PROCESS FOR PRODUCTION OF EXPANSION COATED PIPE AND COATED PIPE PRODUCED BY THIS PROCESS

摘要

PROCESS FOR THE PRODUCTION OF EXPANSION COATED PIPE AND COATED PIPE PRODUCED BY THIS PROCESS. A process for producing an expansion coated pipe, with or without heating, wherein a coated pipe (1) comprises at least one outer tube of metallic material (10) and one inner tube of metallic material (20). ), the inner tube of metal material (20) having a flow limit lower than the flow limit of the outer tube (23), and an outer diameter smaller than the inner diameter of the outer tube. The process for producing coated pipe comprises an assembly step (34) between the tubes (10, 20), wherein the inner tube is inserted into the outer tube, and at least one mechanical expansion step (36), comprising displacing a mandrel (2) longitudinally and internally to the inner tube (20) while the outer tube and inner tube are held in a fixed position, the outer diameter of the mandrel (2) being greater than the inner diameter of the outer tube. When the tubes are subjected to a cold expansion process, a "linear tube" is obtained which is characterized by the mechanical union between the tubes. When the tubes undergo a hot expansion process, a "clad tube" is obtained which is characterized by a metallurgical joint between the tubes.