| 摘要 |
PROBLEM TO BE SOLVED: To provide a bore pin for casting a cylinder block with which the formation positional accuracy of the cylinder bore can be held under excellent state and the durable service life is longer in comparison with the conventional material by improving the wear resistance on the surface of the bore pin. SOLUTION: This bore pin is used for inserting into a liner when the cylinder block is cast, and formed with a coating layer composed of a high-speed steel base alloy at the portion in contact with at least the liner in a base material composed of a metal material. The above coating layer is composed of an Fe-base alloy containing by mass of 1.0-3.0% C, 0.1-2.0% Si, 0.1-2.0% Mn, 0-4.5% Ni, 3.0-10.0% Cr, 0-9.0% Mo, 0-10.0% W and 1.0-10.0% V. COPYRIGHT: (C)2007,JPO&INPIT
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