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Cutting tools must posses certain mechanical properties in order to function adequately during the cutting operations.These properties include high hardness and the ability to retain it even at the elevated-temperatures generated during cutting.They also include toughness,abrasion resistance,and the ability to withstand high bearing pressures.A cutting material is selected to suit the cutting conditions,such as the workpiece,material,cutting speed,production tare,coolants used,and so on.The following are the commonly used cutting tool materials.