Blue Steel #1: The Ultimate Blade for Professionals

  • Unmatched sharpness and durability—for chefs who demand perfection.

    Blue Steel #1 is revered as one of the finest steels in Japanese knife-making—a material that embodies both precision and endurance. Building on the purity of White Steel, it is enhanced with carefully balanced additions of chromium and tungsten, creating a steel that combines extreme hardness with superior wear resistance. This balance allows chefs to enjoy razor-sharp performance without sacrificing toughness, making it the choice for those who demand both sharpness and reliability.

    In the kitchen, Blue Steel #1 proves itself through experience. Sushi chefs praise its ability to transmit subtle tactile feedback—so precise that each grain of rice can be felt. French chefs admire how effortlessly it glides through delicate lamb loins. With Blue Steel #1, ingredients are not just cut; they are revealed with precision and respect.

    However, this steel is not for beginners. Its hardness requires advanced sharpening skills and attentive care. But for professionals who master its maintenance, it delivers an edge of unparalleled quality—a blade that elevates both technique and cuisine.

    Blue Steel #1 is more than steel; it is a partner. With daily care, it grows alongside the chef, reflecting their dedication and skill. For those who treat cooking as an art, this material offers not only performance but also a profound connection between blade, hand, and heart.

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.