rpmThe spindle only reaches {max} rpm: the actual cutting speed is {vc} m/min.With this radial engagement the chip gets thinner: to keep the maximum chip thickness equal to fz you can raise the feed up to {fz} mm/tooth.The required power exceeds the spindle power entered: reduce ap, ae or the feed.Deep hole: beyond 5×D use a long drill with internal coolant and a pilot hole.Above 45 HRC you are in ISO group H (hardened steels): dedicated end mills and grades are needed.Value outside the conversion table.steelshardened steelsInserts and end mills for steelEnd mills for hardened steels
INNOT tools
Hardness conversion HRC, HB, HV and Rm
Enter your material hardness in any scale: you get the other scales, the indicative tensile strength and the ISO group to choose the tool.
Value to convert
Conversion between hardness scales is always approximate. Indicative values for unalloyed and low-alloy steels (ISO 18265): not valid for austenitic stainless steels, cast irons, non-ferrous metals and surface-treated materials.
Results
ISO material group
–
Rockwell C (HRC)
–
Brinell (HB)
–
Vickers (HV)
–
Tensile strength (Rm)
–
Conversion table
| HRC | HB | HV | Rm (N/mm²) |
|---|---|---|---|
| – | 95 | 100 | 320 |
| – | 114 | 120 | 385 |
| – | 133 | 140 | 450 |
| – | 152 | 160 | 510 |
| – | 171 | 180 | 575 |
| – | 190 | 200 | 640 |
| – | 209 | 220 | 705 |
| 20.3 | 228 | 240 | 770 |
| 24 | 247 | 260 | 835 |
| 27.1 | 266 | 280 | 900 |
| 29.8 | 285 | 300 | 965 |
| 32.2 | 304 | 320 | 1030 |
| 34.4 | 323 | 340 | 1095 |
| 36.6 | 342 | 360 | 1155 |
| 38.8 | 361 | 380 | 1220 |
| 40.8 | 380 | 400 | 1290 |
| 42.7 | 399 | 420 | 1350 |
| 44.5 | 418 | 440 | 1420 |
| 46.1 | 437 | 460 | 1485 |
| 47.7 | 456 | 480 | 1555 |
| 49.1 | 475 | 500 | 1595 |
| 50.5 | 494 | 520 | 1665 |
| 51.7 | 513 | 540 | 1740 |
| 53 | 532 | 560 | 1810 |
| 54.1 | 551 | 580 | 1880 |
| 55.2 | 570 | 600 | 1955 |
| 56.3 | 589 | 620 | 2030 |
| 57.3 | 608 | 640 | 2105 |
| 58.3 | – | 660 | 2180 |
| 59.2 | – | 680 | 2255 |
| 60.1 | – | 700 | – |
| 61 | – | 720 | – |
| 61.8 | – | 740 | – |
| 62.5 | – | 760 | – |
| 63.3 | – | 780 | – |
| 64 | – | 800 | – |
| 64.7 | – | 820 | – |
| 65.3 | – | 840 | – |
| 65.9 | – | 860 | – |
| 66.4 | – | 880 | – |
| 67 | – | 900 | – |
