PURPOSE: To develop excellent cutting capacity over a long period of time, by forming a softened layer to the scoop-up surface of the base of a surface coated throw-away chip to reduce high temp. plastic deformation as well as to secure toughness.

CONSTITUTION: A WC base pressed powder body is sintered to prepare a throw- away chip made of a WC base hard alloy having a softened layer with a thickness of 10W200μm throughout the total surface thereof. The surface part other than the scoop-up surface of this throw-away chip is removed by grinding and honing is applied to the ground part. In the next process, a hard layer comprising TiCN or the like is formed on the surface thereof by a chemical vapor deposition method or a physical vapor deposition method. Because this surface coated throw-away chip has the softening layer formed only to the scoop-up surface thereof, plastic deformation is hardly generated. Therefore, the recession or the initial abrasion of a blade chip are reduced and excellent cutting capacity is developed over a long period of time.