AUS-10 Steel: Hardness, Edge Retention & vs VG-10

The Cooking Guild - Aug 27, 2026

AUS-10 steel shows up on the spec sheet of a lot of Japanese-style kitchen knives, usually with the words "high-carbon stainless" next to it and not much else. That leaves the important questions unanswered. Is AUS-10 actually good? How hard does it get? How does it compare to VG-10, AUS-8 or 440C? And what does it feel like on a cutting board after a month of real cooking? We build our entire Feather Forge line around an AUS-10 core, so we have opinions. Here is the practical guide. The blades we use throughout this guide come from our hand-forged chef knives, each backed by a 99-day home trial and a free lifetime guarantee.

What Is AUS-10 Steel?

AUS-10 is a high-carbon stainless steel produced by Aichi Steel in Japan. It sits at the top of the AUS family (AUS-6, AUS-8, AUS-10), with the number loosely tracking carbon content. Where AUS-8 carries roughly 0.75% carbon, AUS-10 pushes to about 1.0%, which is what lets it be hardened further and hold a keener edge for longer.

Typical composition of AUS-10:

Carbon: 0.95–1.10% — hardness and edge retention
Chromium: 13–14.5% — corrosion resistance (anything over ~10.5% qualifies as stainless)
Molybdenum: 0.10–0.31% — toughness and hardenability
Vanadium: 0.10–0.27% — fine grain structure, a crisper edge
Nickel: up to 0.49% — a little extra toughness
Manganese and silicon under 1% each; sulphur and phosphorus kept very low

The closest Western equivalent is 440C, and metallurgists often describe AUS-10 as "440C with vanadium". That vanadium is the difference you feel: it refines the grain, so the edge comes off the stone finer and stays that way.

AUS-10 Hardness: What HRC to Expect

Properly heat-treated AUS-10 lands at 58–61 HRC on the Rockwell hardness scale. Our Feather Forge blades are hardened to around 60 HRC. That is the sweet spot for a kitchen knife: hard enough to take a 12–15° edge and keep it through weeks of daily prep, but not so hard that the edge micro-chips on a stray bone or a drop into the sink. Push AUS-10 past 61 HRC and you start trading toughness for very little extra edge life; keep it under 58 and it behaves like a much cheaper steel.

Feather Forge 8 inch chef knife with AUS-10 steel core and 73-layer feather Damascus cladding

Is AUS-10 a Good Knife Steel?

Yes, and it is one of the best-balanced steels you can put in a kitchen knife at any price. Here is how it scores on the four things that matter.

Edge retention

Good to very good. AUS-10 will not match a powder-metallurgy super steel like SG2 or S35VN for sheer wear resistance, but it holds a working edge far longer than the 3Cr13, 5Cr15 and X50CrMoV15 steels found in most Western knife blocks. Expect several weeks of home cooking between whetstone sessions, with a quick pass on a honing rod in between.

Toughness

Very good for its hardness. This is where AUS-10 quietly beats VG-10: it is less prone to chipping when it meets something hard, which makes it a more forgiving steel for cooks who are not delicate with their knives.

Corrosion resistance

Strong. With 13–14.5% chromium, AUS-10 shrugs off acidic foods and wet boards. It is not immune (no knife steel is), so rinse and dry after use, but it will not develop a patina the way carbon steel does.

Ease of sharpening

Excellent. AUS-10 responds quickly to a standard whetstone, raises a burr predictably and polishes to a clean, toothy edge. Beginners find it far friendlier than harder super steels that need diamond plates.

AUS-10 vs VG-10

This is the comparison everyone asks about, because both steels are Japanese, both are stainless and both land at roughly 60 HRC. VG-10 (from Takefu) adds cobalt and a touch more chromium, which gives it slightly better wear resistance and edge retention on paper. AUS-10 answers with better toughness and a lower risk of micro-chipping, plus it is easier to bring back on a stone. In daily use the two are close enough that heat treatment and blade geometry matter more than the steel name. If you are hard on your knives, AUS-10 is the safer choice. If you want the last few percent of edge life and you baby your blades, VG-10 edges it.

