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:
Nov. 20, 2018
Filed:
Feb. 13, 2014
Thyssenkrupp Steel Europe Ag, Duisburg, DE;
Dorothée Dorner, Dusseldorf, DE;
Christian Höckling, Duisburg, DE;
Harald Hofmann, Dortmund, DE;
Magnus Miller, Duisburg, DE;
Matthias Schirmer, Dusseldorf, DE;
Jonas Schwabe, Duisburg, DE;
Alexander Zimmermann, Aachen, DE;
Thyssenkrupp Steel Europe AG, Duisburg, DE;
Abstract
A cold-rolled flat steel product for deep drawing applications is disclosed, composed of a steel which, in addition to Fe and unavoidable impurities (in % by weight) contains C: <0.1%, Al: 6.5-11%, REM: 0.02-0.2%, P: <0.1%, S: <0.03%, N: <0.1% and optionally one or more elements from the group of 'Mn, Si, Nb, Ti, Mo, Cr, Zr, V, W, Co, Ni, B, Cu, Ca, N', provided that Mn: <6%, Si: <1%, Nb: <0.3%, Ti: <0.3%, Zr: <1%, V: <1%, V: <1%, Mo: <1%, Cr: <3%, Co: <1%, Ni: <2%, B: <0.1%, Cu: <3%, Ca: <0.015%. For production of such a flat steel product, a steel of appropriate composition is cast to give a pre-product, which is then hot-rolled to hot strip at a hot rolling end temperature of 820-1000° C. The latter is subsequently wound at a winding temperature of up to 850° C., after winding annealed at an annealing temperature of >650-1200° C. for 1-50 h, then cold-rolled in one or more stages with a total cold rolling level of ≥30% to give the cold-rolled flat steel product and finally annealed at 650-850° C.