A combined continuous casting and rolling system, a control device for such system, and a method for producing rolling stock, e.g., metal strip, using such system are disclosed. The combined continuous casting and rolling system may include a casting device for casting metal and a roll train having at least one roll stand for hot forming the rolling stock, wherein the system is operated such that the rolling stock extends continuously between the casting device and the roll train, wherein rolling stock is continually supplied to the roll train, and wherein a predetermined target thickness progression for the rolling stock is predetermined. Because the thickness progression has at least two different target thicknesses for different sections in the longitudinal direction of the rolling stock and the thickness progression is designed such that particular target thicknesses are set at least twice, longitudinally profiled rolling stock may be produced relatively inexpensively.

A combined continuous casting and rolling system, a control device for such system, and a method for producing rolling stock, e.g., metal strip, using such system are disclosed. The combined continuous casting and rolling system may include a casting device for casting metal and a roll train having at least one roll stand for hot forming the rolling stock, wherein the system is operated such that the rolling stock extends continuously between the casting device and the roll train, wherein rolling stock is continually supplied to the roll train, and wherein a predetermined target thickness progression for the rolling stock is predetermined. Because the thickness progression has at least two different target thicknesses for different sections in the longitudinal direction of the rolling stock and the thickness progression is designed such that particular target thicknesses are set at least twice, longitudinally profiled rolling stock may be produced relatively inexpensively.

Provided is a metal strip for a pipe with which the weight of a pipe can be reduced while maintaining the strength of a joint portion that tends to be structurally the weakest. A metal strip L is formed by rolling. The thickness of each of a head end portion 1a and a tail end portion 1b, which are longitudinal end portions 1, is greater than the thickness of an intermediate portion excluding the longitudinal end portions 1. The metal strips are connected to each other in series by welding, and a pipe is made by performing a pipe-forming operation.

Provided is a metal strip for a pipe with which the weight of a pipe can be reduced while maintaining the strength of a joint portion that tends to be structurally the weakest. A metal strip L is formed by rolling. The thickness of each of a head end portion 1a and a tail end portion 1b, which are longitudinal end portions 1, is greater than the thickness of an intermediate portion excluding the longitudinal end portions 1. The metal strips are connected to each other in series by welding, and a pipe is made by performing a pipe-forming operation.

Provided is a cold rolling method by which the occurrence of wrinkles during cold rolling can be prevented without having to modify a mill. A cold rolling method of rolling a steel sheet in multiple rolling passes using a cold mill, the method including when the steel sheet unit tension N.sub.1 during steady-state rolling exceeds the reference unit tension N.sub.0 in a specific rolling pass in which the target sheet thickness t.sub.0 on an exit side of the rolling pass is less than or equal to a reference sheet thickness, controlling the steel sheet unit tension N.sub.2 in an initial stage of rolling on an entry side of the specific rolling pass to be less than the reference unit tension N.sub.0 and less than the steel sheet unit tension N.sub.1 during the steady-state rolling, the reference unit tension N.sub.0 is calculated by the formula (1): N.sub.0=(150/9)t.sub.0+27.1.

Provided is a cold rolling method by which the occurrence of wrinkles during cold rolling can be prevented without having to modify a mill. A cold rolling method of rolling a steel sheet in multiple rolling passes using a cold mill, the method including when the steel sheet unit tension N.sub.1 during steady-state rolling exceeds the reference unit tension N.sub.0 in a specific rolling pass in which the target sheet thickness t.sub.0 on an exit side of the rolling pass is less than or equal to a reference sheet thickness, controlling the steel sheet unit tension N.sub.2 in an initial stage of rolling on an entry side of the specific rolling pass to be less than the reference unit tension N.sub.0 and less than the steel sheet unit tension N.sub.1 during the steady-state rolling, the reference unit tension N.sub.0 is calculated by the formula (1): N.sub.0=(150/9)t.sub.0+27.1.