5 61.3 45.5 56 1340(136) 42
41 402 381 381 70.9 – 56.2 80.9 60.4 44.3 55 1295(132) 41
40 392 371 371 70.4 – 55.4 80.4 59.5 43.1 54 1250(127) 40
39 382 362 362 69.9 – 54.6 79.9 58.6 41.9 52 1215(124) 39
38 372 353 353 69.4 – 53.8 79.4 57.7 40.8 51 1180(120) 38
37 363 344 344 68.9 – 53.1 78.8 56.8 39.6 50 1160(118) 37
36 354 336 336 68.4 (109.0) 52.3 78.3 55.9 38.4 49 1115(114) 36
SAE J 417（1983年改訂）
(HRC)
ロックウェル
Cスケール硬さ		 (HV)
ビッカース硬さ		 ブリネル硬さ(HB)
10mm球
荷重3000kgf		 ロックウェル硬さ(3) ロックウェルスーパーフィシャル硬さ
ダイヤモンド円錐圧子		 (Hs)
ショア硬さ		 引張強さ
(近似値)
MPa
(kgf/m㎡)
(2)		 ロックウェル
Cスケール硬さ
(3)
標準球 ダングステン
カーバイド球		 (HRA)
Aスケール
荷重60kgf
ダイヤモンド
円錐圧子		 (HRB)
Bスケール
荷重100kgf
経1.6mm
(1/16in)球		 (HRD)
Dスケール
荷重100kgf
ダイヤモンド
円錐圧子		 15-N
スケール
荷重15kgf		 30-N
スケール
荷重30kgf		 45-N
スケール
荷重45kgf
35 345 327 327 67.9 (108.5) 51.5 77.7 55.0 37.2 48 1080(110) 35
34 336 319 319 67.4 (108.0) 50.8 77.2 54.2 36.1 47 1055(108) 34
33 327 311 311 66.8 (107.5) 50.0 76.6 53.3 34.9 46 1025(105) 33
32 318 301 301 66.3 (107.0) 49.2 76.1 52.1 33.7 44 1000(102) 32
31 310 294 294 65.8 (106.0) 48.4 75.6 51.3 32.7 43 980(100) 31
30 302 286 286 65.3 (105.5) 47.7 75.0 50.4 31.3 42 950(97) 30
29 294 279 279 64.7 (104.5) 47.0 74.5 49.5 30.1 41 930(95) 29
28 286 271 271 64.3 (104.0) 46.1 73.9 48.6 28.9 41 910(93) 28
27 279 264 264 63.8 (103.0) 45.2 73.3 47.7 27.8 40 880(90) 27
26 272 258 258 63.3 (102.5) 44.6 72.8 46.8 26.7 38 860(88) 26
25 266 253 253 62.8 (101.5) 43.8 72.2 45.9 25.5 38 840(86) 25
24 260 247 247 62.4 (101.0) 43.1 71.6 45.0 24.3 37 825(84) 24
23 254 243 243 62.0 100.0 42.1 71.0 44.0 23.1 36 805(82) 23
22 248 237 237 61.5 99.0 41.6 70.5 43.2 22.0 35 785(80) 22
21 243 231 231 61.0 98.5 40.9 69.9 42.3 20.7 35 770(79) 21
20 238 226 226 60.5 97.8 40.1 69.4 41.5 19.6 34 760(77) 20
(18) 230 219 219 – 96.7 – – – – 33 730(75) (18)
(16) 222 212 212 – 95.5 – – – – 32 705(72) (16)
(14) 213 203 203 – 93.9 – – – – 31 675(69) (14)
(12) 204 194 194 – 92.3 – – – – 29 650(66) (12)
(10) 196 187 187 – 90.7 – – – – 28 620(63) (10)
(8) 188 179 179 – 89.5 – – – – 27 600(61) (8)
(6) 180 171 171 – 87.1 – – – – 26 580(59) (6)
(4) 173 165 165 – 85.5 – – – – 25 550(56) (4)
(2) 166 158 158 – 83.5 – – – – 24 530(54) (2)
(0) 160 152 152 – 81.7 – – – – 24 515(53) (0)

※(1) 青色の数字は、ASTM E 140 表1による(SAE・ASM・ASTMが合同で調整したもの)。
(2) 括弧( )をつけて示してある単位及び数値は、JIS Z 8413 及びJIS Z 8438 換算表によりpsiから換算したもの。なお1MPa=1N/m㎡
(3) 表中括弧( )内の数字は、あまり用いられない範囲のものであり参考として示したもの。

Standard Hardness Conversion Tables（ASTEM E 140）

▼The table can be viewed by scrolling horizontally.

