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420HC and S30V make a clear tradeoff: 420HC has much higher toughness, while S30V has substantially greater abrasive edge retention. Their corrosion-resistance ratings are close. The steel name alone therefore does not establish which is the better everyday knife.
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 | CPM S30V |
|---|---|---|
| Abrasive edge retention | ||
| Toughness | ||
| Corrosion resistance |
Heat treatment, hardness and geometry affect actual knives.
S30V for Sustained Abrasive Cutting
S30V rates 6 for abrasive edge retention and 420HC 2.5. We would favor S30V when frequent abrasive cutting is the main task and the knives otherwise suit you equally well.
The score does not judge the initial sharpness or cutting geometry. A well-ground 420HC blade can still be an effective cutter.
Our 420HC steel profile explains its properties and care in more detail.
420HC Has More Toughness
420HC rates 9 for toughness against S30V at 4. That is a meaningful reason to consider 420HC when resistance to edge damage matters more than abrasive wear.
Heat treatment and the maker’s grind are still important. A steel-level rating cannot certify every inexpensive knife that carries the same grade name.
Our S30V steel profile explains its properties and care in more detail.
A Small Corrosion Difference
420HC rates 8 for corrosion resistance and S30V 7.5. This half-point gap is small between two stainless steels, so we would give it less weight than the wear/toughness tradeoff.
The comparison is specifically 420HC. An unspecified 420 blade should not automatically be assigned the same chemistry or ratings.
Choose the Knife Around Its Work
We would take S30V for more abrasive slicing and 420HC when toughness, design and the actual price make it the better fit. Neither material removes the need for a sensible edge and normal care.
If you already have a 420HC knife that suits occasional use, there is no urgent reason to replace it. S30V makes the stronger case when dulling from wear is genuinely limiting the work.
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.
CPM S30V: Reported composition from Larrin Thomas’s July 2026 table, mass %; not a producer specification or batch analysis. This source lists 0.2% nitrogen for S30V; Niagara’s datasheet does not list nitrogen. Knife Steel Nerds: stainless steel composition table (July 2026).
| Element | 420HC | CPM S30V |
|---|---|---|
| Carbon (C) | 0.42% | 1.45% |
| 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% | 14% |
| Nickel (Ni) | ≤0.5% | Not listed |
| Molybdenum (Mo) | Not listed | 2% |
| Vanadium (V) | Not listed | 4% |
| Nitrogen (N) | Not listed | 0.2% |
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
- Knife Steel Nerds: stainless steel composition table (July 2026)
