The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 12, 2011
Filed:
Oct. 10, 2005
Pascal Drillet, Rozerieulles, FR;
Daniel Bouleau, Metz, FR;
Pascal Drillet, Rozerieulles, FR;
Daniel Bouleau, Metz, FR;
ARCELOR France, Saint Denis, FR;
Abstract
The invention relates to a process for manufacturing a corrosion-resistant cold-rolled sheet of iron-carbon-manganese austenitic steel, comprising the following steps: a sheet whose chemical composition comprises, the contents being expressed by weight: 0.35%≦C≦1.05%, 16%≦Mn≦24%, the balance of the composition consisting of iron and inevitable impurities resulting from its smelting, is provided; said sheet is cold-rolled; and a recrystallization annealing treatment is carried out on said sheet in a furnace containing a gas chosen from gases that are reducing with respect to iron, the parameters of said annealing being chosen in such a way that said sheet is covered on both its sides with an essentially amorphous (Fe,Mn)O oxide sublayer and with an external crystalline manganese oxide (MnO) layer, the total thickness of these two layers being equal to or greater than 0.5 microns.