Mechanical fuse and production method for the same

摘要

A mechanical fuse has further improved and stabilized fatigue limit ratio, and can obtain high reliability under a using condition in which cyclic loading is applied. The mechanical fuse comprises Fe-based sintered alloy comprising at least one element of P at 0.15 to 1.5 mass %, Si at 0.4 to 2.0 mass %, and Mn at 1.0 to 4.0 mass %, and the remainder consisting of Fe and inevitable impurities, wherein an iron oxide layer is formed on a pore inner wall, and the pores have roundness of 0.004 or more. A method of production therefore is also provided.