CPM-4V knife steel
CPM-4V is a powder-metallurgy (PM) tool & high-speed knife steel, typically hardened to HRC 60-64.
| Type | Tool & high-speed · powder metallurgy |
|---|---|
| Hardness | HRC 60-64 |
| Edge retention | highhigher than 19 of 48, tied with 17 |
| Corrosion resistance | lowamong the lowest of 49 |
| Toughness | very-highhigher than 40 of 48, tied with 8 |
| Ease of sharpening | hard to sharpenamong the hardest to sharpen of 49 |
| Price tier | Premium |
| Best for | Hard-use / survival |
CPM-4V chemical composition
| C | Cr | Mo | V | Mn | Si |
|---|---|---|---|---|---|
| 1.35 | 5 | 2.95 | 3.85 | 0.4 | 0.8 |
Nominal weight %. Source: Crucible datasheet (Niagara Specialty Metals). What the alloying adds: vanadium (3.85%) gives hard vanadium carbides, the main source of wear resistance.
Knives in CPM-4V
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Similar tool & high-speed steels
| Steel | Type | HRC | Edge | Corrosion | Toughness | Tier | Buy |
|---|---|---|---|---|---|---|---|
| O1 | Tool & high-speed | 57-62 | medium | low | high | Budget | Shop → |
| A2 | Tool & high-speed | 60-62 | high | low | very high | Mid | Shop → |
| D2 | Tool & high-speed | 58-62 | high | medium | medium | Mid | Shop → |
| CPM CruWear PM | Tool & high-speed | 60-64 | high | medium | very high | Premium | Shop → |
| CPM-3V PM | Tool & high-speed | 58-62 | high | medium | very high | Premium | Shop → |
| Vanadis 4 Extra PM | Tool & high-speed | 60-63 | high | low | very high | Premium | Shop → |
All tool & high-speed steels · every steel · best for a purpose