■Approximate Hardness Conversion Numbers for Non-Austenitic Steels(Rockwell-C Hardness Range) *1), 2)

ASTEM E 140 TABLE1
Rockwell C
Hardness
Number
150 kgf
(HRC)		 Vickers
Hardness
Number
(HV)		 Brinell Hardness Number*3) Knoop
Hardness,
Number
500-gf and
Over
(HK)		 Rockwell
Hardness Number		 Rockwell Superficial
Hardness Number		 Scleroscope
Hardness
Number*4)		 Rokwell C
Hardness
Number
150 kgf
(HRC)
10-mm
Stabdard Ball,
3000-kgf
(HBS)		 10-mm
Carbide Ball,
3000-kgf
(HBW)		 A Scale,
60-kgf
(HRA)		 D Scale,
100-kgf
(HRD)		 15-N Scale,
15-kgf
(HR 15-N)		 30-N Scale,
30-kgf
(HR 30-N)		 45-N Scale,
45-kgf
(HR 45-N)
68 940 – – 920 85.6 76.9 93.2 84.4 75.4 97.3 68
67 900 – – 895 85.0 76.1 92.9 83.6 74.2 95.0 67
66 865 – – 870 84.5 75.4 92.5 82.8 73.3 92.7 66
65 832 – (739) 846 83.9 74.5 92.2 81.9 72.0 90.6 65
64 800 – (722) 822 83.4 73.8 91.8 81.1 71.0 88.5 64
63 772 – (705) 799 82.8 73.0 91.4 80.1 69.9 86.5 63
62 746 – (688) 776 82.3 72.2 91.1 79.3 68.8 84.5 62
61 720 – (670) 754 81.8 71.5 90.7 78.4 67.7 82.6 61
60 697 – (654) 732 81.2 70.7 90.2 77.5 66.6 80.8 60
59 674 – 634 710 80.7 69.9 89.8 76.6 65.5 79.0 59
58 653 – 615 690 80.1 69.2 89.3 75.7 64.3 77.3 58
57 633 – 595 670 79.6 68.5 88.9 74.8 63.2 75.6 57
56 613 – 577 650 79.0 67.7 88.3 73.9 62.0 74.0 56
55 595 – 560 630 78.5 66.9 87.9 73.0 60.9 72.4 55
54 577 – 543 612 78.0 66.1 87.4 72.0 59.8 70.9 54
53 560 – 525 594 77.4 65.4 86.9 71.2 58.6 69.4 53
52 544 (500) 512 576 76.8 64.6 86.4 70.2 57.4 67.9 52
51 528 (487) 496 558 76.3 63.8 85.9 69.4 56.1 66.5 51
50 513 (475) 481 542 75.9 63.1 85.5 68.5 55.0 65.1 50
49 498 (464) 469 526 75.2 62.1 85.0 67.6 53.8 63.7 49
48 484 451 455 510 74.7 61.4 84.5 66.7 52.5 62.4 48
47 471 442 443 495 74.1 60.8 83.9 65.8 51.4 61.1 47
46 458 432 432 480 73.6 60.0 83.5 64.8 50.3 59.8 46
45 446 421 421 466 73.1 59.2 83.0 64.0 49.0 58.5 45
44 434 409 409 452 72.5 58.5 82.5 63.1 47.8 57.3 44
ASTEM E 140 TABLE1
Rockwell C
Hardness
Number
150 kgf
(HRC)		 Vickers
Hardness
Number
(HV)		 Brinell Hardness Number*3) Knoop
Hardness,
Number
500-gf and
Over
(HK)		 Rockwell
Hardness Number		 Rockwell Superficial
Hardness Number		 Scleroscope
Hardness
Number*4)		 Rokwell C
Hardness
Number
150 kgf
(HRC)
10-mm
Stabdard Ball,
3000-kgf
(HBS)		 10-mm
Carbide Ball,
3000-kgf
(HBW)		 A Scale,
60-kgf
(HRA)		 D Scale,
100-kgf
(HRD)		 15-N Scale,
15-kgf
(HR 15-N)		 30-N Scale,
30-kgf
(HR 30-N)		 45-N Scale,
45-kgf
(HR 45-N)
43 423 400 400 438 72.0 57.7 82.0 62.2 46.7 56.1 43
42 412 390 390 426 71.5 56.9 81.5 61.3 45.5 54.9 42
41 402 381 381 414 70.9 56.2 80.9 60.4 44.3 53.7 41
40 392 371 371 402 70.4 55.4 80.4 59.5 43.1 52.6 40
39 382 362 362 391 69.9 54.6 79.9 58.6 41.9 51.5 39
38 372 353 353 380 69.4 53.8 79.4 57.7 40.8 50.4 38
37 363 344 344 370 68.9 53.1 78.8 56.8 39.6 49.3 37
36 354 336 336 360 68.4 52.3 78.3 55.9 38.4 48.2 36
35 345 327 327 351 67.9 51.5 77.7 55.0 37.2 47.1 35
34 336 319 319 342 67.4 50.8 77.2 54.2 36.1 46.1 34
33 327 311 311 334 66.8 50.0 76.6 53.3 34.9 45.1 33
32 318 301 301 326 66.3 49.2 76.1 52.1 33.7 44.1 32
31 310 294 294 318 65.8 48.4 75.6 51.3 32.5 43.1 31
30 302 286 286 311 65.3 47.7 75.0 50.4 31.3 42.2 30
29 294 279 279 304 64.8 47.0 74.5 49.5 30.1 41.3 29
28 286 271 271 297 64.3 46.1 73.9 48.6 28.9 40.4 28
27 279 264 264 290 63.8 45.2 73.3 47.7 27.8 39.5 27
26 272 258 258 284 63.3 44.6 72.8 46.8 26.7 38.7 26
25 266 253 253 278 62.8 43.8 72.2 45.9 25.5 37.8 25
24 260 247 247 272 62.4 43.1 71.6 45.0 24.3 37.0 24
23 254 243 243 266 62.0 42.1 71.0 44.0 23.1 36.3 23
22 248 237 237 261 61.5 41.6 70.5 43.2 22.0 35.5 22
21 243 231 231 256 61.0 40.9 69.9 42.3 20.7 34.8 21
20 238 226 226 251 60.5 40.1 69.4 41.5 19.6 34.2 20

