M42
Standard
ASTM A600
Hardness
Annealed ≤269HB, Q&T HRC66-70
Introduction
High-cobalt super-hard HSS with ~8% Co, hardness up to HRC68-70. One of the hardest HSS grades available for extreme cutting conditions. Quenching at 1170-1210°C.
Applications
Super-hard cutting tools, precision wear components, aerospace cutting tools, bearing tools.
Chemical composition
| Element | Min | Max | Unit | Note |
|---|---|---|---|---|
| C | 1.05000 | 1.15000 | % | — |
| Si | 0.15000 | 0.65000 | % | — |
| Mn | 0.15000 | 0.40000 | % | — |
| Cr | 3.50000 | 4.25000 | % | — |
| Mo | 9.00000 | 10.00000 | % | — |
| W | 1.15000 | 1.85000 | % | — |
| V | 0.95000 | 1.35000 | % | — |
| Co | 7.75000 | 8.75000 | % | — |
A dash means not provided, not zero. Confirm specifications before ordering.