Japanese Knife Steel Types: Aogami, Shirogami, VG10 and More
The Short Version
- Three steel families: carbon (Shirogami, Aogami), stainless (VG-10, Ginsan), and powdered (SG2/R2, ZDP-189).
- Carbon: sharpest edge, easiest to sharpen, rusts if you don’t dry immediately. Stainless: corrosion resistant, needs less babying, slightly harder to sharpen.
- Powdered: extreme hardness + stainless, but the hardest to sharpen at home.
- No “best steel.” The right one depends on how you cook and how much maintenance you’ll do. VG-10 for low maintenance, Aogami Super for performance chasers who sharpen.
Why Steel Matters More Than You Think
When people talk about a “good knife,” they usually mean the steel. The blade shape matters, the handle matters, the grind matters. But steel determines the three things you’ll notice most over time: how sharp it gets, how long it stays sharp, and how easy it is to sharpen when it dulls.
Japanese bladesmiths have access to some of the most refined knife steels in the world, produced by specialists like Proterial Ltd. (formerly Hitachi Metals) and Takefu Special Steel Co. These aren’t generic metals. They’re purpose built alloys designed for blades, each with a specific balance of hardness, toughness, and corrosion resistance.
If you’ve already read What Makes Japanese Knives Special, you know that Japanese knives run harder than Western ones, typically 60 to 67 HRC compared to 54 to 58 HRC for German knives. That hardness comes from the steel. And different steels achieve it in different ways.
The Three Families
Every Japanese knife steel falls into one of three categories. Once you understand the trade offs in each family, picking the right one gets much simpler.
Carbon Steel (Hagane)
Carbon steel is the traditional choice. Japanese bladesmiths have been forging with it for centuries, and for pure cutting performance, nothing else comes close.
Carbon steels are essentially iron with carbon added. No chromium to speak of, which means no corrosion resistance. They will rust if you leave them wet. They will develop a patina (a dark, harmless discoloration) as you use them. This isn’t a flaw. It’s the nature of the material.
The trade off is worth it for many cooks: carbon steels sharpen faster, take a keener edge, and give feedback on the stone that stainless steels can’t match. If you enjoy the ritual of sharpening, carbon is where you’ll find the most satisfaction.
Two families dominate: Shirogami (White Steel) and Aogami (Blue Steel). Both are produced by Proterial at their Yasugi factory in Shimane Prefecture, and they’re named for the color of the paper they were traditionally wrapped in.
Shirogami (White Steel)
Shirogami is as close to “pure” carbon steel as you’ll find in a kitchen knife. It’s iron, carbon, and very little else.
Shirogami #2 is the more common grade. It has roughly 1.05% to 1.15% carbon and typically hardens to 60 to 64 HRC. It sharpens beautifully, almost effortlessly, and takes an extremely keen edge. The downside is that edge doesn’t last as long as harder or more alloyed steels. Professional sushi chefs often prefer it because they sharpen daily anyway, and nothing else matches that clean, precise bite through fish.
Shirogami #1 has more carbon (around 1.25% to 1.35%) and reaches 63 to 67 HRC. It holds an edge longer than #2 but is slightly more brittle and a touch harder to sharpen. It’s less common in kitchen knives and more often found in specialty blades.
Who it’s for: Cooks who sharpen regularly and value the sharpest possible edge. Traditionalists. Anyone who treats knife maintenance as part of the cooking process, not a chore.
Knives to look at: Mazaki Kasumi Gyuto 210mm in Shirogami #2 is a standout at the premium tier. For traditional single bevel work, Sakai Takayuki Kasumi Yanagiba 270mm and Sakai Takayuki Kasumi Deba 165mm both use Shirogami #2 with excellent results.
Aogami (Blue Steel)
Aogami starts with the same base as Shirogami but adds small amounts of tungsten and chromium. Not enough chromium to make it stainless (it will still rust), but enough to meaningfully improve edge retention and toughness.
Aogami #2 has roughly 1.05% to 1.15% carbon and sits around 62 to 65 HRC. It holds an edge longer than Shirogami #2, resists chipping a bit better, and develops a patina more slowly. It’s a solid middle ground for cooks who want carbon steel performance without the most demanding maintenance schedule.
Aogami Super takes it further with additional carbon (around 1.4% to 1.5%) and vanadium. This pushes hardness to 63 to 66 HRC with significantly better edge retention than either standard Blue Steel. It’s one of the most popular high performance carbon steels in Japanese knives right now, and for good reason: it holds an edge impressively well while still being possible to sharpen at home with decent stones.
Who it’s for: Performance focused cooks who want long lasting sharpness and don’t mind wiping the blade after each use. Home cooks who sharpen every few weeks rather than every few days. Professional line cooks who need an edge that survives a full service.
Knives to look at: Masakage builds excellent Aogami Super knives. The Masakage Koishi Gyuto 210mm features an AS core clad in stainless with a kurouchi finish. Munetoshi also makes a well regarded Munetoshi Kurouchi Gyuto 210mm in Aogami Super at a more accessible price. (Note: the Masakage Yuki line uses Shirogami #2, not Aogami Super.)
