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MagnaCut’s main advantages over conventional 154CM are toughness and corrosion resistance. The abrasive edge-retention gap is small. For someone considering an upgrade, that points to improved resistance to chips and rust rather than a dramatic extension of cutting time.
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.
The toughness score of 7 is for original Crucible MagnaCut. In written feedback to KnifeInformer, Dr. Thomas provided a toughness rating of 8.5 for Erasteel MagnaCut; his January 2026 testing explains the differences between the two versions. This table uses the original version.
| Property | 154CM | CPM MagnaCut |
|---|---|---|
| Abrasive edge retention | ||
| Toughness | ||
| Corrosion resistance |
Heat treatment, hardness and geometry affect actual knives.
Conventional 154CM Is Not CPM 154
The 154CM rating here refers to the conventional material. CPM 154 is a powder-metallurgy version with its own toughness rating, so the names should not be used interchangeably.
If the knife listing says only 154CM, do not assume CPM 154 properties. Confirm the maker’s full designation before comparing its performance claims.
Our 154CM steel profile explains its properties and care in more detail.
A Small Abrasive-Wear Difference
MagnaCut rates 5 for abrasive edge retention against 154CM at 4.5. This half-point gap is small and should not be sold as a major change in how often a particular knife needs sharpening.
If the two knives have different grinds, the geometry can be more noticeable than this material-level wear difference.
Our MagnaCut steel profile explains its properties and care in more detail.
Toughness and Corrosion Are the Stronger Reasons
Original MagnaCut rates 7 for toughness and 9.5 for corrosion resistance; 154CM rates 3.5 and 7. We would favor MagnaCut when both edge damage and damp carry matter.
154CM remains stainless. It does not require the same rust care as a non-stainless tool steel, and a knife that already works well in your routine need not be replaced just because MagnaCut rates higher.
Upgrade for the Right Reason
With equally suitable knives, MagnaCut would be our choice for its broader toughness/corrosion balance. If the 154CM model offers a better fit or design, the small wear gap is not a compelling reason to reject it.
For an existing 154CM owner, ask whether chips or rust are actually causing trouble. Those are the properties where this comparison makes the stronger upgrade case.
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.
CPM MagnaCut: Niagara typical composition, mass %; selected elements, not a batch analysis. Niagara Specialty Metals: CPM MagnaCut.
| Element | 154CM | CPM MagnaCut |
|---|---|---|
| Carbon (C) | 1.05% | 1.15% |
| Chromium (Cr) | 14% | 10.7% |
| Molybdenum (Mo) | 4% | 2% |
| Vanadium (V) | Not listed | 4% |
| Niobium (Nb) | Not listed | 2% |
| 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.
- Niagara Specialty Metals: 154CM
- Niagara Specialty Metals: CPM MagnaCut
