Hardness

 Hardness is one of the most important indicators in the selection of knife materials. Since the sharpness of a knife is affected by the performance of the cutting edge, it cannot be said that a higher hardness of the material will result in a better sharpness. However, it is a point of the element that influences the sharpness of a knife.
However, there is a disadvantage in that the higher the hardness, the more the toughness is compromised and the more likely the knife is to spill. It is also more difficult to sharpen knives. The hardness of a knife is expressed by a numerical value called HRC, and the higher the value, the harder the knife.

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Japanese Knife Materials: 4 Key Characteristics Explained | KIREAJI