炭素工具鋼

SK Steel

Carbon Tool Steel

Broad category of high-carbon steel widely used for general Japanese woodworking tools. Affordable, easy to sharpen, and highly functional, though it lacks the extreme refinement of the Hitachi paper steels. A democratic steel that puts functional tools in every craftsman's hands.

Sharpness7/10
Edge Retention5/10
Ease of Sharpening9/10
Rust Resistance3/10
carbon0.55–1.50%
Hardness55–62 HRC HRC
Heat TreatmentEasy
Primary UseGeneral tools, saws, marking tools
ManufacturerNippon Steel & others

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