Super Steel: A Masterpiece of Japanese Knife Innovation

  • Meet Super Steel — the next generation of Japanese knife craftsmanship.
    Fusing centuries-old forging spirit with modern heat treatment and material science, this semi-stainless blade offers stunning durability, easy maintenance, and razor-sharp performance trusted by chefs around the world.

Super Steel (Honyaki) Japanese Knife Collection

    KIREAJI's Three Promises to You

    • All Japanese Knives from Sakai City

      1. Exceptional Japanese Knives

      Our knives, crafted by Sakai City's master artisans, combine traditional techniques with carefully selected materials, delivering unrivaled sharpness and durability.

    • 2. For a Lifetime of Use

      At KIREAJI, we see knives as lifelong companions. Each knife comes with a free saya, and we offer Honbazuke hand-sharpening by Shiroyama Knife Workshop in Sakai City.

    • 3. Supporting the Joy of Continued Use

      KIREAJI knives are made to grow with you. That’s why we provide trusted after-sales care (fee-based) .

    Why Many Product Photos Show Only the Blade

    At KIREAJI, every knife is Made to Order.
    That means your knife is completed — handle attached and final adjustments made — only after you place your order, by skilled artisans in Sakai, Japan.

    Made to Order Japanese Knives

    Global Delivery from Sakai

    Across the world, discerning customers seekgenuine Japanese knives crafted in Sakai.
    At KIREAJI, we work alongside the master artisans of Sakai to fulfill that desire — shipping authentic Japanese knives straight from Sakai to kitchens around the globe.

    Global Delivery from Sakai

    Please watch the video to see the exceptional cutting performance of Super Steel(Honyaki)

    Super Steel (Honyaki) Yanagiba(Ultra thin) 300mm -Mirror Polished(one side)
    COLLABORATION: JAPANESE FOOD TECHNOLOGY CHANNEL ON YOUTUBE

    Super Steel (Honyaki) Mukimono 180mm-Mirror Polished(both sides)
    COLLABORATION: JAPANESE FOOD TECHNOLOGY CHANNEL ON YOUTUBE

    Super Steel (Honyaki)

    • Where Craftsmanship Meets Science — What Is Super Steel (Honyaki)?

      A knife is an extension of a chef’s hand.

      When used hundreds, even thousands of times a day, it must be something you can trust.
      That is exactly what the Super Steel (Honyaki) knife is designed for.This knife is a fusion of traditional Japanese “honyaki” forging and modern metallurgy—crafted for professionals who demand the very best.
      It was developed by Shiroyama Knife Workshop, a blacksmithing studio rooted in Sakai, Japan, a city renowned for its cutlery heritage.
      Their proprietary semi-stainless steel achieves a rare balance: exceptional sharpness and ease of use in everyday kitchens.

      Shiroyama Knife Workshop 

    • Sharpness and Durability in One Blade — The Secret Lies in the Heat Treatment

      At the heart of the Super Steel knife is its advanced heat treatment process:
      Vacuum heat treatment and sub-zero processing.In vacuum heat treatment, the steel is heated in an oxygen-free environment and then rapidly cooled.
      This prevents oxidation and creates a uniform internal structure, achieving both the toughness and hardness necessary for long-lasting sharpness.Sub-zero processing follows immediately, where the steel is cooled to temperatures below freezing.
      This crucial step dramatically improves the blade’s dimensional stability and resistance to wear.

      As a result, the knife reaches an impressive HRC62±1 hardness—meaning it can be sharpened with ease, maintains its edge longer, and performs reliably even in the busiest kitchen.

      Sub-Zero Processing 

    • A Knife Trusted by Professionals

      The Super Steel knife is trusted for its cutting performance, longevity, and ease of care—even in high-demand kitchens around the world, from fine dining restaurants to bustling sushi bars.

      Its rust-resistant composition also makes it an ideal companion for passionate home cooks and culinary enthusiasts.
      It captures the elegance of traditional Japanese blades, while meeting the demands of modern cooking environments.

      Chefs Using KIREAJI Knife : Kenshiro Azuma 

    • In the End, a Knife Is More Than a Tool—It’s a Partner

      Once you try it, you’ll feel the difference.
      The sound of the cut, the way the blade enters the ingredient, the tactile response—all of it transforms your connection to the food you prepare.The Super Steel (Honyaki) knife isn’t just a blade.
      It’s a partner that elevates your technique and deepens your relationship with the art of cooking.

    Recommended Users for Super Steel (Honyaki)

    • Professional chefs:

      • Well-suited for professional chefs due to their exceptional sharpness and prolonged edge retention.
      • With their high hardness, they resist chipping and can be sharpened repeatedly, ensuring long-term use.

    • Cooking enthusiasts prioritizing sharpness:

      • Ideal for cooking enthusiasts seeking the sharpest knives available.
      • Suited for those confident in their cooking skills and desiring high-end knives.
    The Japanese Chef’s Way

    Japanese Knife Materials

    In the realm of Japanese knives, the choice of material plays a crucial role in performance and maintenance. This guide delves into the nuances of carbon and stainless steel, including popular variants like White Steel #2 and Blue Steel #2, and newer innovations like ZDP189 and Ginsan.

    Japanese Knife Materials

    Super Steel: The Japanese Craftsmanship That Captivates Professional Chefs

    Explore the allure of Super Steel, a cutting-edge semi-stainless steel developed by Shiroyama Hamono Manufacturing. This steel combines Japan's traditional knife-making techniques with innovative technology, offering chefs unmatched sharpness, durability, and corrosion resistance. Through advanced processes like vacuum heat treatment and sub-zero treatment, Super Steel ensures knives maintain exceptional performance in the most demanding kitchens. This fusion of tradition and innovation continues to inspire chefs worldwide.

    Super Steel

    The Origin of Craftsmanship

    • Carrying the tradition of Sakai, I continue to take on new challenges.

    • In this land where time-honored skills live on, I inherit the legacy of craftsmanship yet fearlessly embrace new challenges. Preserving tradition is important, but as a craftsman, I also believe it is my duty to evolve with the changing times. This balance between honoring the past and adapting for the future is what keeps the spirit of Sakai alive.
    Sakai Traditional Craftsmen Collection