ZDP-189 vs Aogami #2

Detailed metallurgical comparison between Hyper Carbon Stainless and Blue Paper Steel #2.

A remarkable Hitachi powder-metallurgy stainless steel with an extraordinary 3% carbon content — the highest of any commercial steel. Achieves hardness levels of 67–69 HRC, creating edges of uncanny keenness with stainless properties. Heat treatment demands extreme precision; it is unforgiving and expensive.

carbon3.00%chromium20.00%tungsten0.60%molybdenum1.30%vanadium0.10%

Sharpness

10

Edge Retention

10

Ease of Sharpening

3

Rust Resistance

9

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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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