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S30V and Elmax are close enough that the knife around the steel should usually decide the purchase. S30V has a small abrasive edge-retention lead, Elmax has a small corrosion-resistance lead, and they share the same toughness rating. Neither is a clear all-purpose upgrade over the other.
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 | CPM S30V | Elmax |
|---|---|---|
| Abrasive edge retention | ||
| Toughness | ||
| Corrosion resistance |
Heat treatment, hardness and geometry affect actual knives.
Small Advantages in Opposite Directions
S30V rates 6 for abrasive edge retention and Elmax 5.5. Corrosion resistance goes the other way: Elmax rates 8 and S30V 7.5. These half-point differences are useful context, but we would not promise an obvious difference during ordinary pocket-knife use.
For frequent abrasive cutting, S30V has the higher wear score. For damp carry, Elmax has the higher corrosion score. In either case, a preferred grind or handle is a good reason to choose the other steel.
Our S30V steel profile expands on its abrasive cutting performance.
Toughness Does Not Break the Tie
Both rate 4 for toughness in Thomas’s framework. That does not mean every S30V and Elmax knife has identical resistance to chipping. It means the steel ratings alone do not give either one a toughness advantage.
If you have chipped an edge in one of these steels, switching to the other is not an obvious solution. Check the edge angle and the maker’s intended use, or consider a steel with a more substantial toughness difference.
The Elmax steel profile covers its stainless properties and practical limits.
Buy the Knife You Prefer
If both versions are available in the same design at similar prices, let your use break the tie: S30V for its slight wear advantage, Elmax for its slight corrosion advantage. Otherwise, handle comfort, blade geometry and the maker’s execution deserve more attention.
For someone who already owns a good knife in either steel, swapping solely for the other is unlikely to solve a clearly identified problem. A different blade shape or a better sharpening approach may be the more useful change.
Composition
Our steel composition guide explains what the elements do and how to read these values.
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).
Elmax: Producer-listed typical chemistry, mass %. Uddeholm: Elmax SuperClean.
| Element | CPM S30V | Elmax |
|---|---|---|
| Carbon (C) | 1.45% | 1.7% |
| Chromium (Cr) | 14% | 18% |
| Molybdenum (Mo) | 2% | 1% |
| Vanadium (V) | 4% | 3% |
| Nitrogen (N) | 0.2% | Not listed |
| Silicon (Si) | Not listed | 0.8% |
| Manganese (Mn) | Not listed | 0.3% |
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.
- Knife Steel Nerds: stainless steel composition table (July 2026)
- Uddeholm: Elmax SuperClean
