The high manganese type where the high manganese type high intensity steel sheet null which

摘要

Topic Stretching ratio being high, it is superior in processability, the high processability high intensity steel sheet and the production method yield strength being high and being superior in collision quality are offered.SolutionsThe high manganese steel sheet, weight % with, carbon 0.2 - 1.5%, manganese 10 - 25%, aluminum 0.01 - 3.0% and phosphorus 0.03% or less, sulfur 0.03% or less and includes nitrogen 0.040%, or less in this silicon 0.02 - 2.5%, at least 1 where it is selected from titanium 0.01 - 0.10%, and the niobium 0.01 - 0.10% group kinds, remaining Fe and in addition is constituted with the impurity which is contained inevitably. As for this steel sheet, it is possible to be the hot rolling steel sheet, the cold rolling steel sheet or the plated steel sheet, stretching ratio is high, strain hardening exponent being high, being superior in press processability, not only the structural element of the body, as the inside plate material whose form is complicated conforms. In addition, because in quality of the steel sheet, it is superior in shocking absorbency, it can use for the part of the front side member et. al of the automobile.