*  1) In the table headings, force refers to total test forces.
2)Appendix X1 contains equations converting determined hardness scale numbers to Rockwell C hardness  numbers for non-austenitic steels. Refer to 1.11 before using conversion equatios.
3) The Brinell hardness numbers in parenthese are outside the range recommended for Brinell hardness testing in 8.1 of est Method E10.
4) These Scleroscope hardness conversions are based on Vickers―Scleroscope hardness relationships developed from Vickers hardness data provided by the National Bureau of Standards for 13 steel reference blocks, Scleroscope hardness values obtained on these blocks by the Shore Instruments Mfg. Co., Inc., the Roll Manufacturers Institute, and members of this institute, and also on hardness conversions previously by the American Society for Metals and the Roll Manufacturers Institute.

Metallic materials Conversion of hardness values（DIN EN ISO 18265）

▼The table can be viewed by scrolling horizontally.

■ Conversion of hardness to hardness and hardness to tensile strength for unalloyed and low-alloyed steels and cast steels

DIN EN ISO 18265:2003 (Table A.1)
Tensile
strength
Mpa		 Vickers
hardness
HV 10		 Brinell
hardness
HB*		 Rockwell hardness
HRB HRF HRC HRA HRD HR15N HR30N HR45N
255 80 76.0
270 85 80.7 41.0
285 90 85.5 48.0 82.6
305 95 90.2 52.0
320 100 95.0 56.2 87.0
335 105 99.8
350 110 105
62.3 90.5
370 115 109
385 120 114
66.7 93.6
400 125 119
415 130 124 71.2 96.4
430 135 128
450 140 133 75.0 99.0
465 145 138
480 150 143 78.7 (101.4)
495 155 147
510 160 152
81.7 (103.6)
530 165 156
545 170 162
85.0 (105.5)
560 175 166
575 180 171 87.1 (107.2)
595 185 176
610 190 181 89.5 (108.7)
625 195 185
640 200 190 91.5 (110.1)
660 205 195 92.5
675 210 199 93.5 (111.3)
690 215 204 94.0
705 220 209 95.0 (112.4)
720 225 214 96.0
740 230 219 96.7 (113.4)
755 235 223
770 240 228 98.1 (114.3) 20.3 60.7 40.3 69.6 41.7 19.9
785 245 233 21.3 61.2 41.1 70.1 42.5 21.1
800 250 238 99.5 (115.1) 22.2 61.6 41.7 70.6 43.4 22.2
820 255 242 23.1 62.0 42.2 71.1 44.2 23.2
835 260 247 (101) 24.0 62.4 43.1 71.6 45.0 24.3
850 265 252 24.8 62.7 43.7 72.1 45.7 25.2
865 270 257 (102) 25.6 63.1 44.3 72.6 46.4 26.2
880 275 261 26.4 63.5 44.9 73.0 47.2 27.1
900 280 266 (104) 27.1 63.8 45.3 73.4 47.8 27.9
915 285 271 27.8 64.2 46.0 73.8 48.4 28.7
930 290 276 (105) 28.5 64.5 46.5 74.2 49.0 29.5
950 295 280 29.2 64.8 47.1 74.6 49.7 30.4
965 300 285 29.8 65.2 47.5 74.9 50.2 31.1
995 310 295 31.0 65.8 48.4 75.6 51.3 32.5
