Patent ID: 6939623

Claim:
A high-strength steel plate with shield effect against time-varying electromagnetic field at low frequency and hot-dip galvanization property, prepared from a composition consisting essentially of C, N and S in an amount of 0.0150% by weight or less in total; Mn in an amount of 0.2 to 0.8% by weight; Al in an amount of 0.6% by weight or less; Si in an amount of 0.4% by weight or less; Cu and/or Sn in an amount of 0.1 to 0.6% by weight in total; Mn, Cu, Sn, Si and Al in a total amount of 1.0% by weight or less; the remainder of Fe and inevitably present elements; and said steel plate comprising a galvanized coating containing an anti-corrosive element thereon, said galvanized coating overlaid by a layer of far infrared radiation emitting powder which has a radiation efficiency of 0.9 with a thickness of 15-60 μm.