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What is White #1, Shirogami 1 or White Paper Steel 1?

White #1, Shirogami 1, White Paper Steel 1 or White Paper Steel 1 are names for one of the most traditional knife steels of Japanese kitchen knives. Various steels are used for forging Japanese chef's knives, white paper steel is very commonly used for the blades of santoku knives and other types of Japanese knives.

What are the components of white paper steel?

White #1 knife steel (jap. 白紙 shirogami 1) is a pure carbon steel with no other metals added as alloying components. This steel has high sharpening potential and good edge retention.

Where does the name white paper steel 1 come from?

Hitachi, the manufacturer of this knife steel, uses a white paper to package the material, hence the name. Among knife connoisseurs, the name Shirogami 1 and White #1 is also widely used.

White #1 and White #2, which knife steel is better?

Both steels belong to the category of white paper steels. The difference lies in the carbon content. Shirogami 1 (White #1) has a carbon content of 1.25 - 1.35% whereas Shirogami 2 (White #2) has a carbon content of 1.05 - 1.15%. The carbon content is decisive for the hardness of a steel, but the final hardness of the blade steel is ultimately also determined by the hardening process used during forging.

What is the difference between Aogami 1 and Shirogami 1?

The difference between White #1 (Shirogami 1) and Blue #1 (Aogami 1) lies in the composition. Aogami 1 contains additional chromium and tungsten and can be tougher and more robust than Shirogami 1 knife steel depending on the processing technique. White #1 knife steel is usually cheaper than Blue #1 knife steel.