Why Buck's 420HC Outperforms Expectations
420HC is generally considered a budget steel, but Buck Knives' version has a reputation for punching far above its weight class. The secret: the Paul Bos heat treatment process. This article explains why heat treatment transforms 420HC from mediocre to excellent.
420HC Steel Basics
Standard 420HC: 0.46-0.5% carbon, 13% chromium. Typically achieves 55-57 HRC with conventional treatment. Decent corrosion resistance, poor edge retention.
Buck 420HC with BOS treatment: Exact same composition, but achieves 58-59 HRC with superior microstructure. Edge retention comparable to AUS-8 or 8Cr13MoV but with easier sharpening.
The Paul Bos Process
Named after the legendary knifemaker and metallurgist Paul Bos, Buck's heat treatment protocol uses:
- Precise temperature control (±2°F)
- Salt bath quenching for uniform cooling
- Double tempering cycles
- Cryogenic treatment for retained austenite elimination
- Each blade individually processed and verified
This results in a fine carbide structure that maximizes the steel's potential. The process was so effective that Buck licensed it for their blade steel, and the knives consistently test above expected performance.
Real-World Performance
In Buck's 110 Folding Hunter or 119 Special, the BOS-treated 420HC holds an edge notably longer than other 420HC knives. It won't compete with S30V or M390, but for the price ($30-60 typically), the edge retention is exceptional.
Buck's 420HC with BOS heat treatment is proof that steel quality is as much about processing as composition. A $40 Buck knife with BOS-treated 420HC can match or exceed $60 knives with "better" steel but inferior heat treatment. For budget-conscious buyers, Buck represents some of the best engineered value in the knife world.