Japanese Knife Steels Explained: White, Blue, VG-10, and SG2
The steel name on a Japanese knife, whether it is Shirogami, Aogami, VG-10, Ginsan, or SG2, tells you roughly how the knife will behave: how long the edge lasts, how fine it gets, and how much rust care it needs. This guide goes through the common Japanese knife steels on five practical measures and says which suits which kind of cook.
What a steel name tells you
Five things vary from steel to steel, and no steel is best at all of them:
- Edge retention. How long the knife stays sharp between sharpenings.
- Sharpness ceiling. How fine an edge the steel can actually take.
- Ease of sharpening. How quickly it responds on a stone, and how clear the feedback is.
- Rust resistance. Whether it needs drying and oiling, or nothing.
- Price. What the steel and its heat treatment add to the knife.
Every steel below is a particular set of trade-offs across those five. Reading a steel name is really reading which compromises the maker chose.
What the alloy elements do
A steel is iron and carbon plus small amounts of other elements, and each one shifts the balance:
- Carbon is what lets steel harden and hold an edge. More carbon, up to a point, means a harder, keener, but more brittle blade.
- Chromium resists rust. Around 11 per cent or more makes a steel “stainless”; less than that and it will patina and spot-rust.
- Vanadium and tungsten form hard carbides that improve wear resistance, so the edge lasts longer, at the cost of slower sharpening.
- Molybdenum and cobalt help the steel stay strong when hard and widen the window for a good heat treatment.
You do not need to memorise this. It is enough to know that “holds an edge longer” and “quick and easy to sharpen” pull against each other, and the alloy recipe is where a maker picks a point between them.
Carbon steels: White and Blue
White steel (Shirogami) is a very pure carbon steel, almost nothing but iron and carbon. That purity gives it the finest, crispest edge of the common knife steels and makes it a pleasure to sharpen, with quick, clear feedback on the stone. The costs are low wear resistance, so the edge dulls sooner, and fast rusting if it is left wet. It comes in grades: White #1 has slightly more carbon for a keener edge, White #2 is a little tougher and the more common choice.
Blue steel (Aogami) is White steel with tungsten and chromium added. The edge lasts noticeably longer, and the wider hardening range makes it more forgiving for a smith to heat-treat well. It still rusts and still takes a patina. Blue #2 is the everyday version; Blue #1 has more carbon. Aogami Super pushes the alloy and the hardness further again, for excellent edge retention and a little more chipping risk, and it is often clad in stainless and sold as a low-maintenance “semi-stainless” knife.
Carbon steel is for a cook who sharpens often and dries the blade every time. Our carbon versus stainless guide covers whether that routine is for you.
Everyday stainless: VG-10 and AUS-10
VG-10 is the workhorse of mid-range Japanese knives. It is a stainless steel usually run around 60 to 61 HRC, takes a keen edge, holds it reasonably, and shrugs off rust with no care at all. It is almost always used as a clad core. On the stone it can feel a touch sticky and less crisp than carbon, but the edge it gives is genuinely sharp.
AUS-8 and AUS-10 are softer, cheaper stainless steels found on budget knives. They dull sooner than VG-10 but are quick and easy to bring back, which makes them forgiving for a first knife. Molybdenum-vanadium steels like 8Cr13MoV and X50CrMoV15 sit here too: fine for the money, and what most sub-USD-60 “Japanese-style” knives actually use.
Tojiro Fujitora DP Gyuto 210mm
USD 119 (checked Sep 9, 2026)
- VG-10 core at 60 HRC takes and holds a keen edge — a long-standing first-knife recommendation
- Stainless cladding and a water-resistant handle make it low maintenance
- Widely regarded as one of the best-value entry points into Japanese knives
The gyuto above is a VG-10 core at 60 HRC, clad in soft stainless: a long-standing first-Japanese-knife recommendation for the balance it strikes.
Stainless that sharpens like carbon: Ginsan
Ginsan (Silver 3) is a Japanese stainless with a structure that behaves much like carbon steel on the whetstone. It takes a fine edge, gives clear feedback, and does not feel slow the way some harder stainless steels do, while still resisting rust.
Makers often use Ginsan for single-bevel and traditional shapes that were once carbon only. It is the steel to look for if you want the carbon sharpening experience without the drying-and-oiling routine.
Powder steels: SG2 and ZDP-189
SG2, and the near-identical R2, are made from fine metal powder that is pressed and sintered. The even, fine grain takes a keen edge and holds it far longer than VG-10, usually at 62 to 64 HRC, while staying fully stainless. The costs are a higher price and an edge that is slower to resharpen and wants good stones.
ZDP-189 is a powder steel taken further, often 64 to 67 HRC. Its edge retention is exceptional and its demands match: it chips if mishandled and takes real skill and good stones to sharpen. HAP40 and SRS-15 are other powder steels in the same territory, and the non-stainless tool steels SKD and SLD behave like a very hard, wear-resistant Blue Super. Our guide to what HRC means covers that end of the scale.
