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히타치 특수강, 일본

YXR7

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.
62–65 HRC
555759616365+
YXR7 강은 탁월한 인성과 내마모성으로 알려진 고속도 공구강으로, 주방용 칼에 훌륭한 선택지입니다. 이 강은 높은 탄소 함량과 바나듐, 몰리브덴 등의 합금 원소를 특징으로 하여 경도와 날붙이 유지력을 향상시킵니다.

적당한 탄소 및 크롬 함량 덕분에 사실상 세미 스테인리스강으로서, 탄소강처럼 연마가 쉬우면서도 높은 수준의 관리를 필요로 하지 않습니다.
YXR7의 인성은 일상적인 주방 작업의 요구 사항을 견디며 깨지거나 부러지지 않도록 보장하고, 내마모성은 시간이 지나도 예리함을 유지하여 연마 빈도를 줄여줍니다. YXR7 강으로 제작된 칼은 내구성이 뛰어나고 정밀 절단을 손쉽게 수행할 수 있어 가장 까다로운 환경에서도 만족스러운 성능을 제공합니다.
Composition

YXR7 Element Composition

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    YXR7
    5.0% 3.8% 2.5% 1.3% 0
    C Carbon 0.8%
    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
    0.8%
    Cr Chromium 5.0%
    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
    5.0%
    V Vanadium 1.1%
    Forms extremely hard carbides for superior edge retention. Also refines grain structure, improving toughness.
    V
    1.1%
    Mo Molybdenum 5.0%
    Improves hardenability and toughness. Boosts corrosion resistance and helps the steel hold hardness under heat.
    Mo
    5.0%
    W Tungsten 1.1%
    Forms hard carbides for wear resistance and edge retention. Gives the steel hardness even at elevated temperatures.
    W
    1.1%
    C — Carbon Cr — Chromium V — Vanadium Mo — Molybdenum W — Tungsten
    Hardness 62–65 HRC
    555759616365+
    Steel
    YXR7
    Category
    세미 스테인리스
    Manufacturer
    히타치 특수강, 일본
    Hardness
    62–65 HRC

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