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List of blade materials
Blade materials are those used to make the blade of a knife or other simple edged hand tool or weapon, such as a hatchet or sword.
The blade of a knife can be made from a variety of materials, the most common being carbon steel, stainless steel, tool steel and alloy steel. Other less common materials used in knife blades include: cobalt and titanium alloys, ceramics, obsidian, and plastic.
The hardness of steel is usually stated as a number on the Rockwell C scale (HRC). The Rockwell scale is a hardness scale based on the resistance to indentation of a material, as opposed to other scales such as the Mohs scale (scratch resistance) testing used in mineralogy. As hardness increases, the blade becomes capable of taking and holding a better edge, but is more difficult to sharpen and more brittle (commonly called less "tough"). Laminating a harder steel between a softer one is an expensive process that to some extent gives the benefits of both types (see Damascus steel).
==Steel==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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