Steel foil having excellent shielding characteristics to electromagnetic waves

摘要

An ultrathin steel foil which is suited for use as an electromagnetic wave shielding material and which is excellent in shielding properties, is provided by cold rolling to be 31% to 90% reduction and anneal at 600 DEG to 950 DEG C. for 1 hour of a steel material having specific chemical composition including C of less than 0.01% and specified grain diameter of between 20 to 80 mu m, and thicknesses of between 20 to 100 mu m.