PM / 粉末鋼
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
HAP40鋼鋼 粉末高速鋼 HAP40
硬度
洛氏硬度(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.
64–68
HRC
555759616365+
HAP40鋼是一種高速工具鋼，以其卓越的保持性和耐用性聞名，非常適合用於廚刀。其硬度可達68 HRC，能在使用頻繁的情況下仍保持鋒利。HAP40鋼由碳、鉻以及鎢、釩等其他元素組成，兼具硬度與韌性，降低崩刃風險。雖然其優異的耐磨性確保了長期的性能表現，但由於硬度高，研磨HAP40鋼可能需要更進階的工具。這款鋼材特別吸引重視切割效率與低維護需求的廚房刀具愛好者。
成分
HAP40鋼鋼 元素組成
比較對象
HAP40鋼鋼
—
8.0%
6.0%
4.0%
2.0%
0
C
1.3%
Cr
4.0%
V
3.0%
Mo
4.8%
W
6.0%
Co
8.0%
C — 碳
Cr — 鉻
V — 釩
Mo — 鉬
W — 鎢
Co — 鈷
硬度
64–68 HRC
555759616365+
