The primary difference between CPM MagnaCut and CPM-20CV is their performance balance: MagnaCut is a "do-everything" steel that offers exceptional toughness and extreme corrosion resistance, while 20CV is a specialized "super steel" optimized for maximum edge retention. For most users, experts from Knife Steel Nerds consider MagnaCut the superior choice for everyday carry (EDC) because it is much tougher and easier to maintain.
Core Performance Comparison
Feature | CPM MagnaCut | CPM 20CV |
|---|---|---|
Edge Retention | Very Good | Outstanding |
Toughness | Outstanding (Hard to chip) | Low (Relatively brittle) |
Corrosion Resistance | Stellar (Saltwater safe) | Excellent (Stain resistant) |
Sharpening Ease | Moderate-Easy | Difficult |
Best Use | All-around EDC, hard use, marine | High-end slicers, precision tools |
Detailed Breakdown
1. Toughness & Real-World Durability
This is where the two steels diverge most significantly. CPM MagnaCut has about twice the toughness of 20CV.
MagnaCut: Because it is so tough, the edge is highly resistant to chipping or snapping, even when ground thin for better cutting performance.
20CV: This steel is relatively brittle. While it stays sharp a long time, it is more prone to micro-chipping if it hits a staple, bone, or experiences lateral stress.
2. Edge Retention
If your only goal is to go as long as possible without sharpening, CPM 20CV takes the lead.
20CV Performance: It contains a massive amount of hard vanadium and chromium carbides that act like "teeth" to keep cutting through abrasive materials like cardboard.
MagnaCut Performance: It provides edge life similar to S35VN. While it won't out-slice 20CV in a controlled test, its toughness allows for a more acute edge angle, which can make it feel sharper in actual use.
3. Corrosion Resistance
Both are considered high-end stainless steels, but MagnaCut reaches a level of stain resistance near Vanax or LC200N.
MagnaCut: Designed by metallurgist Larrin Thomas, it eliminates chromium carbides so more chromium stays in the "matrix" to fight rust. It is virtually impervious to sweat and saltwater.
20CV: Still offers top-tier rust resistance suitable for most environments, though small pitting spots can occur in extreme salty conditions.
4. Ease of Maintenance
Sharpening: Many users on Reddit find MagnaCut significantly easier to sharpen and strop back to life.
20CV Difficulty: Due to its extreme wear resistance, it is notoriously difficult to sharpen without high-quality diamond abrasives.
Summary Verdict
Choose MagnaCut for a worry-free EDC that can handle accidental abuse, won't rust in your pocket, and is easy to touch up.
Choose 20CV if you primarily perform clean slicing tasks and want the absolute longest edge life possible.