420 is a rust-resistant stainless steel with good toughness and easy maintenance. The steel is often used for inexpensive knives, tools, and applications where corrosion resistance is more important than maximum edge retention.
Three Key Characteristics of the Steel: Edge Retention, Rust Resistance, and Sharpenability
Edge Retention: Low to Medium
★★☆☆☆
The low carbon content limits the achievable hardness and wear resistance. As a result, the edge lasts shorter than with higher alloyed knife steels.
Rust Resistance: High
★★★★☆
The high chromium content ensures good corrosion resistance and makes the steel easy to maintain in daily use.
Sharpenability: Very Good
★★★★★
The comparatively low wear resistance allows for easy resharpening with commercially available abrasives.
Areas of Application
Everyday Knives: The good rust resistance and easy maintenance make 420 suitable for simple utility knives.
Tools and Knives with High Moisture Exposure: The steel is used when corrosion protection is more important than maximum cutting performance.
Inexpensive Pocket Knives: The easy machinability and good corrosion resistance enable cost-effective production.
Steel Composition
The exact composition varies depending on the standard and manufacturer. Typical values for AISI 420 are in the range:
| Element | Proportion |
|---|---|
| Carbon (C) | approx. 0.15–0.45 % |
| Chromium (Cr) | approx. 12–14 % |
Products with 420 knife steel
