Super Steel: The Future of Japanese Knives

  • Tradition refined by innovation, trusted by chefs worldwide.

    Super Steel represents the future of Japanese knife-making—a material where centuries of tradition meet the science of advanced metallurgy.

    Developed as a semi-stainless steel enriched with molybdenum, chromium, and tungsten, Super Steel combines razor-sharp performance, remarkable durability, and corrosion resistance in one blade. Its secret lies in cutting-edge treatments: vacuum heat treatment ensures uniform hardness without oxidation, while sub-zero processing refines the structure for long-lasting edge retention. The result is a guaranteed HRC62 ±1—hard enough for precision, yet stable enough for everyday reliability.

    For chefs, Super Steel offers the best of both worlds: corrosion resistance for hygiene, sharpness that rivals carbon steels, and a tactile responsiveness that feels natural in hand. Unlike ultra-hard alloys such as ZDP-189, it balances strength with sharpenability, making it practical for both professionals and serious home cooks.

    More than a material, Super Steel is a bridge between past and future—a blade that carries the soul of swordsmiths into the kitchens of tomorrow.
Super Steel

Our Story

  • Tradition of Sakai, in Your Hands

    "Where can I find a truly great knife?"
    We started KIREAJI to answer that question. While the number of skilled craftsmen is declining in Japan, many people overseas are seeking authentic blades. With that in mind, we carefully deliver each knife—bridging tradition and kitchens around the world.
Our Story