Aogami (Blue Steel)

Aogami (青紙), known globally as Blue Steel, is the aristocracy among Japanese high-carbon steels. Its name does not refer to the color of the metal itself, but to the color of the paper in which the Hitachi Metals foundry traditionally wraps finished ingots to distinguish them from other grades.

In the world of Yasashi Ōkami, Aogami is synonymous with relentless sharpness and noble aging.

The Soul of Steel: Characteristics

Aogami is created by enriching pure white steel (Shirogami) with two key elements: chromium and tungsten. This subtle alchemy changes the nature of the metal:

• Tungsten: gives the steel incredible wear resistance. A knife made of Aogami retains its cutting aggression much longer than standard blades.
• Chromium: facilitates the hardening process and increases the strength of the steel, making it less prone to cracking, although it remains a reactive (carbon) steel.

Types of Blue

In Japanese blade forging, we distinguish three main grades of this steel:

• • Aogami #2: The most balanced. Offers phenomenal sharpness and relative ease of sharpening.
• • Aogami #1: Has a higher carbon and tungsten content. It is harder and retains its edge even longer.
• • Aogami Super: The absolute pinnacle of engineering. Thanks to the addition of vanadium, it is one of the hardest steels in the world.

Why Aogami?

Choosing a blue steel knife is a statement. Over time, Aogami develops a patina – a unique, dark coating that is a map of your culinary experiences. At Yasashi Ōkami, we believe that patina on Aogami steel is not a blemish, but proof that the knife lives with you.