青紙1号

Aogami #1

Blue Paper Steel #1

High-carbon steel alloyed with chromium and tungsten for enhanced wear resistance and edge retention. Ideal for hard woods and heavy use. Forged by masters who prize its demanding nature, it rewards a skilled sharpener with extraordinary edges that outlast almost any other carbon steel.

Sharpness9/10
Edge Retention9/10
Ease of Sharpening6/10
Rust Resistance4/10
carbon1.25–1.35%chromium0.30–0.50%tungsten1.50–2.00%
Hardness62–65 HRC HRC
Heat TreatmentDemanding — narrow hardening window
Primary UseChisels, plane blades
ManufacturerHitachi Metals (now Proterial)

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