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日立特殊鋼，日本

ATS34

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.
60–61 HRC
555759616365+
ATS-34鋼由日立特殊鋼製造，是日本版的154CM，以其韌性、耐腐蝕和「高速」特性聞名。

154CM最初是為噴射發動機渦輪設計，但在傳奇刀匠Bob Loveless開始用於他的獵刀後，在刀界聲名大噪。此後多年，154CM / ATS34都被許多製刀師認為是頂級鋼材，至今仍是如此。高錳合金提供了延展性、可成形性、加工硬化和強度等特性的良好組合與平衡。
Composition

ATS34 Element Composition

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    ATS34
    —
    13.5% 10.1% 6.8% 3.4% 0
    C Carbon 1.0%
    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
    1.0%
    Cr Chromium 13.5%
    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
    13.5%
    V Vanadium 0.4%
    Forms extremely hard carbides for superior edge retention. Also refines grain structure, improving toughness.
    V
    0.4%
    Mo Molybdenum 4.0%
    Improves hardenability and toughness. Boosts corrosion resistance and helps the steel hold hardness under heat.
    Mo
    4.0%
    Mn Manganese 0.4%
    Aids hardenability and strength. Acts as a deoxidiser during smelting. Excess can reduce toughness.
    Mn
    0.4%
    Si Silicon 0.5%
    Strengthens the steel matrix and acts as a deoxidiser. Improves hardness and resistance to oxidation.
    Si
    0.5%
    P Phosphorus 0.03%
    Impurity from the smelting process. Even small amounts cause brittleness — steelmakers keep this as low as possible.
    P
    0.03%
    S Sulfur 0.03%
    Impurity that reduces toughness and promotes brittleness. Intentionally added only in free-machining steels.
    S
    0.03%
    C — Carbon Cr — Chromium V — Vanadium Mo — Molybdenum Mn — Manganese Si — Silicon P — Phosphorus S — Sulfur
    Hardness 60–61 HRC
    555759616365+
    Steel
    ATS34
    Category
    不鏽鋼
    Manufacturer
    日立特殊鋼，日本
    Hardness
    60–61 HRC

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