Patent ID: 8043728

Claim:
A hard coating film for coating a forming die of an alloy comprising iron and a Cr-containing precipitated carbide, said hard coating film comprising: a first coating layer A of a thickness between 3 and 10 μm formed on the forming die of the alloy; and a second coating layer B of a thickness between 2 and 10 82 m overlying the coating layer A; wherein the first coating layer A is a film of Cr l-x M x (B a C b N l-a-b ) meeting conditions expressed by expressions: 0≦x≦0.7 (1A) 0≦a≦0.2 (2A) 0≦b≦0.5 (3A) wherein M is at least one element among W, V, Mo, Nb, Ti and Al, x is atomic ratio of M, a is atomic ratio of B and b is atomic ratio of C, and the second coating layer B is a film of Ti l-X-Y-Z Cr X Al Y Si Z N meeting conditions expressed by expressions: 0≦ l−X−Y−Z≦ 0.5 (1B) 0<X≦0.5 (2B) 0.4≦Y≦0.7 (3B) 0.01≦Z≦0.15 (4B) wherein X is atomic ratio of Cr, Y is atomic ratio of Al, and Z is atomic ratio of Si and wherein the forming die has a Rockwell hardness of HRC 50 or above.