| 摘要 |
PROBLEM TO BE SOLVED: To improve peeling resistance and erosion resistance by setting the surface roughness of a base steel to be not higher than a specified value, and setting the thickness of a CrN film to be in a specified range. SOLUTION: An as-cast pin 1 for a die-casting member is provided, for example, with a pin body 2 formed of an alloy tool steel. The pin body 2 is formed of a base steel, and a CrN film 3 is formed by the PVD method on its surface. The surface roughness of the pin body 2 is <=4.0μm Rmax in maximum height, and the thickness of the CrN film 3 is 1.0-7.0μm. The surface roughness of the pin body 2 is preferably 1.0-3.0μm Rmax in maximum height since the erosion is minimum and is stable. The surface precision of the pin body 2 is improved, and the CrN film 3 is excellent in adhesivity, and difficult to peel. The CrN film 3 preferably includes at least the CrN crystalline surface of the Miller Index (111).
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