420HC (High Carbon) is a higher-carbon version of the standard 420 stainless steel. It is arguably the most famous "workhorse" steel in the American knife industry, largely due to its long association with Buck Knives.
While it is considered a budget-to-mid-range steel today, its performance is highly dependent on the quality of the heat treatment.
Key Characteristics
The "Buck" Standard: 420HC is legendary when paired with the Paul Bos heat treat used by Buck Knives. This process pushes the steel to its absolute limit, making it perform much better than generic 420HC found in cheaper tools.
Excellent Corrosion Resistance: It is a very "clean" stainless steel, making it highly resistant to rust and staining. It is excellent for humid environments, hunting, and fishing.
Great Toughness: It is not a brittle steel. It is very resistant to chipping and snapping, making it ideal for hard-use folding knives and outdoor tools.
Wicked Sharpness: Because it has a very fine grain structure, it can be sharpened to a hair-shaving, razor-like edge very easily.
Moderate Edge Retention: Hardened typically to 56–58 HRC, it holds an edge longer than standard 420 or 420J2, but it will need more frequent sharpening than premium steels like S30V.
Chemical Composition
The "HC" indicates a boost in Carbon compared to the standard 420 series:
Carbon (C): 0.45% – 0.60% (Sufficient for good hardness and edge holding)
Chromium (Cr): 13.00% – 14.00% (Provides the "stainless" quality)
Manganese (Mn): 0.80%
Silicon (Si): 0.60%
Vanadium (V): Trace amounts (Sometimes added to refine grain)
Common Applications
Classic American Knives: Most notably the Buck 110 Folding Hunter and the Buck 119 Special.
Multi-tools: Used by Leatherman (e.g., Wave+, Surge) for their primary blades because it is tough, rust-resistant, and easy for the user to sharpen.
Budget EDC Folders: Used by brands like Gerber and Case for knives that offer reliable daily performance at a lower price point.
Summary: 420HC vs. 12C27
420HC is the American equivalent to the Swedish Sandvik 12C27.
Both are world-class "budget" steels that prioritize toughness, rust resistance, and ease of sharpening over long-term edge retention.