CPM MagnaMax Explained: The Next Evolution in Knife Steel
Posted by Knifeworks on 8th Jul 2026
Just when the knife world settled into CPM MagnaCut as the undisputed king of balanced blade steels, metallurgist Dr. Larrin Thomas struck again. CPM MagnaMax is the next major powder-metallurgy breakthrough — a hyper-focused specialist built for one mission: extreme, long-lasting edge retention without sacrificing stainless properties.
What Is CPM MagnaMax?
Developed by Dr. Larrin Thomas — the same metallurgist behind CPM MagnaCut — alongside Crucible Industries and Niagara Specialty Metals, CPM MagnaMax is a premium powder metallurgy stainless steel built as MagnaCut's high-wear-resistance sibling: essentially a stainless version of CPM 10V or Böhler K390.
By increasing carbon, vanadium, and niobium content, Crucible roughly doubled the total carbide volume compared to CPM MagnaCut — from ~8% up to 16%.
The Microstructure: Like CPM MagnaCut, CPM MagnaMax avoids large, brittle chromium carbides entirely — the chromium fully dissolves into the matrix for strong stain resistance, while a dense, uniform spread of hard vanadium and niobium carbides drives the wear resistance.
CPM MagnaMax vs. the Competition
| Steel Grade | Edge Retention | Toughness | Corrosion Resistance | Hardness (HRC) |
|---|---|---|---|---|
| CPM MagnaMax | Extreme | Moderate-High | Excellent | 63-65 |
| CPM MagnaCut | High | Very High | Excellent | 61-63 |
| CPM S90V | Extreme | Low | Good | 59-61 |
| Böhler M390 / 20CV | High | Low | Excellent | 60-62 |
vs. CPM MagnaCut
Not a replacement — a different tool. CPM MagnaCut stays the more balanced steel; CPM MagnaMax trades some toughness for a real leap in edge retention. In independent CATRA and cardboard-slicing tests, it holds an edge noticeably longer than CPM MagnaCut.
vs. CPM S90V & Böhler M390
S90V and M390 have long been the extreme-edge-retention standard, but both chip more easily. CPM MagnaMax's fine microstructure delivers roughly double the toughness of either while matching or beating them on edge retention and stain resistance.
The takeaway: CPM MagnaMax delivers edge longevity closer to non-stainless heavyweights like Böhler K390 and CPM 10V — with the corrosion resistance of a true stainless steel.
Using and Sharpening It
Run at 63-65 HRC, CPM MagnaMax feels crisp on the stones. No large chromium carbides means no carbide tear-out — though diamond or CBN abrasives are recommended given the hard vanadium/niobium content.
Its toughness allows thin, acute edge geometries (16°-18°) without excessive chipping risk, and its 16% carbide volume performs best with a slightly toothier edge (800-1,200 grit) for aggressive, long-lasting slicing.
Is CPM MagnaMax Right for You?
Heavy prying, chopping, or staple-cutting abuse? CPM MagnaCut is still the better match. Want an elite EDC folder or compact fixed blade that slices for months without a trip to the stones? CPM MagnaMax is worth serious consideration.
It's already earned a place in premium lineups from Spyderco (Manix 2, full flat grind), Pro-Tech (Scapegoat and Synapse 2), and Hogue (Saxum Collector Series) — proof top makers see this steel as here to stay.
Shop CPM MagnaMax knives at Knifeworks — including the Spyderco Manix 2, Pro-Tech Scapegoat & Synapse 2, and Hogue Saxum Collector Series — all in stock from an authorized dealer.