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Abstract

A cold-rolled and annealed steel sheet is provided, the chemical composition of which comprises, the contents being expressed by weight percent:

0.10≦C≦0.13%2.4≦Mn≦2.8%0.30≦Si≦0.55%0.30≦Cr≦0.56%0.020≦Ti≦0.050%0.0020≦B≦0.0040%0.005≦Al≦0.050%Mo≦0.010%Nb≦0.040%0.002≦N≦0.008%S≦0.005%P≦0.020%,the remainder consisting of iron and unavoidable impurities resulting from the smelting, the steel sheet having a microstructure consisting of, in surface proportion, martensite and/or lower bainite, said martensite comprising fresh martensite and/or self-tempered martensite, the sum of the surface proportions of martensite and lower bainite being comprised between 60 to 95%, 4 to 35% of low carbide containing bainite, 0 to 5% of ferrite, and less than 5% of retained austenite in island form.

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