1030 320 304 32.2 66.4 49.4 76.2 52.3 33.9
1060 330 314 33.3 67.0 50.2 76.8 53.6 35.2
1095 340 323 34.4 67.6 51.1 77.4 54.4 36.5
1125 350 333 35.5 68.1 51.9 78.0 55.4 37.8
DIN EN ISO 18265:2003 (Table A.1)
Tensile
strength
Mpa		 Vickers
hardness
HV 10		 Brinell
hardness
HB*		 Rockwell hardness
HRB HRF HRC HRA HRD HR15N HR30N HR45N
1155 360 342 36.6 68.7 52.8 78.6 56.4 39.1
1190 370 352 37.7 69.2 53.6 79.2 57.4 40.4
1220 380 361 38.8 69.8 54.4 79.8 58.4 41.7
1255 390 371 39.8 70.3 55.3 80.3 59.3 42.9
1290 400 380 40.8 70.8 56.0 80.8 60.2 44.1
1320 410 390 41.8 71.4 56.8 81.4 61.1 45.3
1350 420 399 42.7 71.8 57.5 81.8 61.9 46.4
1385 430 409 43.6 72.3 58.2 82.3 62.7 47.4
1420 440 418 44.5 72.8 58.8 82.8 63.5 48.4
1455 450 428 45.3 73.3 59.4 83.2 64.3 49.4
1485 460 437 46.1 73.6 60.1 83.6 64.9 50.4
1520 470 447 46.9 74.1 60.7 83.9 65.7 51.3
1555 480 456 47.7 74.5 61.3 84.3 66.4 52.2
1595 490 466 48.4 74.9 61.6 84.7 67.1 53.1
1630 500 475 49.1 75.3 62.2 85.0 67.7 53.9
1665 510 485 49.8 75.7 62.9 85.4 68.3 54.7
1700 520 494 50.5 76.1 63.5 85.7 69.0 55.6
1740 530 504 51.1 76.4 63.9 86.0 69.5 56.2
1775 540 513 51.7 76.7 64.4 86.3 70.0 57.0
1810 550 523 52.3 77.0 64.8 86.6 70.5 57.8
1845 560 532 53.0 77.4 65.4 86.9 71.2 58.6
1880 570 542 53.6 77.8 65.8 87.2 71.7 59.3
1920 580 551 54.1 78.0 66.2 87.5 72.1 59.9
1955 590 561 54.7 78.4 66.7 87.8 72.7 60.5
1995 600 570 55.2 78.6 67.0 88.0 73.2 61.2
2030 610 580 55.7 78.9 67.5 88.2 73.7 61.7
2070 620 589 56.3 79.2 67.9 88.5 74.2 62.4
2105 630 599 56.8 79.5 68.3 88.8 74.6 63.0
2145 640 608 57.3 79.8 68.7 89.0 75.1 63.5
2180 650 618 57.8 80.0 69.0 89.2 75.5 64.1
660 58.3 80.3 69.4 89.5 75.9 64.7
670 58.8 80.6 69.8 89.7 76.4 65.3
680 59.2 80.8 70.1 89.8 76.8 65.7
690 59.7 81.1 70.5 90.1 77.2 66.2
700 60.1 81.3 70.8 90.3 77.6 66.7
720 61.0 81.8 71.5 90.7 78.4 67.7
740 61.8 82.2 72.1 91.0 79.1 68.6
760 62.5 82.6 72.6 91.2 79.7 69.4
780 63.3 83.0 73.3 91.5 80.4 70.2
800 64.0 83.4 73.8 91.8 81.1 71.0
820 64.7 83.8 74.3 92.1 81.7 71.8
840 65.3 84.1 74.8 92.3 82.2 72.2
860 65.9 84.4 75.3 92.5 82.7 73.1
880 66.4 84.7 75.7 92.7 83.1 73.6
900 67.0 85.0 76.1 92.9 83.6 74.2
920 67.5 85.3 76.5 93.0 84.0 74.8
940 68.0 85.6 76.9 93.2 84.4 75.4

*The Brinell hardness values up to 450 HB were determined with the steel ball as the indenter, the higher values with the carbide ball.
NOTE : Values in parentheses are those lying outside the defined range of the standard test method but which may used as estimates.