Stainless Steel
Stainless steels contain enough chromium (generally 12% or more) to resist corrosion. You still shouldn’t throw them in the dishwasher, but they won’t rust if you leave a tomato stain on the blade for a few minutes.
The trade off has historically been sharpening. Stainless steels tend to be more stubborn on the stones, and some feel “gummy” compared to the crisp feedback of carbon. That gap has narrowed significantly with modern alloys, but it still exists.
VG-10
VG-10 (V Gold 10) is the workhorse of Japanese stainless knives. Made by Takefu Special Steel, it contains about 1.0% carbon and 15% chromium, typically hardened to 60 to 62 HRC. It’s not the hardest steel on this list, and it’s not the easiest to sharpen. But it does everything reasonably well: good edge retention, good corrosion resistance, manageable sharpening, and it takes a respectably sharp edge.
There’s a reason VG-10 shows up in more Japanese knives than any other steel. It’s the safe choice, and “safe” isn’t an insult here. For most home cooks who sharpen a few times a year and want a knife that performs without constant attention, VG-10 delivers.
Who it’s for: Home cooks who want quality without fuss. Anyone buying their first Japanese knife. People who don’t want to think about patina or rust.
Knives to look at: Tojiro’s DP line is the classic budget entry. The Tojiro DP Gyuto 210mm is one of the most recommended starter Japanese knives for a reason: solid VG-10 performance at a price that makes it easy to try. Shun’s Classic series (Shun Classic Gyuto 200mm, Shun Classic Santoku 175mm) wraps VG-10 in a Damascus clad package. Sakai Takayuki offers the Sakai Takayuki 45-Layer Damascus Gyuto 210mm at the mid tier.
VG-1
VG-1 is VG-10’s simpler sibling. Slightly less carbon, slightly softer, a bit easier to sharpen. It shows up mainly in budget knives and performs admirably for the price.
Fujiwara FKM’s lineup uses AUS-8 molybdenum vanadium stainless steel, which sits in similar budget territory. The Fujiwara FKM Gyuto 210mm is a strong recommendation for anyone who wants a no nonsense entry level Japanese knife.
Ginsan (Silver #3)
Ginsan is the steel that tries to bridge carbon and stainless, and it gets remarkably close. Produced by Proterial, it has the chromium content to resist corrosion but sharpens with a feel much closer to carbon steel. Cooks who love how carbon steels respond on the stone but hate dealing with rust often land on Ginsan.
It’s less common than VG-10 or the carbon steels, which can make it harder to find, but worth seeking out.
Who it’s for: Experienced cooks who want stainless convenience with carbon like sharpening. A great “best of both worlds” option.
Knives to look at: The Ashi Ginga Gyuto 210mm is one of the most respected Ginsan knives available. Tanaka Ginsan Gyuto 210mm and Tanaka Ginsan Nakiri 165mm offer Ginsan at a more accessible mid tier price.
AUS-10 and Other Stainless Steels
AUS-10 is a solid stainless steel comparable to VG-10, used by some manufacturers as a less expensive alternative. You’ll also encounter steels like AUS-8 (softer, more budget focused) and various proprietary blends. They’re all serviceable. None of them are bad. They just sit at different points on the hardness/maintenance spectrum.
Powdered Steel (Powder Metallurgy)
Powdered steels represent the cutting edge (literally) of knife metallurgy. Instead of melting and casting, the steel is atomized into a fine powder, then consolidated under heat and pressure. This produces an extremely uniform grain structure, which translates to a blade that can be hardened further while remaining relatively tough.
SG2 / R2
SG2 (also marketed as R2) is the most popular powdered steel in Japanese kitchen knives. Made by Takefu Special Steel, it has roughly 1.25% to 1.45% carbon and 14% to 16% chromium. It hardens to 63 to 65 HRC, which is firmly in carbon steel territory while being fully stainless.
Edge retention is where SG2 shines. Knives in this steel stay sharp noticeably longer than VG-10, and they won’t rust. The catch is sharpening. SG2 is harder to work on stones than carbon steel or VG-10. It’s not impossible by any means, but it takes more time and pressure, and you’ll want quality stones (1000 grit and above).
Who it’s for: Cooks who want the longest edge life in a stainless package and are comfortable sharpening on whetstones. People who’d rather sharpen less often, even if each session takes a bit longer.
Knives to look at: Takamura’s R2 line is legendary for value. The Takamura R2 Gyuto 210mm is thin, light, and screaming sharp out of the box. Yu Kurosaki’s Senko and Fujin series (Yu Kurosaki Senko SG2 Gyuto 210mm, Yu Kurosaki Fujin SG2 Gyuto 210mm) are premium showpieces that perform as well as they look. Miyabi’s Miyabi Birchwood SG2 Gyuto 200mm offers SG2 in a Western handled, widely available package.
ZDP-189
ZDP-189 is the extreme end of powdered steel. Produced by Proterial, it contains roughly 3% carbon and 20% chromium, and can be hardened to 64 to 67 HRC. Edge retention is extraordinary. A well maintained ZDP-189 blade can go weeks of regular home use between sharpenings.
