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Stainless Stainless Steel

"Stainless" means stain-resistant, not stain-proof. In kitchen use, the steel can still discolour or pit if exposed to acidic environments — citrus, vinegar, or salt water — for extended periods. Wash and wipe dry after every use, and avoid leaving the blade soaking in water. With basic care, a stainless knife is very low-maintenance and a great everyday choice.
Aichi, Japan 🇯🇵

AUS-10

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.
58–60 HRC
555759616365+
AUS-10 is a high-grade Japanese stainless steel, superior to AUS-8, known for its excellent toughness, edge retention, and corrosion resistance. With a higher carbon content plus more molybdenum and vanadium, it offers increased hardness and wear resistance. Ideal for premium knives, AUS-10 provides a sharp, durable edge and is favored for its ability to balance high performance with ease of maintenance, making it a top choice for experienced users and quality-conscious manufacturers. It is slightly harder than AUS-8 due to its higher carbon content.
Composition

AUS-10 Element Composition

Compare with
    AUS-10
    13.0% 9.8% 6.5% 3.3% 0
    C Carbon 0.95%
    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
    0.95%
    Cr Chromium 13.0%
    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
    13.0%
    V Vanadium 0.15%
    Forms extremely hard carbides for superior edge retention. Also refines grain structure, improving toughness.
    V
    0.15%
    Mo Molybdenum 0.15%
    Improves hardenability and toughness. Boosts corrosion resistance and helps the steel hold hardness under heat.
    Mo
    0.15%
    Mn Manganese 0.5%
    Aids hardenability and strength. Acts as a deoxidiser during smelting. Excess can reduce toughness.
    Mn
    0.5%
    Si Silicon 1.0%
    Strengthens the steel matrix and acts as a deoxidiser. Improves hardness and resistance to oxidation.
    Si
    1.0%
    P Phosphorus 0.04%
    Impurity from the smelting process. Even small amounts cause brittleness — steelmakers keep this as low as possible.
    P
    0.04%
    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 58–60 HRC
    555759616365+
    Steel
    AUS-10
    Category
    Stainless
    Manufacturer
    Aichi, Japan 🇯🇵
    Hardness
    58–60 HRC

    Frequently asked questions

    AUS-10 steel Japanese knives — good value or budget option?

    AUS-10 is a legitimate, well-regarded stainless steel — not a budget compromise — and the K&S monosteel line shows you can get a properly made AUS-10 knife for around $130–$156 AUD, which is genuinely good value for a knife that holds an edge well and is tough enough for daily use without chipping easily.

    The confusion comes from how AUS-10 sits in the market. It's made by Aichi in Japan, with 0.95% carbon and 13% chromium, plus small amounts of vanadium and molybdenum. That composition puts it a clear step above basic AUS-8 — harder (58–60 HRC), better edge retention, and still very stainless. It's not a "budget" steel like 420 or even some entry-level VG-10; it's a workhorse stainless that many experienced cooks use without complaint. The real value is in the K&S monosteel range: a 180mm Gyuto for $156 AUD or a 150mm Petty for $130 AUD. Those are full stainless, no cladding to worry about, and the heat treat is dialed in for toughness rather than chasing max hardness. For someone who wants a low-maintenance, corrosion-resistant knife that sharpens easily and doesn't feel fragile, that's a smart buy.

    The trade-off is that AUS-10 won't take the screaming edge of a high-carbon white steel or a powder metallurgy stainless like SG2. At 58–60 HRC, it's intentionally kept a bit softer to avoid chipping — that means it won't hold an edge as long as harder steels, but it also won't chip on a chicken bone or a Coreless cut. If you want the absolute best edge retention and are comfortable with more brittle steel, you'd look elsewhere. But if you want a reliable, stainless knife that you can use hard without stress, AUS-10 at these prices is excellent value, not a budget corner cut.

    We trust this information is correct at the time of writing, but it is not an official document and details may change without notice. If you spot an error, tell us and we'll fix it.