Suminagashi - Aogami 2 (Blue Paper Steel)

Japanese Suminagashi (multi-layer steel) with Aogami-2 (Blue Paper Steel) core.
Blue Paper Steel is a tungsten-carbon steel/carbon steel of the highest quality from Japan.

Properties

• Aogami2 steel core
• ~20 layers laminate
• Very high sharpness
• High hardness
• Increased wear resistance due to the addition of chromium/tungsten
• Outer layers significantly softer than the core
• Core becomes dark/black after etching
• Made in Japan

Chemical composition (core Aogami2)

• C: 1,05 - 1,15%
• Cr: 0,20 - 0,50%
• Mn: 0,20 - 0,30%
• Si: 0,10 - 0,20%
• W: 1,00 - 1,50%

Heat treatment / Hardening Aogami2 (Blue Paper Steel)

• Hardening: 790°C - 810°C oil
• Tempering: 2 hours at 200°C
• Hardness: ~62 HRC

Recommendation for etching

High-gloss polish, then immerse in ferric chloride (10% - 15%) for 3-5 minutes

Finish
Laser cut, rolled & annealed