Yoshida Hamono ZDP-189 Santoku Black 180mm
EUR 300 (checked Sep 8, 2026)
- ZDP-189 with roughly 20% chromium resists corrosion better than typical carbon steel
- San-mai (clad) construction keeps the core thin for a fine, long-lasting edge
- Versatile enough for meat, fish, and vegetables in one blade
Monosteel or clad
Steel is only half the story; how it is built into the blade is the other half. Most Japanese knives are clad, or san-mai: a thin core of the named steel is forge-welded between two layers of softer, tougher stainless or iron. You only sharpen the small strip of hard steel at the edge, the outer layers add toughness and, if they are stainless, rust resistance, so a carbon core can sit behind a low-maintenance stainless body.
A monosteel knife is a single piece of the named steel throughout; the traditional water-quenched version is called honyaki. It is harder to make, less forgiving of a knock, and usually more expensive, and it is mostly found on traditional single-bevel knives. For a double-bevel kitchen knife, clad is the norm and there is no reason to seek out monosteel.
A quick reference
| Steel | Type | Edge retention | Sharpening | Rust resistance |
|---|---|---|---|---|
| Shirogami (White) | Carbon | Low-moderate | Easiest, crispest | Poor |
| Aogami (Blue) | Carbon | Moderate-high | Easy | Poor |
| Aogami Super | Carbon | High | Moderate | Poor |
| AUS-8 / AUS-10 | Stainless | Low-moderate | Easy | Good |
| VG-10 | Stainless | Moderate | Moderate, slightly sticky | Very good |
| Ginsan | Stainless | Moderate | Easy, carbon-like | Very good |
| SG2 / R2 | Powder stainless | High | Slow, needs good stones | Very good |
| ZDP-189 | Powder stainless | Very high | Slowest, skill needed | Good |
How much does the steel actually matter?
Less than the name-dropping suggests. Two things outside the steel choice matter as much or more.
Heat treatment decides where a steel actually lands. The same Blue steel is run soft and forgiving by one workshop and hard and chippy by another, so a maker’s reputation for heat treatment counts for as much as the steel on the label. Our HRC guide covers this.
Blade geometry decides how the knife cuts day to day. A thick knife in a famous steel wedges through food; a thin, well-ground knife in a plain steel glides. Thickness behind the edge and the quality of the grind come before the steel name when you compare two knives.
A well-made VG-10 knife from a good maker will outperform a poorly heat-treated Aogami one. Buy the maker and the grind first, and treat the steel as a tie-breaker.
Which steel should you choose?
- You want the lowest maintenance: VG-10 or AUS-10.
- You want carbon-like sharpening without the rust care: Ginsan.
- You sharpen well and want the fewest sessions: SG2, or ZDP-189 if you are careful with the blade.
- You sharpen often, dry every time, and want the finest edge: Shirogami or Aogami.
- You are not sure: VG-10. It is the default for a reason.
Our guide to choosing a first Japanese knife puts the steel choice next to the other decisions.
Frequently asked questions
What is the best steel for a Japanese knife?
There is no single best. Carbon steels like White and Blue take the finest edge and sharpen easily but rust. VG-10 and Ginsan are low-maintenance all-rounders. SG2 holds an edge longest among practical stainless steels. Match the steel to how much care and sharpening you want to do.
Is VG-10 good steel?
Yes. VG-10 is a well-balanced stainless: a keen edge, reasonable edge retention, strong rust resistance, and easy enough to sharpen. It is the standard steel in mid-range Japanese knives and a common first-knife choice.
White or blue steel?
Blue steel holds an edge longer and is a little more forgiving to heat-treat and to own. White steel takes a marginally finer edge and is the easier of the two to sharpen. For a carbon knife you actually use, most cooks prefer Blue.
Is SG2 better than VG-10?
SG2 holds an edge longer and can take a slightly finer one, because its powder structure has a finer grain. It also costs more and is slower to resharpen. VG-10 is the better all-rounder for most home cooks; SG2 rewards someone who sharpens well.
Does the steel name matter most?
No. Heat treatment and blade geometry affect how a knife performs as much as the steel does. A well-made knife in a modest steel beats a poorly made one in a famous steel. Use the steel name as a tie-breaker, not the first filter.
The short version
A Japanese knife’s steel name is shorthand for its trade-offs. Carbon steels, White and Blue, give the finest edge and the easiest sharpening but rust without care. Everyday stainless, VG-10 and Ginsan, gives up a little edge feel for no rust worry. Powder steels, SG2 and ZDP-189, hold an edge far longer at a higher price and with harder sharpening. None of it matters as much as the maker’s heat treatment and the blade’s geometry, so for a first knife pick a stainless steel and a good maker, and read our guide to choosing a first Japanese knife for the rest.