The flip side: it’s genuinely difficult to sharpen. You need high quality stones and patience. Some users resort to diamond plates for the initial stages. It’s also more brittle at these hardness levels, so it’s not a steel for careless cutting technique.
Who it’s for: Enthusiasts who prioritize maximum edge retention above all else and have the sharpening skills (or willingness to develop them) to maintain it.
Knives to look at: The Sukenari ZDP-189 Gyuto 210mm is one of the few widely available options and a good representation of what this steel can do.
Semi Stainless: SKD
SKD deserves a mention as an outlier. It’s a tool steel with some chromium, enough to slow down corrosion significantly but not enough to be truly stainless. It behaves more like a carbon steel on the stones (pleasant to sharpen) while being much more forgiving about moisture than Shirogami or Aogami.
Yoshikane’s SKD knives (Yoshikane SKD Gyuto 210mm, Yoshikane SKD Gyuto 240mm) are well loved in the knife community for exactly this reason. They occupy a practical middle ground that doesn’t fit neatly into any category.
Steel Comparison Table
| Steel | Family | Typical HRC | Edge Retention | Ease of Sharpening | Corrosion Resistance | Price Tier |
|---|---|---|---|---|---|---|
| Shirogami #2 | Carbon | 60 to 64 | Moderate | Very Easy | None (rusts) | Mid to Premium |
| Shirogami #1 | Carbon | 63 to 67 | Good | Easy | None (rusts) | Premium |
| Aogami #2 | Carbon | 62 to 65 | Good | Moderate | Very Low (patina) | Mid to Premium |
| Aogami Super | Carbon | 63 to 66 | Very Good | Moderate | Very Low (patina) | Mid to Premium |
| VG-1 | Stainless | 58 to 61 | Moderate | Easy | High | Budget |
| VG-10 | Stainless | 60 to 62 | Good | Moderate | High | Budget to Mid |
| Ginsan | Stainless | 60 to 63 | Good | Easy to Moderate | High | Mid to Premium |
| AUS-10 | Stainless | 59 to 61 | Moderate to Good | Moderate | High | Mid |
| SG2 / R2 | Powdered | 63 to 65 | Very Good | Hard | High | Mid to Premium |
| ZDP-189 | Powdered | 64 to 67 | Excellent | Very Hard | High | Premium |
| SKD | Semi Stainless | 62 to 64 | Good | Moderate | Moderate | Mid |
How to Choose: Three Questions
If you’re staring at this table and feeling overwhelmed, answer three questions:
1. How do you feel about maintenance?
If drying your knife immediately after each use sounds like a hassle, skip carbon steel. Go stainless (VG-10, Ginsan) or powdered (SG2).
If you don’t mind the ritual and maybe even enjoy it, carbon steel rewards you with the best sharpening experience and some of the keenest edges available.
2. How often do you sharpen?
If the answer is “rarely” or “when it feels dull,” you want a steel with strong edge retention. SG2 or Aogami Super will hold an edge the longest. VG-10 sits in the middle.
If you sharpen weekly or enjoy maintaining your knives, Shirogami gives you the most pleasant experience on the stones, and it takes an edge faster than anything else on this list.
3. What’s your budget?
Budget focused: VG-10 (Tojiro DP) or VG-1 (Fujiwara FKM) give you excellent performance for the price.
Mid range: Aogami Super (Masakage Koishi, Munetoshi), Ginsan (Tanaka, Ashi Ginga), or SG2 (Takamura R2) open up high performance options.
Premium: SG2 (Yu Kurosaki), ZDP-189 (Sukenari), or Shirogami #2 from top blacksmiths (Mazaki) for collectors and serious enthusiasts.
Common Misconceptions
“Carbon steel is better than stainless.” It’s different, not better. Carbon takes a sharper edge and sharpens more easily. Modern stainless and powdered steels hold an edge longer and don’t rust. Neither is objectively superior. It depends on what you value.
“Higher HRC means a better knife.” Hardness is one variable. A 67 HRC knife that chips on a cutting board isn’t better than a 61 HRC knife that holds up reliably for months. Toughness, grind geometry, and heat treatment quality matter just as much as the number.
“Damascus steel is stronger/sharper.” Damascus is a cladding pattern, not a core steel. A Damascus knife has a core of one steel (often VG-10 or SG2) wrapped in layers of softer steel for aesthetics. The wavy pattern looks beautiful but has no meaningful effect on cutting performance. The core steel is what matters.
“You need diamond stones for powdered steel.” Regular whetstones work fine for SG2. ZDP-189 benefits from diamond plates for heavy reprofiling, but day to day touch ups work on synthetic stones. You don’t need special equipment for most powdered steels.
Where to Go From Here
Steel is the foundation, but it’s not the whole knife. How that steel is ground, how it’s heat treated, and what shape the blade takes all matter enormously. A mediocre heat treatment can waste great steel, and a skilled bladesmith can make a modest steel perform above its class.
If you’re still figuring out what type of knife you need, Japanese Knife Types Explained covers gyuto, santoku, nakiri, and everything else. And if you’re ready to buy your first Japanese knife, our beginner’s buying guide breaks down the decision step by step.
The steel just determines what happens after you bring it home.