Hagane is the Japanese term for the steel that forms the hard core and edge of traditional knives. It is used to refer to both carbon steels (such as Shirogami and Aogami) and certain high-quality stainless steels. Hagane is responsible for the knife's cutting ability and durability, and is often wrapped in a softer outer layer (jigane) on laminated knives to provide strength and ease of sharpening.
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Why it matters in a Japanese knife
This concept helps read a product page with more precision: steel affects edge feel, sharpening response, maintenance and the way a knife ages through regular kitchen use.
What to check before buying
Look at steel type, hardness, blade finish and care notes. A balanced choice is not only technical; it also depends on how you cook and how much maintenance you want to take on.