Patent ID: 9732404
Date: 2017-08-15
CPC Classifications: C22C

Claim:
1. A steel having a steel composition, comprising, the contents being expressed by weight: 0.08%≦C≦0.23% 1%≦Mn≦2% 1≦Si≦2% Al≦0.030% 0.12%≦V≦0.25% Ti≦0.010% S≦0.015% P≦0.1%, and 0.008%≦N≦0.012%, the balance of the composition including iron and inevitable impurities resulting from the smelting, wherein said steel composition exhibits TRIP behavior and a microstructure of said steel includes ferrite with a precipitation of vanadium carbonitrides and a residual austenite content of between 8 and 20%, the mean size of the residual austenite islands being 2 microns or less.