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D2 has higher abrasive edge retention, but 420HC is much tougher and more corrosion resistant in these ratings. This is a useful reminder that a familiar budget steel can have genuine strengths. The right choice depends on the edge behavior and care you want.
Performance Ratings
For the science, we turn to Dr. Larrin Thomas of Knife Steel Nerds, who has kindly allowed us to share his ratings here.
| Property | 420HC | D2 |
|---|---|---|
| Abrasive edge retention | ||
| Toughness | ||
| Corrosion resistance |
Heat treatment, hardness and geometry affect actual knives.
D2 Favors Abrasive Slicing
Conventional D2 rates 5 for abrasive edge retention against 420HC at 2.5. We would favor D2 when abrasive dulling is the main limitation.
The score is not a promise of double the cutting time. This comparison also does not substitute CPM D2 for conventional D2.
Our 420HC steel profile explains its properties and care in more detail.
420HC Has a Large Toughness Advantage
420HC rates 9 for toughness and D2 rates 3.5. That favors 420HC when resistance to edge damage matters more than prolonged abrasive wear.
The maker’s treatment and edge design still matter. A high steel rating cannot certify an unspecified knife’s performance.
Our D2 steel profile explains its properties and care in more detail.
420HC Is Easier to Live with Around Moisture
Corrosion resistance is 8 for 420HC and 4.5 for D2. We would choose 420HC when damp carry and lower rust maintenance are priorities.
D2 needs more attention to cleaning, drying and storage. A blade coating does not protect the exposed cutting edge.
Decide Which Compromise Is Useful
Choose D2 for its abrasive-wear advantage if its care and lower toughness suit the job. Choose 420HC for the stronger toughness/corrosion combination.
For occasional everyday cuts, a comfortable 420HC knife can be the more practical purchase. Compare the whole knife rather than treating D2 as an automatic upgrade.
Composition
Our steel composition guide explains the elements and the differences between reported values, ranges and limits.
420HC: Cleveland-Cliffs typical 420HC composition, mass %. P, S and Ni are labeled Max in the table; its footnote says these typical values are not specification limits or a universal grade certificate. Cleveland-Cliffs: Martensitic Stainless Steel Comparator.
D2: Niagara typical composition, mass %; selected elements, not a batch analysis. Niagara Specialty Metals: D2.
| Element | 420HC | D2 |
|---|---|---|
| Carbon (C) | 0.42% | 1.42% |
| Manganese (Mn) | 0.4% | Not listed |
| Phosphorus (P) | ≤0.04% | Not listed |
| Sulfur (S) | ≤0.01% | Not listed |
| Silicon (Si) | 0.5% | Not listed |
| Chromium (Cr) | 12.8% | 11.5% |
| Nickel (Ni) | ≤0.5% | Not listed |
| Molybdenum (Mo) | Not listed | 0.9% |
| Vanadium (V) | Not listed | 0.8% |
Compare Two Knife Steels
Sources and Update Notes
- Dr. Larrin Thomas: knife steel ratings · Property ratings; the scores describe steels rather than individual finished knives.
- Cleveland-Cliffs: Martensitic Stainless Steel Comparator
- Niagara Specialty Metals: D2
