Interesting source of steel from the website:
The carbon steel used in our blades is from recycled leaf springs from heavy trucks & Russian war trucks that served in the Vietnamese war. The steel is 5160. This spring steel is a tough form of steel with a higher Carbon makeup. The higher Carbon reduces toughness, but increases wear resistance and attainable hardness. The steel is heat treated, giving the knives an HRC of around 60. HRC stands for Rockwell hardness. This rating refers to the level of hardness the steel has. Japanese knives are standardly between 60 to 63 HRC. They can be re-sharpened and hold an excellent edge because of the makeup of the steel.
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