日本武生特殊鋼
COSP（鈷特鋼）
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.
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+
武生特殊鋼的鈷特別鋼（Cobalt Special steel），又稱鈷鋼，是一種高性能的頂級鋼材，以其卓越的持久鋒利度與硬度著稱。此鋼材含有大量鈷元素，增強其耐磨性與強度。鈷的加入，搭配碳、鉻、鉬等元素，使得鋼材能在不犧牲韌性的前提下達到極高硬度。鈷特別鋼專為長時間保持鋒利刀刃而設計，即使在高強度使用下也能維持優異表現，因此深受高端廚刀及切割工具製作者青睞。
如 Mojin 與黑崎等刀匠均有優秀的 COSP 產品。
如 Mojin 與黑崎等刀匠均有優秀的 COSP 產品。
Composition
COSP（鈷特鋼） Element Composition
Compare with
COSP（鈷特鋼）
—
16.0%
12.0%
8.0%
4.0%
0
C
1.05%
Cr
16.0%
V
0.25%
Mo
1.5%
W
0.25%
Co
2.5%
C — Carbon
Cr — Chromium
V — Vanadium
Mo — Molybdenum
W — Tungsten
Co — Cobalt
Hardness
60–62 HRC
555759616365+
Knives in COSP（鈷特鋼）
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Kurosaki
黑崎佐雨 COSP Gyuto 240mm
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黑崎佐雨 COSP 文化 170mm
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黑崎佐雨 COSP 三德 170mm
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Kurosaki
黑崎佐雨 COSP Sujihiki 270mm
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Kurosaki
黑崎佐雨 COSP Sujihiki 240mm
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Myojin Riki
明神力鈷特殊鋼牛刀240毫米烏木手柄
Myojin Riki
Myojin Cobalt Special COSP Santoku 180mm 烏木手柄
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Myojin Riki
明神力鈷特殊鋼牛刀210毫米烏木手柄
Myojin Riki