Patent ID: 7794552
Filing Date: 2010-09-14
Classification: C21D,C22C

Abstract:
1. A hot-rolled austenitic iron/carbon/manganese steel sheet, wherein a strength of the steel sheet is greater than 1200 MPa; a product P of a strength in MPa×an elongation at break in % of the steel sheet is greater than 65000 MPa %; a nominal chemical composition of the steel sheet comprises iron and inevitable impurities and, by weight: and, optionally, one or more elements selected from the group consisting of: a recrystallized surface fraction of said steel is equal to 100%; a surface fraction of precipitated carbides of said steel sheet is equal to 0%; a mean grain size of the steel sheet is less than or equal to 10 microns; and, at any point in said steel sheet, a local carbon content C