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AEB-L remains an appealing choice for a tough, easily maintained cutting edge. Original MagnaCut trades some of that toughness for more abrasive wear resistance and stronger corrosion resistance. For a kitchen knife, fixed blade or everyday folder, the right balance depends on the blade design and how you use it.
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 | AEB-L | CPM MagnaCut |
|---|---|---|
| Abrasive edge retention | ||
| Toughness | ||
| Corrosion resistance |
Heat treatment, hardness and geometry affect actual knives.
Why AEB-L Still Deserves Consideration
AEB-L scores 9 for toughness, compared with original MagnaCut at 7. Its fine carbide structure is part of its appeal for thin cutting edges. We would consider it seriously for a knife designed around clean cutting and regular sharpening, rather than dismissing it because it is an older steel.
A toughness score does not set a safe minimum edge angle. Heat treatment and blade geometry still determine how much support the edge needs. A thin kitchen knife should be used as a kitchen knife, regardless of the steel name.
Our AEB-L steel profile explains the appeal of its fine carbide structure.
MagnaCut Offers More Abrasive Wear Resistance
Original MagnaCut rates 5 for abrasive edge retention and AEB-L 3. For repeated abrasive slicing, we would lean toward MagnaCut if we liked the two knife designs equally.
AEB-L can suit someone who prefers restoring a fine edge regularly. MagnaCut’s hard vanadium and niobium carbides contribute to its wear resistance; diamond or cubic boron nitride abrasives are useful for maintaining it. The table does not measure sharpening speed or initial sharpness.
The MagnaCut steel profile covers the original and newer producer versions.
MagnaCut Is the Stronger Choice Around Moisture
The corrosion ratings are 9.5 for MagnaCut and 7 for AEB-L. That gives MagnaCut an additional advantage when sweat, wet food or damp conditions are a regular part of the job.
AEB-L is still stainless, but it benefits from prompt cleaning and drying. Neither blade should be stored with food residue or moisture on it. The chemistry table alone cannot predict rust resistance by comparing the chromium percentages.
Check Which MagnaCut You Are Comparing
The side-by-side scores here use original MagnaCut. Larrin Thomas’s later Erasteel MagnaCut research found higher toughness, and his written feedback gives that version an 8.5 toughness rating. That narrows the rated toughness gap with AEB-L; it should not be silently substituted for every MagnaCut knife.
For a fine cutting tool that you are happy to sharpen regularly, AEB-L is a worthwhile option. For a knife that needs more abrasive wear resistance and less concern about corrosion, we would favor MagnaCut. When the producer version is not identified, ask the maker rather than assuming the newer result applies.
Composition
Our steel composition guide explains what the elements do and how to read these values.
AEB-L: Uddeholm nominal composition, mass %; phosphorus and sulfur are maximum limits. Uddeholm: UHB AEB-L medical blade strip.
CPM MagnaCut: Niagara typical composition, mass %; selected elements, not a batch analysis. Niagara Specialty Metals: CPM MagnaCut.
| Element | AEB-L | CPM MagnaCut |
|---|---|---|
| Carbon (C) | 0.67% | 1.15% |
| Chromium (Cr) | 13% | 10.7% |
| Silicon (Si) | 0.4% | Not listed |
| Manganese (Mn) | 0.6% | Not listed |
| Phosphorus (P) | ≤0.025% | Not listed |
| Sulfur (S) | ≤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, not a test of these finished knives.
- AEB-L composition reference
- MagnaCut composition reference
- Larrin Thomas: All About AEB-L
- Larrin Thomas: Erasteel MagnaCut testing · The separate numerical 8.5 rating was supplied in written feedback.
