Guide to the selection of through hardening steels, based on tensile strength and ruling section
See below for Steel Hardness comparison table
Heat |
Tensile |
Hardness |
Ruling Section |
||||||
<=13mm |
>13 <=19mm |
>19 <=29mm |
>29 <=63mm |
>63 <=100mm |
>100 <=150mm |
>150 <=250mm |
|||
Q |
625-775 n/mm2 |
179-229 |
080M40 |
080M40 |
080M40 |
080M40 |
708M40 |
||
R |
700-850 n/mm2 45-55 TSI |
201-255 |
080M40 |
080M40 |
070M55 |
070M55 |
070M55 |
605M36 |
605M36 |
S |
775-925 n/mm2 50-60 TSI |
223-277 |
070M55 |
070M55 |
070M55 |
070M55 |
605M36 |
709M40 |
709M40 |
850-1000 n/mm2 55-65 TSI |
248-302 |
070M55 |
070M55 |
605M36 |
605M36 |
605M36 |
|||
U |
925-1075 n/mm2 60-70 TSI |
269-331 |
605M36 |
605M36 |
605M36 |
709M40 |
709M40 |
826M40 |
826M40 |
V |
1000-1150 n/mm2 75-80 TSI |
293-352 |
605M36 |
605M36 |
709M40 |
826M40 |
826M40 |
826M40 |
|
W |
1075-1225 n/mm2 80-85 TSI |
311-375 |
708M40 |
709M40 |
826M40 |
826M40 |
826M40 |
826M40 |
Reference should be made to the appropriate standards for yield and impact properties.
For steels required in conditions X, Y or Z, please refer to our Technical Department.
The steels listed above represent the most commonly available grades.
Other specifications exist which fulfil these requirements. Please enquire for other grades.
Steel Hardness comparison table, with equivalent tensile strength*
Hardness no. HB |
Hardness no. HV |
Hardness HRC |
Equiv. UTS n/mm2 |
Hardness no. HB |
Hardness no. HV |
Hardness HRC |
Equiv. UTS n/mm2 |
|
899 856 817 780 745 712 682 653 627 601 578 555 534 514 495 477 461 444 429 415 401 388 375 363 352 341 331 321 311 302 293 285 277 269 262 255 248 241 235 229 |
1150 1050 960 885 820 765 717 675 633 598 567 540 515 494 472 454 437 420 404 389 375 363 350 339 327 316 305 296 287 279 270 263 256 248 241 235 229 |
70 68 66 64 62 60 58 57 55 53 52 50 49 47 46 45 44 42 41 40 38 37 36 35 34 33 32 31 30 29 28 26 25 24 23 22 21 |
3027 2888 2749 2641 2517 2409 2286 2193 2116 2023 1946 1869 1792 1730 1668 1606 1544 1498 1452 1406 1359 1297 1266 1220 1174 1143 1112 1081 1050 1019 988 958 927 911 880 849 834 803 788 772 |
223 217 212 207 201 197 192 187 183 179 174 170 167 163 159 156 152 149 146 143 140 137 134 131 128 126 123 121 118 116 114 111 109 107 105 103 101 99.2 97.3 95.5 |
223 217 212 207 202 197 192 187 183 179 174 170 166 163 159 156 153 149 146 143 140 137 134 131 128 126 124 121 118 116 114 112 109 107 105 103 101 99 97 95 |
20 18 17 16 15 13 12 10 9 8 7 6 4 3 2 1 0 |
757 726 710 695 680 664 649 633 618 610 602 595 587 579 564 556 541 526 517 510 494 486 479 463 456 448 440 432 417 409 402 394 386 378 371 363 355 351 347 340 |
|
Steel Hardness Comparison Table. |
This comparison table is intended as a guide only. The equivalents should be treated with discretion.
*Certain conditions may affect the relationship between hardness and tensile strength.
KV Steel Services is a supplier of quality steel to precision engineering businesses