Die-casting die and method for die-casting

A die-casting die, comprising:

• a cavity forming surface, a part of the cavity forming surface being coated with a surface treatment layer including a mixture of fibrous carbon and particle carbon and having a thermal conductivity that increases in connection to an increase in an acted pressure.

The method for die-casting according to claim 5, further comprising:

• setting a thermal conductivity of an area of the cavity forming surface, for inhibiting the cooling of the molten material by the die-casting die so as to accelerate a flow of the molten material, to be equal to or less than 2 W/mK under a nonpressurized state by coating the area of the cavity forming surface with the surface treatment layer;
• and
• setting a thermal conductivity of an area of the cavity forming surface, for accelerating cooling of the molten material by the die-casting die, to be equal to or more than 30 W/mK by not coating the range of the cavity forming surface with the surface treatment layer.