| 摘要 |
The present invention is directed to provide a method for manufacturing a die for press forming of glass in which cracks are not easily caused in a surface covering layer. A surface covering layer made of an amorphous Ni-P alloy is formed on the surface of a base material made of a steel having a martensitic structure or made of steel in which µ-carbide is dispersed in low carbon martensite matrix. Then, the base material and the surface covering layer are heated to change the base material into a troostitic structure or a sorbitic structure and change the surface covering layer into a eutectic structure of Ni and Ni 3 P. Preferably, the base material contains 0.3 wt% or more and 2.7 wt% or less of carbon and 13 wt% or less of chromium, and the heat treatment is carried out at 270°C or more. |
