| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel sheet for internal magnetic shielding having excellent geomagnetic shielding property and to provide its manufacturing method. SOLUTION: The steel sheet for internal magnetic shielding has≥2.0 ratio of the non-hysteresis magnetic permeability in the rolling direction and to that in the direction orthogonal to the rolling direction,≥20,000 non-hysteresis magnetic permeability in the rolling direction, and≤3.20 Oe coercive force. The steel sheet for internal magnetic shielding is manufactured by hot rolling and cold rolling a steel containing by mass%, >0.005% and≤0.1% C, <0.3% Si,≤1.5% Mn,≤0.05% P,≤0.04% S,≤0.1% sol. Al, and≤0.005% O, then continuously annealing in the temperature range from 600°C to 780°C, adding specified tension in a cooling zone, and subjecting the steel to no temper rolling or to temper rolling with≤0.2% elongation rate. COPYRIGHT: (C)2005,JPO&NCIPI
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