Patent ID: 7967275

Claim:
A mold comprising a steel substrate; a hard film on the steel substrate; and a covering layer C between the steel substrate and the hard film, wherein the hard film comprises at least one covering layer A and at least one covering layer B stacked one over the other; each covering layer A and each covering layer B has a thickness in a range of from 5 to 100 nm; the covering layer C is thicker than 5 μm; each covering layer A has a composition represented by the formula M(B a C b N 1−a−b ) where M denotes one or more elements selected from the group consisting of W, V, Mo, and Nb, 0≦a≦0.3, and 0≦b≦0.5; each covering layer B has a composition represented by the formula Ti 1−x−y−z Cr x Al y Si z (C 1−A N A ) where 0≦1−x−y−z≦0.5, 0≦x≦0.5, 0.4≦y≦0.7, 0≦z≦0.15, and 0.5≦A≦1; and the covering layer C has a composition represented by the formula (Cr d M 1−d )(Cr 1−e N e ) where M denotes one or more elements selected from the group consisting of Ti, Al, Nb, W, Mo, and Si, 0.2≦d≦1, and 0≦e≦1.