Low-density steel having good drawability

US9580766B2 · kind B2 · utility

Assignee

• Arcelormittal France · FR

Inventors

• Astrid Perlade · Le Ban-Saint-Martin, FR
• Xavier Garat · Homécourt, FR
• Jean-Louis Uriarte · Metz, FR
• Olivier Bouaziz · Metz, FR
• Josee Drillet · Rozérieulles, FR

Key dates

• Filing date: Apr 29, 2008
• Grant date: Feb 28, 2017
• Expiry date: Apr 29, 2028

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D2211/005
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

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.