Aogami — Blue Steel, the Enthusiast Carbon Workhorse
Hitachi’s tungsten-and-chromium-doped carbon steel family. Like Shirogami but with longer edge retention and slightly more forgiving care.
Aogami is Shirogami with edge-retention enhancements. Cleaner sharpening than stainless, longer-lasting edge than pure white.
Aogami (青紙, “blue paper”) is Hitachi Metals’ enhanced carbon-steel family — named for the blue paper wrapped around its billets, to distinguish it from Shirogami (white paper). Adds tungsten and chromium to pure high-carbon steel for better edge retention and slightly improved corrosion resistance (still not stainless). Three grades: Aogami #1, Aogami #2, and Aogami Super. The preferred carbon-steel family for cooks who want the sharpening feel of white steel with longer working edges.
Aogami grades compared
| Grade | Carbon (%) | Tungsten (%) | Chromium (%) | HRC |
|---|---|---|---|---|
| Aogami #2 (Blue #2) | 1.05–1.15 | 1.0–1.5 | 0.2–0.5 | 62–64 |
| Aogami #1 (Blue #1) | 1.25–1.35 | 1.5–2.0 | 0.2–0.5 | 63–65 |
| Aogami Super (Blue Super) | 1.40–1.50 | 2.0–2.5 | 0.3–0.5 | 64–66 |
Tungsten forms very hard tungsten carbides — significantly harder than iron carbides. These carbides are the source of Aogami’s signature improvement: longer edge retention than Shirogami at comparable hardness. Chromium adds minor corrosion resistance (Aogami still rusts, but less aggressively than Shirogami under the same conditions).
Aogami Super is the most modern grade — developed later than #1 and #2 — and pushes the hardness ceiling further. It’s the preferred carbon steel of high-end enthusiast makers like Moritaka.
When to pick Blue over White
| Shirogami | Aogami | |
|---|---|---|
| Edge retention | Shorter | Longer (tungsten carbides) |
| Sharpening feel | Cleanest possible — pure iron matrix | Slightly slower (tungsten resists grinding) |
| Corrosion resistance | Worst case | Slightly better (still rusts, just less aggressively) |
| Cost | Cheaper billet steel | More expensive billet |
| Traditional association | Sakai smiths; honyaki; purists | Modern enthusiast smiths; Moritaka; production knives |
The cleanest summary: Shirogami is what the Sakai master smiths trust; Aogami is what the modern enthusiast-tier makers have optimized around. Both are superb; you’re choosing between sharpening-feel purity (Shirogami) and working-edge longevity (Aogami).
Aogami care vs Shirogami care
Aogami’s minor chromium addition gives it marginally better corrosion resistance, but don’t let that fool you. It’s still carbon steel. Every rule from our Shirogami care guide applies:
- Hand-wash immediately.
- Dry completely.
- Oil periodically (camellia, mineral).
- Patina is good; red rust is not.
- Never dishwasher.
The one practical difference: Aogami tolerates a couple-minute delay before drying where Shirogami would start to spot. This is NOT a license to leave Aogami wet; it’s a small margin of safety when you’re actively using the knife and wiping occasionally.
When Aogami is the right steel
Buy Aogami if:
- You want the sharpening feel of carbon steel with better edge retention than Shirogami.
- You’re buying from one of the cult-favorite modern smiths (Moritaka, Takeda, Teruyasu Fujiwara, Hinoura) whose signature output is Aogami.
- You want a single high-end carbon-steel knife and don’t need the ultra-purist sharpening feel of Shirogami.
- You cook aggressive high-volume and want the tungsten-carbide edge-retention boost.
Buy Shirogami instead if:
- You’re pursuing the absolute cleanest sharpening feel possible.
- You’re buying a Sakai-tradition single-bevel (yanagiba, deba) where Shirogami is the canonical choice.
- You don’t cook in high enough volume to notice the edge-retention difference.
Best Aogami knives by tier
Moritaka Aogami Super 210mm Gyuto
The single most-referenced Aogami Super gyuto in enthusiast circles. Hand-forged in Kochi. See our Moritaka guide.
Check on Amazon →Takada no Hamono Aogami #2 210mm Gyuto
Hand-forged Sanjo boutique gyuto. Thinner behind the edge than production Aogami. See our Tsubame-Sanjo guide.
Check on Amazon →Moritaka Aogami Super 165mm Nakiri
The enthusiast vegetable knife. Same Aogami Super magic in nakiri profile.
Check on Amazon →Teruyasu Fujiwara Aogami Super Denka Honyaki
A “Denka” (heavenly blade) from one of Japan’s most respected small smithies. Collector-grade. Years-long wait lists.
Check on Amazon →Related terms
Aogami and Shirogami are the two endpoints of serious carbon-steel Japanese cooking.
Neither is better. Pick Aogami for working-edge longevity; pick Shirogami for the cleanest sharpening feel. Both demand the same care discipline.
Read about Shirogami (White Steel) →