Petty Knife Minamoto Kogane Japanese Steel Black Composite Bolster 150mm　(ペティ 源光金 日本鋼 黒合板共口金 150mm)

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Cutlery description
Production area: Seki City, Gifu Prefecture (Seki Cutlery)
Category: Petty knife
Blade length: 150mm
Steel: SK material (Japanese steel)
Handle: Black plywood with ferrule
(The ferrule prevents dirt from accumulating at the boundary between the blade and the handle, which is prone to dirt accumulation, and allows for hygienic use)


SK material is a high-carbon steel that contains 0.55 to 1.5% carbon and does not contain any alloying elements such as chromium or molybdenum, and is a material that is frequently used in tools.
The name SK is an abbreviation that combines English and Japanese. S stands for steel and K stands for tool.
SK material, like S-C material (carbon steel for mechanical structures), is easier to obtain a harder heat treatment hardness as the carbon content increases up to about 0.6%, but above 0.6%, the increase in heat treatment hardness rapidly slows.
SK material is often required for impact resistance and abrasion resistance rather than hardenability, and steels with a low carbon content are chosen for applications where impacts will be performed, i.e. impact resistance that requires toughness, while steels with a high carbon content are chosen for abrasion resistance that requires sharpness, so these are the materials used for knives.
SK material has long been a popular material for knives, and is the standard steel used for household use.
As it is a material that rusts, it has a better sharpness than stainless steels such as molybdenum.