MagnaCut vs CPM S45VN

MagnaCut and CPM S45VN both represent the current high-water mark for balanced, no-major-weakness stainless steel, but they arrived at that balance from different directions. MagnaCut was designed from a clean sheet specifically to maximize toughness without sacrificing edge retention or corrosion resistance, while S45VN is a refinement of Crucible’s long-running S-series aimed at pushing edge retention and corrosion resistance to their limit.

Magnacut vs CPM S45VN

Quick Verdict

These two are closer than almost any other pairing in this database. MagnaCut has the edge in toughness, S45VN has the edge in wear resistance, and corrosion resistance is essentially tied at the top of the field. The right choice comes down to which single property you weight slightly higher.

Toughness

MagnaCut is tougher. It was purpose-engineered by Larrin Thomas specifically to push toughness further than steels like the S-series, and it shows even against S45VN, itself already a fairly tough member of that family.

Edge Retention

S45VN pulls ahead here, rated around 143% CATRA edge retention versus 440C, a notch above MagnaCut's already-strong wear resistance. The gap is real but modest.

Corrosion Resistance

Essentially tied at the top of the field. Both use high chromium content and are considered excellent choices for wet, humid, or marine environments.

Heat Treat

MagnaCut was specifically designed to be more forgiving to heat treat, reaching excellent properties with equipment accessible to small shops. S45VN uses an unusual high-temperature double temper (around 600 F) that differs from most other premium stainless steels, and benefits from precise, professional-grade equipment.

Grinding

Comparable. Both are moderately demanding powder-metallurgy steels that grind similarly and are noticeably easier to work than steels like CPM S30V or CPM 20CV.

Best-Use Scenarios

Choose MagnaCut when toughness and chip resistance are the top priority, such as hard-use EDC, hunting, or kitchen knives, and you want a more forgiving shop heat treat.

Choose CPM S45VN when maximum edge retention and corrosion resistance are the top priorities and you have access to precise heat-treating equipment.