Low-density steel having good drawability

摘要

The invention relates to a hot-rolled ferritic steel sheet, the composition of the steel of which comprises, the contents being expressed by weight: 0.001≦C≦0.15%, Mn≦1%, Si≦1.5%, 6%≦Al≦10%, 0.020%≦Ti≦0.5%, S≦0.050%, P≦0.1%, and, optionally, one or more elements chosen from: Cr≦1%, Mo≦1%, Ni≦1%, Nb≦0.1%, V≦0.2%, B≦0.010%, the balance of the composition consisting of iron and inevitable impurities resulting from the smelting, the average ferrite grain size dIV measured on a surface perpendicular to the transverse direction with respect to the rolling being less than 100 microns.

主权项

1. A hot-rolled ferritic steel sheet, the composition of the steel of which comprises, the contents being expressed by weight:
0.001≦C≦0.15% Mn≦1% Si≦1.5% 7.5%≦Al≦10% 0.020%≦Ti≦0.5% S≦0.050%, and P≦0.1%the balance of the composition consisting of iron and inevitable impurities resulting from the smelting, wherein said hot-rolled ferritic steel sheet, resulting from hot-rolling of said steel composition, comprises kappa (κ) precipitates and non-equiaxed ferrite grains wherein an average grain size div of the non-equiaxed ferrite grains, measured on a surface perpendicular to the transverse direction with respect to the hot-rolling is less than 100 microns and wherein the non-equiaxed ferrite grains have an elongation in a direction of the hot rolling.