| abstract |
(57) [Abstract] [Objective] The present invention provides titanium nitride, The purpose of the present invention is to supply a flat blade for shearing a steel sheet having a blade surface width length of 1 m or more, which is coated with carbide or carbonitride and has excellent adhesion. [Structure] A flat blade for shearing a steel plate having a length of 1 m or more, in which hard ceramics is coated on the surface of a tool steel by an ion plating method. The coating composition of this ceramic is a titanium nitride layer on the surface of the tool steel, a metal titanium layer is further coated on it, and a titanium nitride, carbide, or carbonitride ceramic is coated directly on this metal layer, The outermost surface layer is a flat blade for shearing steel plates having a length of 1 m or more and containing ceramics. [Effect] Compared with conventional flat blades for shearing steel plates, flat blades with a longer life can be supplied. |