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AUS-10 is a Japanese stainless blade steel from Aichi Steel, with 0.95–1.10% carbon and 13.00–14.50% chromium. It is a practical choice for kitchen knives and everyday cutting: it can take a fine edge, resists corrosion with ordinary care, and can be sharpened effectively on conventional waterstones. The finished knife’s heat treatment and edge geometry matter as much as the name on the blade.
AUS-10 belongs to Aichi’s AUS family of blade steels, alongside grades such as AUS-6M and AUS-8. Its composition combines relatively high carbon with chromium and small additions of molybdenum and vanadium. Aichi identifies uses for this family that include knives, scissors, and pocket knives.
For a buyer comparing kitchen knives, folders, or custom knives, AUS-10 is one part of the specification. A thin blade with a well-supported edge may cut better than a thicker knife in a more expensive alloy.
AUS-10 is part of Aichi Steel’s Japanese blade-steel range. The AUS family includes AUS-6M and AUS-8, with different carbon contents for different hardness and wear requirements. AUS-10 uses the highest carbon range of those three grades, while retaining their 13.00–14.50% chromium range.
You may encounter AUS-10, AUS10, or AUS-10A in knife specifications. When a maker uses AUS-10A, check its own material description and stated hardness rather than treating the extra letter as proof of an upgraded alloy. The Aichi documents referenced here identify AUS-10 but do not define a separate AUS-10A composition.
If a listing uses a suffix such as AUS-10V, ask for the producer’s material data before treating it as a different steel specification. AUS-10 already contains a small amount of vanadium.
The following values are the composition limits published by Aichi Techno Metal Fukaumi for AUS-10. Percentages are by mass; a maximum is a limit, not a target addition.
Carbon and chromium: Carbon supports hardening and carbide formation. Chromium contributes to corrosion resistance, but some chromium is tied up in carbides. Total chromium content alone cannot tell you how a finished blade will resist staining.
Molybdenum and vanadium: These additions influence the steel’s response to processing and its carbide structure. AUS-10’s 0.10–0.25% vanadium should not be equated with the much larger additions in high-vanadium powder steels. Edge retention comes from the overall alloy, heat treatment, and edge, rather than one element acting alone.
Hardness: Aichi Techno Metal Fukaumi lists a reference quenched-and-tempered hardness of 60 HRC for AUS-10. A maker may choose a different treatment and finished hardness to suit its design.
Edge retention and wear: A well-treated blade can hold a useful working edge, but abrasive wear is only one way it becomes dull. Rolling, small chips, and an incompletely removed sharpening burr can all reduce performance. Neither carbon content nor HRC alone predicts how long a particular knife will keep cutting.
Toughness: AUS-10 does not make a thin cutting edge immune to damage. Dropping a knife, twisting it in a cut, or striking a hard object can chip or break the blade. Edge thickness, angle, and heat treatment affect the result.
Corrosion resistance: AUS-10 is stainless, but it can rust. Salt, food residue, and damp storage still matter. Clean and dry it promptly after food preparation, and rinse off salt before storage.
For knife makers, AUS-10 offers a stainless blade material whose finished performance can be adjusted through heat treatment and geometry. The useful question is how those choices fit the knife’s intended work.
Stock preparation, grinding, and drilling should be distinguished from sharpening a hardened blade. Steel supplied in an annealed condition is softer to work than the finished cutting tool.
AUS-10 can also serve as the cutting core of a laminated blade. In a knife described as “AUS-10 Damascus,” establish which material reaches the edge. Patterned outer layers and the AUS-10 core have different jobs: the visible layer count does not measure edge retention or sharpness.
The blade’s final structure depends on its heat treatment. Aichi Techno Metal Fukaumi lists reference hardening and tempering temperatures of 1,922 °F (1,050 °C) and 356 °F (180 °C), respectively, alongside a reference hardness of 60 HRC for AUS-10. The Aichi tempering data illustrate how hardness changes with treatment. Makers should validate the cycle for their stock and equipment, then check the finished hardness.
Geometry then determines how the steel meets the cut. A thin kitchen blade moves through food with less wedging, while a thicker edge gives more support against damage. A sharp apex can still feel inefficient if the blade behind it is too thick for the task. Conversely, making the edge very thin can sacrifice durability.
Comparisons with other knife steels are most useful when the knives have similar geometry and documented hardness.
AUS-10 and VG10 are Japanese stainless blade steels. Takefu’s representative VG10 composition contains 1.00% carbon, 15.00% chromium, 1.00% molybdenum, 0.25% vanadium, and 1.55% cobalt. Its carbon content therefore overlaps AUS-10’s 0.95–1.10% range.
The higher representative chromium and molybdenum levels and the cobalt addition distinguish VG10 chemically. Both can take a fine edge.
For two chef’s knives, compare the grind, thickness behind the edge, stated hardness, handle comfort, and price. If one wedges through carrots while the other slices cleanly, blade geometry may explain more than the alloy name. If one chips, inspect the edge angle and cutting technique before blaming the entire steel grade.