AUS-10 vs AUS-8

AUS-8 is the softer, cheaper sibling, usually hardened to 57–59 HRC. It sharpens even faster than AUS-10 and is tough enough for pocket knives and budget kitchen knives, but it dulls noticeably sooner. For a knife you use every day, the step up to AUS-10 is worth it: roughly 25% more carbon translates to a meaningfully longer-lasting edge with no real penalty in maintenance.

AUS-10 vs 440C and Other Stainless Steels

Against 440C, AUS-10 is a near match in composition but takes a finer edge thanks to vanadium. Against German X50CrMoV15 (56–58 HRC), AUS-10 is harder, thinner-edged and holds up longer, though the German steel is tougher in an absolute sense. Against Chinese 10Cr15CoMoV, the cobalt-enriched core in our Dynasty Series, the two are close relatives: 10Cr15CoMoV is essentially a VG-10 analogue, so it edges AUS-10 on wear resistance while AUS-10 edges it on toughness.

Why We Use AUS-10 in Feather Forge

A Damascus knife is only as good as its core, because the core is the only steel that ever touches food. The 73 layers of feather-pattern Damascus on a Feather Forge blade do two jobs: they add toughness around the hard core, and the etched surface breaks suction so slices fall away instead of sticking. The AUS-10 core does the cutting.

We chose it over VG-10 for toughness, because a knife with a 99-day home trial has to survive real kitchens, and over budget stainless because we wanted an edge that still bites after a month. The result is a blade that behaves like a Japanese knife on the board and like a Western knife when you forget to baby it.

Feather Forge 8" Chef Knife — the all-rounder
Feather Forge 7" Santoku — shorter, flatter, ideal for smaller boards
Feather Forge 7" Nakiri — the vegetable specialist
Feather Forge 7" Bunka — a santoku with a tip built for precision

Feather Forge complete knife set with AUS-10 steel cores and olive burl handles

How to Care for an AUS-10 Knife

AUS-10 asks very little, but a few habits will keep the edge and the pattern looking new for decades.

Hand wash and dry immediately. Never the dishwasher: the heat, detergent and rattling will damage any fine edge and handle.
Cut on wood or soft plastic. Glass, stone and ceramic boards dull a 60 HRC edge in days.
Hone weekly, sharpen monthly. A ceramic or steel honing rod realigns the edge; a 1000/3000 grit whetstone restores it. Hold 12–15°.
Do not twist through bone. Use a cleaver built for the job and keep the AUS-10 blade for slicing, dicing and chopping.
Store it in a sheath or on a magnetic strip. Loose in a drawer, the edge loses to the other cutlery every time. A knife sheath also protects the Damascus finish.

Try AUS-10 Steel in Your Own Kitchen

Steel charts only get you so far. The way to know whether AUS-10 is the right steel for you is to cook with it. Every Feather Forge knife comes with a 99-day home trial, so you can prep, sharpen and live with the blade before you decide, and each one is backed by a free lifetime guarantee. Explore the full Feather Forge collection or browse all of our Japanese specialty knives.

AUS-10 Steel FAQ

Is AUS-10 a good steel for a chef knife?

Yes. It combines 58–61 HRC hardness, strong corrosion resistance, better toughness than VG-10 and easy sharpening. For a chef knife that gets daily use, it is one of the best-balanced stainless steels available.

What is AUS-10 steel equivalent to?

The closest equivalents are 440C (Western) and VG-10 (Japanese). AUS-10 has a similar carbon and chromium content to 440C with added vanadium, and it performs within a few percent of VG-10 while being tougher.

Is AUS-10 better than AUS-8?

For kitchen knives, yes. AUS-10 has more carbon, hardens higher and holds an edge noticeably longer. AUS-8 is slightly tougher and cheaper, which suits pocket knives and entry-level blades.

Does AUS-10 steel rust?

It is highly rust-resistant thanks to 13–14.5% chromium, but not rust-proof. Rinse and dry after use and it will stay clean; leave it wet for days and small spots can form, which a little baking soda paste removes.

Shop the range: Chef Knives — every blade hand sharpened and oiled before it ships, 99-day home trial, free lifetime guarantee.

Keep reading: Carbon Steel Knife Care: Daily Routine, Rust & Patina