| 摘要 |
PROBLEM TO BE SOLVED: To provide a composite magnetic member which has low temperature magnetic stability more excellent than that of the conventional member in composite magnetic members combining a ferromagnetic part and a weak magnetic part in single material, and its production method. SOLUTION: The composite magnetic member having low temperature magnetic stability has a composition containing, by mass, 0.30 to 0.80% C, 0.10 to 3.0% Si, 0.10 to 4.0% Mn, 10.0 to 25.0% Cr, 0.01 to 3.0% Al and 0.01 to 0.10% N, and containing, as selective elements, one or more kinds selected from Nb, Ti and Zr by 0.10 to 1.0% individually or in total, and the balance substantially Fe, and contains a ferromagnetic part having a structure essentially consisting of (ferrite+carbide), and in which the specific maximum permeabilityμr is >=400, and a feeble-magnetic part having a structure essentially consisting of austenite, and in which the specific maximum permeabilityμr is <=2, the average crystal grain size is <=100μm, and the rate of the change of the specific maximum permeability in the temperature range from room temperature to -40 deg.C, (μr-40 deg.C-μrRT) /μrRT is <=1.
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