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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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