COLD ROLLED STEEL SHEET FOR SHIELDING ELECTROMAGNETIC WAVE AND METHOD FOR MANUFACTURING IT

摘要

PURPOSE: A cold rolled steel sheet for shielding electromagnetic wave with yield strength over 25 kg/mm¬2 is provided, which has max permeability by time varying magnetic wave of higher than 2000 at 60 Hz. CONSTITUTION: The method for manufacturing a cold rolled steel sheet for shielding electromagnetic wave includes the steps of cold rolling a hot rolled steel sheet comprising 95 wt.% or more of Fe and 0.03 to 0.06 wt.% of carbon at a reduction ratio of less than 45 %; and electrogalvanizing, galvanizing or chromating the cold rolled steel sheet, followed by resin coating thereon.