HIGH STRENGTH LIGHTWEIGHT CLAD STEEL SHEET HAVING EXCELLENT STIFFNESS DENT RESISTANCE AND CORROSION RESISTANCE PROPERTIES

摘要

The present invention relates to a high strength and lightweight clad steel sheet excellent in rigidity, dent resistance and corrosion resistance, and a method of manufacturing the same. In one embodiment of the present invention, the steel sheet comprises 0.01 to 1.0% of C, 8 to 30% 0.01 to 3.0% of Al, 0.01 to 3.0% of Si, 0.1% or less of P, 0.02% or less of S and 0.1% or less of N, the balance being Fe and unavoidable impurities; And the aluminum-based plate material has a thickness of 0.1 to 1.5 mm, the total thickness is 0.6 to 2.5 mm, and the aluminum- A high strength and lightweight clad steel sheet having rigidity of 40 GPa mm mm ³ or more and excellent in rigidity, dent resistance, and corrosion resistance, and a method for producing the same. The lightweight clad steel sheet of the present invention is not only light but also has excellent rigidity, strength and ductility so that the product weight can be remarkably reduced as compared with the conventional clad material, so that the lightweight clad steel sheet can be preferably applied to automobile parts, , Hoods, trunk lid, etc., can be drastically improved.