Title:
METHOD FOR MANUFACTURING COLD-ROLLED, WELDED STEEL SHEETS, AND SHEETS THUS PRODUCED
Document Type and Number:
WIPO Patent Application WO/2017/163115
Kind Code:
A8
Abstract:
The invention relates to a method for manufacturing a cold-rolled steel sheet with a thickness ef of 0.5 to 3 mm, comprising the consecutive steps of: providing at least two hot-rolled sheets with a thickness e,, and then welding said at least two hot-rolled sheets end-to-end, so as to create a welded joint (S1) in a direction perpendicular to the hot-rolling direction; then stripping by continuously passing said at least two hot-rolled sheets through a bath; then cold-rolling, in a step (L1), the assembly of the at least two hot-rolled and welded sheets, to an intermediate thickness eint, the cold-rolling direction (DL1) matching said hot-rolling direction, said cold-rolling being carried out with a reduction rate ε1=Ln(e
i
/e
int) so that: 0.35 ≤ Ln(ei/eint)/Ln(ei/ef) ≤ 0.65, and then removing said welded joint (S1) so as to obtain at least two sheets cold-rolled in an intermediate manner, and then welding end-to-end the two sheets cold-rolled in an intermediate manner, so as to create a welded joint (S2) with a direction perpendicular to the hot-rolling direction, and then cold-rolling, in a step (L2), the assembly of the at least two sheets cold-rolled in an intermediate manner and welded, down to the final thickness ef, the direction (DL2) of the cold-rolling step (L2) matching the rolling direction (DL1).
Inventors:
DECHASSEY EMMANUEL (ES)
SILVY LELIGOIS CHRISTOPHE (ES)
CHICHARRO HERRANZ FRANCISCO (ES)
POLO MESTRE VICENTE (ES)
THEYSSIER MARIE-CHRISTINE (FR)
CELOTTO THIERRY (FR)
KACZYNSKI CHRISTINE (FI)
DUPUY THOMAS (FR)
QUANG-TIEN NGO (FR)
SILVY LELIGOIS CHRISTOPHE (ES)
CHICHARRO HERRANZ FRANCISCO (ES)
POLO MESTRE VICENTE (ES)
THEYSSIER MARIE-CHRISTINE (FR)
CELOTTO THIERRY (FR)
KACZYNSKI CHRISTINE (FI)
DUPUY THOMAS (FR)
QUANG-TIEN NGO (FR)
Application Number:
PCT/IB2017/000176
Publication Date:
September 27, 2018
Filing Date:
February 27, 2017
Export Citation:
Assignee:
ARCELORMITTAL (LU)
International Classes:
C21D8/02; B21B15/00; C21D9/46; C21D9/50
Attorney, Agent or Firm:
PLAISANT, Sophie (FR)
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