LOW DENSITY HIGH STRENGTH STEEL AND METHOD FOR PRODUCING SAID STEEL

摘要

The present invention relates to a low density high strength steel sheet comprising 0.15% to 0.25% C 2.5% to 4% Mn 0.02% or less P 0. 015% or less S 6% to 9% Al and 0.01% or less N the balance being iron and inevitable impurities wherein 1.7•(Mn Al) + 52.7•C is at least 3 and at most 4.5 and to a method of producing said low density and high strength steel sheet.