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154CM has greater abrasive edge retention, while 420HC has much higher toughness and a stronger corrosion rating. If you are moving beyond the labels on the blade, this comparison shows why 154CM is not an upgrade in every direction.
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 | 154CM | 420HC |
|---|---|---|
| Abrasive edge retention | ||
| Toughness | ||
| Corrosion resistance |
Heat treatment, hardness and geometry affect actual knives.
154CM Keeps More Abrasive Wear Resistance
154CM rates 4.5 for abrasive edge retention against 420HC at 2.5. We would favor 154CM for repeated abrasive slicing when the designs are comparable.
These are conventional 154CM ratings. CPM 154 is a separate powder-metallurgy grade with a different toughness rating.
Our 154CM steel profile explains its properties and care in more detail.
420HC Has More Resistance to Fracture
420HC rates 9 for toughness and 154CM 3.5. That makes toughness the largest separation in this pair.
It does not mean every 420HC knife tolerates rough handling. Edge thickness and the intended use remain important to damage resistance.
Our 420HC steel profile explains its properties and care in more detail.
420HC Also Rates Higher for Corrosion
420HC rates 8 for corrosion resistance against 154CM at 7. Both are stainless, but 420HC has the higher rating.
If choosing a knife for damp carry, do not assume the more wear-resistant grade is also the more rust-resistant one.
Wear Resistance Is Only One Benefit
We would take 154CM when abrasive dulling is the main concern. We would favor 420HC when toughness and corrosion resistance are more useful.
A 420HC knife with a good grind and comfortable grip can be a better purchase than an unsuitable 154CM model. Judge the finished knife as well as its material.
Composition
Our steel composition guide explains the elements and the differences between reported values, ranges and limits.
154CM: Selected nominal/typical values, mass %; not a batch certificate or complete analysis. Niagara Specialty Metals: 154CM.
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.
| Element | 154CM | 420HC |
|---|---|---|
| Carbon (C) | 1.05% | 0.42% |
| Chromium (Cr) | 14% | 12.8% |
| Molybdenum (Mo) | 4% | Not listed |
| Manganese (Mn) | Not listed | 0.4% |
| Phosphorus (P) | Not listed | ≤0.04% |
| Sulfur (S) | Not listed | ≤0.01% |
| Silicon (Si) | Not listed | 0.5% |
| Nickel (Ni) | Not listed | ≤0.5% |
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.
- Niagara Specialty Metals: 154CM
- Cleveland-Cliffs: Martensitic Stainless Steel Comparator
