A method of making a hot or cold strip and / or a flexible-rolled flat steel product from high strength manganese steel and a flat steel product made by this method

摘要

The invention relates to a method for producing a flexibly rolled flat steel product made of a high-strength manganese steel and having final thicknesses that vary as required from section to section. In order to achieve a high maximum degree of deformation, the following method steps are proposed: providing a galvanized or non-galvanized hot or cold strip with an alloy composition containing (in wt%): C: 0.0005 to 0.9; Mn: 4 to 12; Al: up to 10; P: 0.1; S: 0.1; N: 0.1; the remainder being iron, including unavoidable steel-alloying elements, with optional addition of one or more of the following elements (in wt%): Si: up to 6; Cr: up to 6; Nb: up to 1; V: up to 1.5; Ti: up to 1.5; Mo: up to 3; Sn: up to 0.5; Cu: up to 3; W: up to 5; Co: up to 8; Zr: up to 0.5; Ta: up to 0.5; Te: up to 0.5: B: up to 0.15; - flexibly rolling the hot or cold strip in one rolling step or in multiple rolling steps to the final thicknesses that vary as required from section to section, with the hot or cold strip at a temperature of 60°C to below Ac3, preferably from 60°C to 450°C, prior to the first rolling step. The invention also relates to a method for producing a hot or cold strip made of a high-strength manganese steel and to a flat steel product which is flexibly rolled according to said method.