High-Speed Steel (HSS) vs Aogami Super

Detailed metallurgical comparison between High-Speed Tool Steel and Super Blue Steel.

HIGH-SPEED-STEEL

High-Speed Steel (HSS)

High-Speed Tool Steel

Originally developed for machining applications, HSS (notably M2) has found its way into a niche of Japanese woodworking tools — particularly router bits, drill bits, and some specialty plane blades. Its extraordinary hot-hardness is irrelevant for woodworking, but its fine carbide structure and wear resistance make it compelling for specific applications where conventional carbon steel wears prematurely.

carbon0.78–0.88%chromium3.75–4.50%tungsten5.50–6.75%molybdenum4.50–5.50%vanadium1.75–2.20%
Sharpness
7
Edge Retention
9
Ease of Sharpening
4
Rust Resistance
5
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AOGAMI-SUPER

Aogami Super

Super Blue Steel

The highest-carbon variant among Aogami steels. Includes vanadium and molybdenum for extreme edge retention and hardness. Revered and feared in equal measure — its edge outlasts almost everything, but requires a master's touch to sharpen properly. The pinnacle of the Hitachi carbon steel family.

carbon1.40–1.50%chromium0.30–0.50%tungsten2.00–2.50%vanadium0.30–0.50%molybdenum0.30–0.52%
Sharpness
9
Edge Retention
10
Ease of Sharpening
5
Rust Resistance
4
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