| 摘要 |
PROBLEM TO BE SOLVED: To provide a precoated steel sheet applicable to a diaphragm of an electric horn. SOLUTION: The precoated steel sheet for the diaphragm of the electric horn has a resin coating film layer which contains fluororesin particles of over 2 to 8μm in mean particle diameter D<SB>M</SB>at 1.5 to 8.0 mass% on the surface of a base steel sheet of 200 to 300 HV in hardness and is adjusted to a range of≥0.8 D<SB>M</SB>and 3 to 10μm in average film thickness. The stainless steel sheet in which the base steel sheet has a composition of, by mass%,≤0.1% C,≤2% Si,≤1% Mn,≤0.04% P,≤0.003% S,≤2.5% Ni, 15 to 18% Cr,≤0.05% N, and the balance Fe, and the matrix exhibits the diplophase structure of a ferrite phase + martensite phase. COPYRIGHT: (C)2008,JPO&INPIT |
