PM / Powder Steel
Powder Metallurgy (PM)
A modern steel-making process where the alloy is atomised into a fine powder and then compressed under high pressure before sintering. This creates an exceptionally uniform carbide distribution — far finer and more even than conventionally cast steel. The result is a blade that achieves higher hardness without sacrificing toughness, holds a keener edge for longer, and is more resistant to chipping. PM steels are generally considered a step up in performance, though they can be harder to sharpen on coarse stones. 日立特殊鋼，日本
A modern steel-making process where the alloy is atomised into a fine powder and then compressed under high pressure before sintering. This creates an exceptionally uniform carbide distribution — far finer and more even than conventionally cast steel. The result is a blade that achieves higher hardness without sacrificing toughness, holds a keener edge for longer, and is more resistant to chipping. PM steels are generally considered a step up in performance, though they can be harder to sharpen on coarse stones. 日立特殊鋼，日本
ZDP-189
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.
63–66
HRC
555759616365+
ZDP-189鋼是一種高端粉末冶金不鏽鋼，以其卓越的硬度和持久的鋒利度聞名。由日立金屬開發，含有高碳與高鉻，能達到高達67 HRC的硬度，是刀具製作中最硬的鋼材之一。這種極高的硬度讓ZDP-189能磨出極細的刀刃，並能長時間保持鋒利，遠超許多其他鋼材的持久度。然而，高硬度也意味著它較難研磨，若使用不當也較易崩口。ZDP-189的高鉻成分也賦予其一定的抗腐蝕能力，但仍需妥善保養。由於其優異特性，ZDP-189常用於高階及特殊用途刀具，深受重視切割性能與耐用性的專業人士與愛好者青睞。
Composition
ZDP-189 Element Composition
Compare with
ZDP-189
—
20.0%
15.0%
10.0%
5.0%
0
C
3.0%
Cr
20.0%
V
0.1%
Mo
1.4%
W
0.6%
Mn
0.5%
Si
0.4%
C — Carbon
Cr — Chromium
V — Vanadium
Mo — Molybdenum
W — Tungsten
Mn — Manganese
Si — Silicon
Hardness
63–66 HRC
555759616365+
Knives in ZDP-189
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佑成ZDP-189髮絲紋K型牛刀270mm
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佑成ZDP-189髮絲紋K型牛刀210mm
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Sukenari ZDP-189 髮紋K-tip Gyuto 240mm
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助成 ZDP-189 髮絲牛刀 240mm
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初心隼 ZDP189 Migaki Gyuto 240mm
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初心隼 ZDP189 Migaki Gyuto 210mm
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Sukenari ZDP-189 大馬士革 Kiritsuke (K-tip) Gyuto 240mm 樺木瘤柄
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Sukenari ZDP-189 大馬士革牛刀 270 毫米樺木瘤柄
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Sukenari ZDP-189 大馬士革牛刀 240 毫米樺木瘤柄
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Sukenari ZDP-189 大馬士革牛刀 210 毫米樺木瘤柄
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Sukenari ZDP-189 大馬士革 Sujihiki 240 毫米帶 Saya 的樹瘤手柄
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Hatsukokoro