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MagnaMax is a stainless knife steel for people who want more abrasive edge retention than MagnaCut. Its appeal is straightforward: keep cutting through wear-heavy jobs without taking on the rust care of a non-stainless steel such as K390. The tradeoff is lower toughness than original MagnaCut in Dr. Larrin Thomas's ratings.
What Is MagnaMax?
Developed by Dr. Larrin Thomas, MagnaMax builds on MagnaCut's alloy design with more carbon, vanadium and niobium. It is designed to increase abrasive wear resistance while retaining strong corrosion resistance. His development article explains how the design evolved.
Performance Ratings
For the science, we draw on Dr. Larrin Thomas of Knife Steel Nerds, who has kindly allowed us to share his ratings here. Our advice below puts those tradeoffs into everyday cutting and care.
| Property | MagnaMax |
|---|---|
| Abrasive edge retention | |
| Toughness | |
| Corrosion resistance |
Heat treatment, hardness and geometry affect actual knives.
Explore MagnaMax’s Tradeoffs
Choose a steel above to highlight its position and see all three exact ratings below. The full map fits your screen.
Stainless
MagnaMax
- Abrasive edge retention
- 7.5
- Toughness
- 6
- Corrosion resistance
- 9.5
Same position; corrosion ratings may differ:
All 48 rated materials. Numbers group steels at identical coordinates; colors describe stainless classification, not corrosion scores. Neither direction means a universally better knife.
MagnaMax’s ratings are shown above. Enable JavaScript to select another steel, or browse the full ratings table.
Where MagnaMax Makes Sense
Repeated slicing through cardboard is a useful example: an edge can wear dull even when you avoid staples and other hard objects. MagnaMax's abrasive edge-retention rating speaks to that kind of wear. It does not predict how many boxes your knife will cut. For comfortable slicing, pair that wear resistance with a thin, well-ground blade.
More Wear Resistance, Less Toughness Than MagnaCut
MagnaMax is rated 7.5 for abrasive edge retention and 6 for toughness, compared with 5 and 7 for original MagnaCut. Both carry a corrosion rating of 9.5. That balance favors MagnaMax for abrasive slicing and MagnaCut when resistance to chips and cracks is the priority. Thomas's development research explains the material tradeoffs.
Commercial MagnaMax and Early Prototypes
Confirm that a knife is identified as MagnaMax. Thomas describes earlier development batches and explains that the high-carbon prototype used for a Spyderco Mule had lower corrosion resistance than final versions. Do not apply every report about an early prototype to the commercial grade. His later heat-treatment research examines material nearer the middle of the intended specification.
Sharpening and Care
For damage repair or a substantial angle change, diamond or cubic boron nitride (CBN) abrasives are a practical starting point for this wear-resistant steel. A small touch-up may take much less work than restoring a fully dull edge. Match the bevel, use an abrasive that cuts effectively and check that you have removed the burr. Clean and dry the knife after food or wet use; a stainless blade does not make the pivot and hardware rustproof.
What to Check on the Knife
Look for the exact steel, the maker's hardness information and a blade shape that fits your cutting. A comfortable grip and manageable sharpening routine matter as much on a first purchase as on a replacement. Hardness provides useful context, but it does not tell the whole heat-treatment story. Thomas's industrial and custom heat-treatment study explores that distinction. Our knife steel guide helps put the choices in context.
Compare MagnaCut vs MagnaMax in the comparison tool to see their ratings side by side.
Composition
The full formula was withheld in Thomas's January introduction, but his July composition table reports the values shown below. These describe the alloy, rather than a certificate for an individual production batch.
Our steel composition guide explains the elements and how to read these values.
MagnaMax: Reported composition from Larrin Thomas’s July 2026 table, mass %; not a producer specification or batch analysis. Knife Steel Nerds: stainless steel composition table (July 2026).
| Element | MagnaMax |
|---|---|
| Carbon (C) | 2.05% |
| Chromium (Cr) | 10.7% |
| Molybdenum (Mo) | 2% |
| Vanadium (V) | 8% |
| Niobium (Nb) | 2.5% |
| Nitrogen (N) | 0.2% |
Compare Two Knife Steels
Sources and Update Notes
- Dr. Larrin Thomas: MagnaMax development · Development, properties and prototype distinctions. MagnaMax ratings of 7.5 / 6 / 9.5 follow direct feedback from Dr. Thomas dated October 9, 2026.
- Dr. Larrin Thomas: MagnaMax heat treatment
- Niagara Specialty Metals: MagnaMax technical overview
- Dr. Larrin Thomas: rating framework
- Dr. Larrin Thomas: published steel composition table · MagnaMax composition from the embedded stainless-steel composition table, published after the January introduction withheld the full formula. Reported alloy values, not a certified batch analysis.
- Dr. Larrin Thomas: MagnaMax industrial and custom heat treatment · Research comparing industrial and custom heat treatments.
