High-Speed Steel (HSS) vs Aogami #2

Detailed metallurgical comparison between High-Speed Tool Steel and Blue Paper Steel #2.

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-2

Aogami #2

Blue Paper Steel #2

Similar to Aogami #1 but with slightly lower carbon and tungsten content. Offers an excellent balance of edge retention and toughness, making it the most-used steel among Japanese master blacksmiths. The sweet spot of the Aogami family — demanding enough to be worthy, forgiving enough to be reliable.

carbon1.05–1.15%chromium0.20–0.50%tungsten1.00–1.50%
Sharpness
8
Edge Retention
8
Ease of Sharpening
7
Rust Resistance
4
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