AUS-10 contains more carbon than AUS-8: 0.95–1.10% versus 0.70–0.80% in Aichi’s published data. Both have the same listed chromium, molybdenum, and vanadium ranges. The extra carbon gives AUS-10 scope for higher hardness and wear resistance with suitable processing.
D2 is a high-carbon cold-work tool steel, rather than a stainless blade steel like AUS-10. BÖHLER’s K110, a D2 grade, has representative values of 1.55% carbon and 11.30% chromium and is designed for wear-resistant tooling.
D2 is attractive for abrasive cutting, but demands more attention to corrosion protection. AUS-10 is the more straightforward choice when stainless behavior matters, particularly around food and moisture.
CPM S35VN is a powder metallurgy stainless steel with substantially more vanadium than AUS-10 and an additional niobium addition. Crucible’s datasheet explains its combination of vanadium, niobium, and chromium carbides. Its wear-resistant carbide system helps explain its appeal for sustained cutting.
AUS-10 remains a practical option when straightforward sharpening and the overall knife’s value matter. S35VN is worth considering for abrasive workloads, especially if you already use suitable diamond or CBN abrasives.
This video compares two popular Japanese stainless steel types: VG-10 and AUS-10. The presenter tests the sharpness, edge retention, and overall performance of two knives made with these steels to determine if there is a noticeable difference in their performance. The video aims to help viewers make an informed decision about which steel is better suited for their needs.
A comparison of two knives reflects those particular blades, edges, and test conditions. It should not be read as a universal ranking of the two steel grades.
Cleaning: For routine knife cleaning and storage, hand-wash with mild dish soap, warm water, and a soft sponge. Rinse and dry promptly, including the area around the handle and any folding mechanism. Do not leave salty or acidic residue on the blade. Avoid the dishwasher and abrasive scouring pads.
Sharpening: Start by matching the existing edge bevel or the maker’s recommended angle. For many ordinary double-bevel kitchen knives, 15–20 degrees per side is a practical starting range, not an AUS-10 specification. That is a 30–40-degree included angle. A very thin or specialized knife may require a different approach.
A medium waterstone around 1,000 grit is a useful starting point for routine dullness. Use a coarser stone for damaged edges or substantial reprofiling; finish with light passes and remove the burr. Diamond and CBN abrasives also work, but are not required simply because the steel is AUS-10. Grit numbers differ among abrasive systems.
Honing: Do not assume a honing rod will repair every dull edge. Light passes on a suitable fine ceramic rod can touch up some edges; chips need sharpening, and a polished steel rod cannot replace metal that is missing. Avoid forceful steeling of thin, hard edges.
Storage and use: Keep the knife dry in a clean block, on a suitable magnetic strip, or in a dry protective sheath. Protect the edge from loose metal utensils, and avoid trapping moisture against the blade. Use food-safe mineral oil for additional protection during extended storage, particularly in a humid environment. For kitchen work, avoid glass cutting boards, bones, frozen food, and twisting the blade sideways.
Judge a knife by its intended work and construction as well as its steel. AUS-10 can suit food preparation, everyday carry, or light outdoor cutting, but the same thin slicing geometry will not suit every task.
Yes, when it is properly treated and used in a suitable design. It is a useful stainless option for kitchen knives and everyday cutting, with practical sharpening requirements. Check the finished knife’s grind, hardness, and build.
VG10 and 440C are comparable alternatives, but neither has the same chemical composition as AUS-10. Compare the finished knife’s hardness, geometry, and intended use when choosing between them.
It can. AUS-10 is stainless, not rustproof. Clean off residue, dry the blade before storage, and give it additional protection during prolonged exposure to moisture or salt.
The label alone does not show that. Check the specific maker’s description and finished hardness. The referenced Aichi documentation does not establish a separate, superior AUS-10A alloy specification.
Decorative cladding does not by itself establish longer edge life. If AUS-10 forms the cutting core, its treatment and geometry determine the behavior of the exposed edge. Compare the core specification and finished blade rather than counting visible layers.
AUS-10 is worth considering when you want a stainless cutting tool that you can maintain with ordinary sharpening equipment. Choose a well-treated blade with geometry suited to your work. That combination is more useful than a steel comparison that ignores how the knife is made.
Manufacturers need to educate themselves better, because there are some truly horrible knives in kitchens, both at home and in restaurants—it’s disgusting. We have the option of Aliexpress, which was and still is the best way to get great knives at prices that fit our budget. A cut made with these knives makes ALL the difference, not to mention speed and safety. I’ve been using a Chinese chef’s knife, which is similar to a cleaver, but also the Japanese kiritsuke, which is almost like a ninja sword, reaching an unmatched level of sharpness and final quality! Congratulations on the article, thank you! Oh, and this steel is the best I’ve seen to this day!
Thanks for a well written and useful article.
The way you build your narratives is captivating, keeping the audience hooked.