Patent ID: 6401323
Filing Date: 2002-06-11
Classification: B21B,B21C,Y10T

Abstract:
A process for producing welded pipes from Cu or Cu alloys in a combined production line, comprising a casting installation for raw materials, a hot-rolling mill, a pipe-shaping and welding section and a drawing device for the welded pipe, the process comprising a sequence of the following steps:a. casting an initial strip with dimensions in a range of width 45 to 200 mm, and thickness 10 to 70 mm, on a casting machine with a casting speed of up to 22 m/min; b. hot-rolling the cast initial strip to form an intermediate strip with dimensions in a range of width 45 to 200 mm and thickness 2.0 to 14 mm; c. cooling the intermediate strip to &lE;100Â° C. to ambient temperature and descaling of a surface of the intermediate strip; d. cold-rolling the intermediate strip to form a strip with dimensions in a range of width 45 to 200 mm, and thickness 0.9 to 6.3 mm, e. coiling the strip to form coils of predetermined weights, the steps a to e being carried out as an in-line process followed by the following further operating steps; f. unwinding and shaping the strip to form a longitudinal seam pipe; g. welding the longitudinal seam immediately after trimming of edges, to form a welded longitudinal seam pipe; h. if necessary, externally and internally deburring the pipe; i. finishing to size; and j. drawing the welded pipe in at least one drawing stage to form a finished pipe, if the welded pipe does not already constitute the finished pipe.