Fredrik Spåre

Aogami Super — Blue Super, in plain English — is the most heavily alloyed of Hitachi's blue-paper steels, and the one most associated with the long-edge-life end of the traditional Japanese kitchen knife world. Roughly 1.45 percent carbon, half a percent each of chromium and tungsten, plus molybdenum and vanadium additions, give it noticeably more carbide content than Aogami #2 or #1.

In a competent gyuto it typically lands at 63–65 HRC and holds an edge for an unusually long time for a non-powder steel. The trade-off, predictable from the chemistry, is that the larger carbides mean slightly more work at the stone and a slightly less smooth edge than Shirogami #1 at its peak. Most users do not notice; the ones who do tend to come from a finishing-stone tradition. Toughness is moderate — similar to or slightly below the white papers at the same hardness — and the steel will patina with normal use.

Aogami Super is the steel you reach for when you want a long-running edge from a maker who refuses to use powder metallurgy. It is widely used across the Sakai and Sanjō traditions and remains one of the most-asked-for Hitachi steels on the secondary market. Among the makers Modern Cooking carries, Neil Ayling, Konstantinos Noulis, and Jonas Johnsson work in Aogami Super. It is, in many ways, the canonical "blue paper" experience.

"Damascus" is a construction technique, not a steel. Modern damascus billets are made by forge-welding alternating layers of two or more steels — typically a higher- and a lower-carbon partner, or a contrasting-nickel pair — and then folding, twisting, ladder-cutting, or otherwise manipulating the billet to expose the layer interfaces in a pattern. The visual interest comes from the etch, which preferentially attacks one of the two steels.

For a kitchen knife the relevant question is always: what is the cutting steel? Many premium Japanese damascus knives are *clad* damascus — a VG-10, SG2 or carbon core inside a multi-layer damascus jacket — in which case the patterning is decorative and the cutting metallurgy is the core. In *full* damascus knives (more common in custom Western work) the entire blade is pattern-welded, and the cutting steel is the harder of the two laminate components.

This is one of the points where a customer-facing entry needs to be honest: a beautiful damascus pattern is a craft achievement, but it does not on its own tell the buyer how the knife will cut. The core steel does that, and a good maker will list both.