METHOD FOR MANUFACTURING HIGH-STRENGTH COLD-ROLLED/HOT-ROLLED DP STEEL HAVING A TENSILE STRENGTH GRADE OF 590 MPA AND EXCELLENT WORKABILITY, AS WELL AS LITTLE DEVIATION IN THE MATERIAL PROPERTIES THEREOF

摘要

An object of the present invention is to provide a method for manufacturing high-strength cold-rolled/hot-rolled DP steel having a tensile strength grade of 590 MPa and excellent workability, as well as little deviation in the material properties thereof, wherein said excellent workability can be achieved using thin-slab continuous casting, and deviations in the material properties in the widthwise and lengthwise directions of a strip can be significantly reduced.