Invention Grant
- Patent Title: Method for manufacturing cold-rolled, welded steel sheets, and sheets thus produced
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Application No.: US16088287Application Date: 2017-02-27
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Publication No.: US11220723B2Publication Date: 2022-01-11
- Inventor: Emmanuel Dechassey , Christophe Silvy-Leligois , Francisco Chicharro Herranz , Vicente Polo Mestre , Marie-Christine Theyssier , Thierry Celotto , Christine Kaczynski , Thomas Dupuy , Quang-Tien Ngo
- Applicant: ArcelorMittal
- Applicant Address: LU Luxembourg
- Assignee: ArcelorMittal
- Current Assignee: ArcelorMittal
- Current Assignee Address: LU Luxembourg
- Agency: Davidson, Davidson & Kappel, LLC
- International Application: PCT/IB2017/000176 WO 20170227
- International Announcement: WO2017/163115 WO 20170928
- Main IPC: C21D9/46
- IPC: C21D9/46 ; C21D8/02 ; C21D9/50 ; B23K11/00 ; B23K11/04 ; B23K26/20 ; B21B15/00 ; C23G1/00 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/08 ; C22C38/12 ; C22C38/14 ; C22C38/16 ; C22C38/18 ; B23K103/04

Abstract:
A method for the manufacture of a cold-rolled steel sheet of thickness ef between 0.5 mm and 3 mm is provided. At least two hot-rolled sheets of thickness ei are supplied and butt welded, so as to create a welded joint (S1) with a direction perpendicular to the direction of hot rolling. The at least two hot-rolled sheets are pickled by continuous passage through a bath, then the assembly is cold rolled, in a step (L1), to an intermediate thickness eint, the direction of cold rolling (DL1) coinciding with the direction of hot rolling. The cold rolling is carried out with a reduction ratio ɛ 1 = Ln ( e i e int ) such that: 0 . 3 5 ≤ Ln ( ei e int ) Ln ( e i e f ) ≤ 0 . 6 5 , then the welded joint (S1) is removed so as to obtain at least two intermediate cold-rolled sheets. Then the two intermediate cold-rolled sheets are butt welded, so as to create a welded joint (S2), the direction of which is perpendicular to the direction of hot rolling, then the assembly of the at least two intermediate cold-rolled and welded sheets is cold-rolled, in a step (L2), to the final thickness ef, the direction (DL2) of the cold rolling step (L2) coinciding with the direction of rolling (DL1).
Public/Granted literature
- US20200299796A1 METHOD FOR MANUFACTURING COLD-ROLLED, WELDED STEEL SHEETS, AND SHEETS THUS PRODUCED Public/Granted day:2020-09-24
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