HAP40

HAP40は、日立金属が開発した高硬度・高耐摩耗性の粉末ハイス鋼です（HRC 64～68）。優れた切れ味と長い刃持ちが特徴で、炭素やコバルトなどの配合により耐摩耗性と靭性を両立。微細な炭化物が均一に分布しているため、高硬度ながら研ぎやすいのも魅力です。ただし、完全なステンレスではないため、使用後の手入れが必要です。プロの料理人や包丁愛好家に人気の素材です。

HAP40 is a high-hardness, wear-resistant powdered high-speed steel developed by Hitachi Metals (HRC 64-68). It offers exceptional sharpness and edge retention, combining wear resistance and toughness with the addition of carbon, cobalt, and other elements. The uniform distribution of fine carbides makes it surprisingly easy to sharpen despite its high hardness. However, as it is not fully stainless, proper maintenance is required. HAP40 is highly favored by professional chefs and knife enthusiasts.