Tamahagane vs Aogami #2

Detailed metallurgical comparison between Jewel Steel and Blue Paper Steel #2.

TAMAHAGANE

Tamahagane

Jewel Steel

The legendary steel produced by smelting iron sand (satetsu) in a traditional tatara furnace over three days. The bloom contains steel at varying carbon levels, which a swordsmiths then separates by eye. For tool use, the finest pieces are laminated into a hard hagane cutting edge. Represents the absolute summit of Japanese metallurgical tradition — both material and art object.

carbon0.60–1.50% (varies through bloom)
Sharpness
10
Edge Retention
8
Ease of Sharpening
9
Rust Resistance
2
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