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Stainless Stainless Steel

"Stainless" means stain-resistant, not stain-proof. In kitchen use, the steel can still discolour or pit if exposed to acidic environments — citrus, vinegar, or salt water — for extended periods. Wash and wipe dry after every use, and avoid leaving the blade soaking in water. With basic care, a stainless knife is very low-maintenance and a great everyday choice.
타케후 특수강, 일본

코발트 스페셜 코발트 스페셜 강

Hardness ? Rockwell C Hardness(HRC) measures how resistant a steel is to permanent deformation. For kitchen knives:

55–58 HRC — Soft. Easy to sharpen and forgiving of rough use, but dulls faster. Typical of most German knives.
59–61 HRC — Balanced. Good edge retention with manageable sharpening. Common in mid-range Japanese knives.
62–64 HRC — Hard. Excellent edge retention, holds a very fine edge. Requires more care and a fine stone to sharpen.
65+ HRC — Very hard. Exceptional edge longevity but more brittle — more prone to chipping if used roughly.

Higher is not always better — it depends on how you use and maintain your knife.
60–62 HRC
555759616365+
타케후 특수강의 코발트 스페셜 강은 흔히 코발트강으로 불리며, 뛰어난 절단력 유지와 경도로 유명한 프리미엄 고성능 강재입니다. 이 강재는 조성에 다량의 코발트를 포함하여 내마모성과 강도를 높였습니다. 코발트 외에도 탄소, 크롬, 몰리브덴 등의 원소를 더해 인성을 해치지 않으면서도 높은 경도를 달성할 수 있습니다. 코발트 스페셜 강은 가혹한 사용 환경에서도 오랫동안 날카로움을 유지하도록 설계되어, 고급 주방용 칼과 절삭 도구 제작에 매우 높이 평가됩니다.
모진과 구로사키 같은 장인들이 우수한 COSP 나이프를 선보이고 있습니다.
Composition

코발트 스페셜 Element Composition

Compare with
    코발트 스페셜
    16.0% 12.0% 8.0% 4.0% 0
    C Carbon 1.05%
    Primary hardening element. Raises hardness and wear resistance — but too much increases brittleness and corrosion susceptibility. As a reference: German 1.4112 (~0.5%) sits at the low end; VG-10 (~1.0%) is a common mid-range; SG2 (1.25–1.45%) and ZDP-189 (~3.0%) represent high and extreme ends respectively.
    C
    1.05%
    Cr Chromium 16.0%
    Raises corrosion resistance; 13%+ qualifies steel as stainless. Also improves hardenability and wear resistance. In kitchen use, higher chromium levels contribute to a slight drag or sticking sensation when cutting — a trade-off for the rust resistance it provides.
    Cr
    16.0%
    V Vanadium 0.25%
    Forms extremely hard carbides for superior edge retention. Also refines grain structure, improving toughness.
    V
    0.25%
    Mo Molybdenum 1.5%
    Improves hardenability and toughness. Boosts corrosion resistance and helps the steel hold hardness under heat.
    Mo
    1.5%
    W Tungsten 0.25%
    Forms hard carbides for wear resistance and edge retention. Gives the steel hardness even at elevated temperatures.
    W
    0.25%
    Co Cobalt 2.5%
    Allows higher hardening temperatures, increasing hardness and wear resistance. Slightly reduces toughness at high levels.
    Co
    2.5%
    C — Carbon Cr — Chromium V — Vanadium Mo — Molybdenum W — Tungsten Co — Cobalt
    Hardness 60–62 HRC
    555759616365+
    Steel
    코발트 스페셜
    Category
    Stainless
    Manufacturer
    타케후 특수강, 일본
    Hardness
    60–62 HRC