The chart below shows the typical chemical composition and hardness of our high-speed steels. You will find this broken down by our different grades of M2, M3, M4, M7, M42, PM M4, PM T15, PM A11 and PM M48. Click on the individual grade for a complete data sheet of each.
| HIGH SPEED STEEL | ||||||||
|---|---|---|---|---|---|---|---|---|
| (CHEMISTRY OF CONVENTIONAL MATERIAL TO ASTM A600 SPECIFICATIONS) | ||||||||
| Type | TYPICAL CHEMICAL COMPOSITION (%) | HARDNESS | ||||||
| Maximum | Typical | |||||||
| Carbon | Chromium | Tungsten | Molybdenum | Vanadium | Cobalt | Annealed | Tempered | |
| C | Cr | W | Mo | V | Co | Hb | HrC | |
| M2 | 0.83 | 4.15 | 6.15 | 5.1 | 1.95 | - | 255 | 64 |
| M3 | 1.05 | 4.15 | 6.15 | 5.75 | 2.5 | - | 255 | 66 |
| M4 | 1.3 | 4.25 | 5.85 | 4.75 | 4.1 | - | 255 | 65 |
| M7 | 1.02 | 3.8 | 1.8 | 8.6 | 1.9 | - | 260 | 64 |
| M42 | 1.1 | 3.9 | 1.6 | 9.5 | 1.2 | 8.25 | 277 | 67 |
| PM M4 | 1.4 | 4 | 5.65 | 5.2 | 4 | - | 255 | 65 |
| PM T15 | 1.6 | 4 | 12.25 | - | 4.9 | 5 | 275 | 66 |
| PM M48 | 1.5 | 3.75 | 9.75 | 5.25 | 3.1 | 8.5 | 310 | 68 |
| PM A11 | 2.45 | 5.25 | .5 max | 1.3 | 9.75 | .5 max | 255 | 63 |
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