M51
Standard
ASTM A600
Hardness
Annealed ≤269HB, Q&T HRC64-67
Introduction
High-carbon cobalt-bearing HSS combining excellent toughness with high hardness (HRC64-67). For heavy-duty cutting and cold extrusion requiring both wear and impact resistance. Quenching at 1180-1220°C.
Applications
Heavy-duty cutting tools, punches, cold extrusion dies, gear cutters, broaches.
Chemical composition
| Element | Min | Max | Unit | Note |
|---|---|---|---|---|
| C | 0.95000 | 1.05000 | % | — |
| Si | 0.20000 | 0.45000 | % | — |
| Mn | 0.15000 | 0.40000 | % | — |
| Cr | 3.75000 | 4.50000 | % | — |
| Mo | 4.70000 | 5.20000 | % | — |
| W | 6.00000 | 7.00000 | % | — |
| V | 1.70000 | 2.20000 | % | — |
A dash means not provided, not zero. Confirm specifications before ordering.