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52100 has more toughness than original MagnaCut, while MagnaCut offers higher abrasive edge retention and much greater corrosion resistance. The choice is between a non-stainless bearing steel with a toughness advantage and a stainless knife steel with a broader wear/corrosion balance.
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 | 52100 | CPM MagnaCut |
|---|---|---|
| Abrasive edge retention | ||
| Toughness | ||
| Corrosion resistance |
Heat treatment, hardness and geometry affect actual knives.
52100 Needs Non-Stainless Care
52100 is not stainless. Moisture and storage habits deserve attention even if a darkened blade or patina does not bother you.
MagnaCut is the easier choice when the knife often stays damp or you prefer less rust maintenance. Stainless still does not mean maintenance-free.
Our 52100 steel profile explains its properties and care in more detail.
Separate Toughness from Wear
52100 rates 8.5 for toughness against original MagnaCut at 7. Abrasive edge retention goes the other way: 52100 rates 2 and MagnaCut 5. Those are different strengths, not an overall quality score.
We would value 52100’s toughness when resistance to edge damage matters most and its care is acceptable. For frequent abrasive slicing, MagnaCut’s higher wear rating is more useful. The maker’s treatment and geometry still affect both.
Our MAGNACUT steel profile explains its properties and care in more detail.
Compare Like-for-Like Knives
A 52100 outdoor fixed blade and a MagnaCut pocket knife may differ far more in design than in any single steel property. Start with the size, grip and blade shape you need.
This comparison uses original MagnaCut’s rating; the separate Erasteel version is explained in the note rather than folded into the same number.
Choose for the Work and the Care
We would lean toward MagnaCut for a versatile knife used around moisture. 52100 is worth considering when a specific design appeals and you are comfortable maintaining a non-stainless blade.
An existing 52100 knife that cuts well and is properly cared for does not need replacing just because another material offers greater corrosion resistance.
Composition
Our steel composition guide explains the elements and the differences between reported values, ranges and limits.
52100: supplier specification; selected reported elements, not an assay of a finished knife. Online Metals: 52100 alloy guide.
CPM MagnaCut: Niagara typical composition, mass %; selected elements, not a batch analysis. Niagara Specialty Metals: CPM MagnaCut.
| Element | 52100 | CPM MagnaCut |
|---|---|---|
| Carbon (C) | 0.93–1.1% | 1.15% |
| Manganese (Mn) | 0.25–0.45% | Not listed |
| Silicon (Si) | 0.15–0.35% | Not listed |
| Chromium (Cr) | 1.4–1.6% | 10.7% |
| Phosphorus (P) | 0–0.025% | Not listed |
| Sulfur (S) | 0–0.015% | Not listed |
| Vanadium (V) | Not listed | 4% |
| Molybdenum (Mo) | Not listed | 2% |
| 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.
- Online Metals: 52100 alloy guide
- Niagara Specialty Metals: CPM MagnaCut
