Abstract: A steel sheet that is welded and then cold rolled to a thickness between 0.5 mm and 3 mm, the deformation ratio created by cold rolling in the base metal is equal to ?MB, for which the deformation ratio created by the cold rolling in the welded joint is equal to ?S, where: 0.4 ? ?S ? ? M ? B < 0.7 .

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 ? 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.

Abstract: A steel sheet that is welded and then cold rolled to a thickness between 0.5 mm and 3 mm, the deformation ratio created by cold rolling in the base metal is equal to ?MB, for which the deformation ratio created by the cold rolling in the welded joint is equal to ?S, where: 0.4 ? ?S ? ? M ? B < 0.7 .

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 ? 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.

Abstract: A method of controlling a continuous skin-pass and reduction operation for a metal strip includes the steps of passing a strip through a gap between working rollers of at least two successive rolling stands, only an upstream one of the stands providing substantial thickness reduction of the strip; determining an extension rate of the strip provided by the upstream stand; determining a tension of the strip downstream of the upstream stand; adjusting the speed of the working rollers of the upstream stand compared to the speed of the working rollers of a downstream one of said stands according to the determination of the extension rate; and adjusting the squeezing force of the upstream stand according to the downstream tension determination. A response time to the step of adjustment of the squeezing force is longer than a response time to the step of adjusting the speed of the working rollers.

Abstract: A process for the cold rolling of a metal strip between rollers of rolling stands arranged sequentially is provided, along with a plant for its implementation, wherein the process involves:analyzing, as a function of frequency, a signal from an inter-stand tension measurement sensor corresponding to a level of tension of the metal strip to determine periodic variations in the signal having frequencies corresponding to a speed of rotation of the pair of rollers in a downstream rolling stand and proportional to out-of-roundness defects present in the rollers of the downstream rolling stand; andcompensating for the out-of-roundness defects in the rollers in the downstream rolling stand by adjusting the clamping setting of the rollers in the downstream rolling stand in accordance with a compensation signal, produced by the means for compensating, that is proportional to the periodic variations.