FLAT STEEL PRODUCT AND METHOD FOR THE PRODUCTION THEREOF

The invention relates to a bake hardening treatment of a suitable very high-strength flat steel product and to a method for producing such a flat steel product. The flat steel product consists of a steel that consists of (in wt%) 0.1-0.5% C, 1.0-3.0% Mn, 0.5-2.0% Si, 0.01-1.5% Al, 0.001-0.008% N, up to 0.02% P, up to 0.005% S and optionally one or more of the following elements: 0.01-1.0% Cr, 0.01-0.2% Mo, 0.001-0.01% B, and optionally a total of 0.005-0.2% V, Ti and Nb, the Ti proportion not being more than 0.10%, and, as the remainder, iron and unavoidable impurities. The flat steel producthas a microstructure that consists of not more than 15 area % ferrite, not more than 5 area % bainite, at least 5 volume % residual austenite and at least 80 area % martensite, of which at least 75 area % is tempered martensite. 适合烘烤硬化处理的极高强度扁钢产品及其制造方法。扁钢产品由钢构成，钢由(重量％计)0.1-0.5％C，1.0-3.0％Mn，0.5-2.0％Si，0.01-1.5％Al，0.001-0.008％N，至高0.02％P，至高0.005％S及任选以下元素一种或多种，Cr：0.01-1.0％、Mo：0.01-0.2％、B：0.001-0.01％，及任选总计0.005-0.2％V、Ti和Nb，Ti份