New material development and manufacture of crimpinq dies in UOE welded pipe plant

摘要

Crimping is one of the major processes of a LSAW (longitudi?nally submerged arc welding) steel pipe production line, which results in the bending deformation of both plate sides; after crimping, both sides become the arc of the curvature radius close to the finished pipe radius in order to ensure geometrical dimensional accuracy of the pipe welding seam area. There has been no crimping process in the early LSAW pipe production line, such as the world's first industrial production line of UOE welded pipe in McKeesport, USA, in 1951. The second generation of UOE welded pipe mills were built from 1955 to 1967, and a portion of a total of 18 sets of new mills and one set of reconstructive mill have adopted roller-type crimping presses. The third generation of UOE mills appeared between 1968 and 1979, during when the crimping process developed dramatically from roller-type to die-type, and in total there are 16 sets of new mills put in use and two sets of old ones reconstructed all over the world. Since the 1990s, there have been more than ten large diameter JCO (including PFP) or RB production lines constructed in the world, of which JCO lines have adopted the die-type crimping process.