How Knife Steel Names Actually Work — Decoding AUS-8, 8Cr13MoV, VG-10, and More

Knife steel names look cryptic, but most of them follow one of a few real naming conventions tied to where the steel was developed and, in many cases, its actual composition — once you recognize the pattern behind names like AUS-8, 8Cr13MoV, and VG-10, the alphabet soup becomes a lot more readable at a glance.

Chinese steels: the composition is often in the name itself

Steels like 8Cr13MoV follow a naming convention where the numbers and letters directly describe the alloy’s makeup: “8Cr” indicates roughly 0.8% carbon content combined with chromium, “13” refers to the approximate chromium percentage, and “MoV” indicates the presence of molybdenum and vanadium as additional alloying elements. Once you know this pattern, related steels like 9Cr18MoV or 7Cr17MoV become easy to compare at a glance — a higher first number generally suggests more carbon (and typically better edge retention potential), while the chromium number affects corrosion resistance.

Japanese steels: VG, AUS, and other maker/series codes

Japanese steels don’t encode composition directly into the name the way Chinese steels often do. VG-10 (and the newer VG-Max) comes from Takefu Special Steel, with “VG” standing for “V Gold,” a premium stainless line, and the number indicating the generation or variant within that series. AUS-8 (along with AUS-6 and AUS-10) comes from Aichi Steel in Japan, with the number roughly correlating to carbon content and, generally, to edge retention and hardness potential — AUS-10 typically holds an edge longer than AUS-8, but is also more brittle and harder to sharpen.

American steels: often named for their developer or a numeric series

American steels frequently take their name from the company or metallurgist who developed them (S30V and S35VN from Crucible Industries, for instance, where “S” denotes the “Stainless” particle-metallurgy line and the number/letters identify the specific formulation) or from an older industrial numbering system inherited from tool steel classifications, as with D2 (a high-carbon, high-chromium tool steel) or O1 (an oil-hardening tool steel). These names carry less directly readable composition information than Chinese steel names, but they do reliably indicate a steel’s general lineage and intended use case once you know which family a given name belongs to.

European steels: DIN numbers hiding in plain sight

European knife steels often carry German DIN designations that look intimidating but follow their own logical pattern, similar in spirit to the Chinese convention. X50CrMoV15, for example, breaks down as: “X” indicating a high-alloy steel, “50” representing roughly 0.5% carbon content, “CrMoV” listing the alloying elements (chromium, molybdenum, vanadium) in descending order of concentration, and “15” giving the approximate chromium percentage. Once this pattern is familiar, other common European stainless knife steels become easier to place in context alongside their Japanese, Chinese, and American counterparts rather than reading as an unrelated, unrecognizable code.

What the name tells you — and what it doesn’t

• What it tells you: general steel family and lineage, and in the case of Chinese-convention names, a rough sense of carbon and chromium content.
• What it doesn’t tell you: the actual heat treatment applied by a specific knife manufacturer, which affects real-world hardness and edge retention as much as the base alloy itself — two knives using the same steel name can perform differently based on heat treatment alone.
• The practical takeaway: steel name is a useful starting filter, but it’s not a substitute for checking a specific knife’s rated hardness (HRC) and the manufacturer’s reputation for consistent heat treatment.

A common misconception: newer or fancier-sounding names aren’t automatically better

It’s a common assumption that a more exotic-sounding steel name automatically means a better knife, but steel choice is really about matching properties (edge retention, corrosion resistance, ease of sharpening, toughness) to how the knife will actually be used — a budget-friendly steel like 8Cr13MoV with good heat treatment can outperform a premium steel that’s been poorly heat-treated.

Putting steel names into practical buying context

Understanding what a steel name signals is most useful when it’s applied directly to comparing real pocket knife options rather than as an abstract exercise. The Pocket Knife Steel Guide walks through exactly how these naming conventions translate into real-world performance differences across current pocket knife steels, from D2 to modern options like MagnaCut.