A comparison between ZDP 189 and CPM-S110V is a battle between two "super steels" that sit at the absolute peak of edge retention, but they achieve this through very different chemistry.
Performance Comparison
Feature | ZDP-189 | CPM S110V |
|---|---|---|
Carbon Content | 3.0% (Extreme) | 2.8% (Extreme) |
Hardness (HRC) | 64–67 | 61–63 |
Edge Retention | Elite (Finest edge) | Elite (Abrasive resistance) |
Corrosion Resistance | Low (Semi-stainless) | Excellent (High Chromium) |
Toughness | Very Low (Brittle) | Low (Chip-prone) |
Sharpening Difficulty | Extreme | Extreme |
Key Differences
The "Teeth" vs. The "Razor":
CPM S110V is packed with Vanadium (9%) and Niobium (3%), creating hard carbides that act like microscopic serrations. It excels at "slicing" through abrasive materials like rope or cardboard for a very long time. ZDP-189 relies on extreme hardness and high carbon to take a much finer, more "polished" razor edge, but it may lose that initial "scary sharp" feel faster than S110V in dirty environments.Corrosion Resistance:
This is the biggest practical difference. CPM S110V is a true stainless steel with 15% Chromium and high Niobium, making it very rust-resistant. ZDP-189 contains 20% Chromium, but because so much of that Chromium is tied up with the 3% Carbon to form carbides, there isn't enough "free" Chromium left to prevent rust. It behaves more like a semi-stainless and requires oiling.Sharpenability:
Both are a nightmare to sharpen for beginners. However, S110V is notoriously difficult because its Vanadium carbides are harder than the abrasives in many standard stones; you almost must use diamond plates. ZDP-189 is difficult simply because it is physically so hard, making metal removal slow.
Verdict
Choose CPM S110V if you want a set-it-and-forget-it EDC knife that resists rust and keeps a working edge forever through abrasive cutting.
Choose ZDP-189 if you are a "steel nerd" who wants the highest possible hardness and the ability to achieve a mirror-polished, surgical edge, and you don't mind extra maintenance.