The steel is the single most important decision when buying a Japanese knife. It determines how sharp the blade gets, how long it stays that way, and how much care it needs. Here's everything you need to know — in plain English.
| Steel | Type | Sharpness | Retention | Maintenance |
|---|---|---|---|---|
| Blue Steel #2 | Carbon Steel | ●●●●● | ●●●●○ | ●●●○○ |
| White Steel #1 | Carbon Steel | ●●●●● | ●●●○○ | ●●○○○ |
| Aogami Super | Carbon Steel | ●●●●● | ●●●●● | ●●●○○ |
| SG2 Powder Steel | Stainless (Powder) | ●●●●● | ●●●●● | ●●●●● |
| VG-10 | Stainless | ●●●●○ | ●●●●○ | ●●●●● |
● = higher is better for Sharpness and Retention. For Maintenance, ●●●●● = lowest maintenance required.
Blue Steel #2 (Aogami #2) is the most popular carbon steel among professional chefs in Japan for good reason. It combines a razor-sharp edge with enough toughness for daily use, and sharpens easily on a whetstone. The 'blue' refers to the blue paper the steel was historically wrapped in at the mill — a quality marker.
Home cooks willing to learn knife care. Professional kitchens. Anyone who wants the Japanese knife experience fully.
People who wash knives in dishwashers. Kitchens where knives sit wet.
White Steel #1 (Shirogami #1) is the purest carbon steel made. Almost no alloying elements — just iron and carbon. The result is an edge of extraordinary sharpness that almost no other steel can match. It's also the most demanding: White #1 sharpens beautifully but dulls faster than Blue Steel, and reacts quickly to moisture and acid.
Experienced knife users. Sashimi and precision cuts. Those who sharpen regularly and enjoy the ritual of knife care.
Beginners. Anyone who wants a 'use and ignore' knife.
Aogami Super is the premium version of Blue Steel — higher carbon content and added tungsten give it extraordinary edge retention. A knife in Aogami Super will stay sharp through significantly more use than regular Blue Steel before needing a touchup. The trade-off: it's harder to sharpen when it finally needs it.
Serious home cooks or professionals who sharpen their own knives. Anyone who wants long intervals between sharpenings.
Those who can't or don't want to sharpen their own knives.
SG2 (also called R2) is a premium powder metallurgy stainless steel — made by bonding ultra-fine steel particles under high pressure. The result is an extremely fine, consistent grain structure that allows hardness and edge retention normally only achievable with carbon steel, while remaining fully stainless. Used by professional chefs who need performance and low maintenance.
Professionals and serious cooks who want carbon-steel performance without the maintenance burden. Anyone in a busy kitchen.
Those who sharpen at home on basic whetstones without experience.
VG-10 is the workhorse stainless steel of Japanese knife making. It's not as hard as SG2 or as sharp as carbon steel, but it's tough, very rust resistant, and sharpens easily. The steel that powers more Japanese knives worldwide than any other. Often used as the core in Damascus-layered blades.
Anyone starting with Japanese knives. Gift buyers. Home cooks who want a quality knife they don't have to think about.
Those chasing maximum sharpness or edge retention.
For most home cooks, Blue Steel #2 or VG-10 is the right starting point. Browse our collection and each listing shows the steel clearly.
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