公开(公告)号：US20160207086A1

公开(公告)日：2016-07-21

申请号：US14913885

申请日：2014-07-23

申请人： VALLOUREC TUBOS DO BRASIL S.A.

发明人： Julio Marcio SILVEIRA E SILVA ,  Timo EBELING ,  Hezick DA SILVA PERDIGAO ,  Danielle GRANHA GIORGINI ,  Gustavo ALVES PINHEIRO ,  Jochen Peter AMES ,  Antonio Wagner DA SILVA PENNA

IPC分类号： B21C37/15 ,  F16L58/00 ,  F16L9/02

CPC分类号： B21C37/154 ,  B21C37/06 ,  F16L9/02 ,  F16L58/00

摘要： A process for producing a multilayer pipe by expansion is disclosed, with or without heating, in which a multilayer pipe (1 ) comprises at least one outer pipe of metallic material (10) and an inner pipe of metallic material (20), the inner pipe of metallic material (20) having a yield strength lower than the yield strength of the outer pipe (23) and an external diameter smaller than the internal diameter of the outer pipe. The process for producing the multilayer pipe comprises a mounting step (34) between the pipes (10, 20), wherein the inner pipe is inserted inside the outer pipe, and at least one mechanical expansion step (36), comprising moving a mandrel (2) longitudinally and internally in the inner pipe (20) while the outer pipe and the inner pipe are held at a fixed position, wherein at least part of the mandrel (2) has a greater external diameter than the internal diameter of the inner pipe. When the pipes are subjected to a process of cold expansion, a “lined pipe” is obtained, which is characterized by mechanical bonding between the pipes. When the pipes are subjected to a process of hot expansion, a “clad pipe” is obtained, which is characterized by metallurgical bonding between the pipes.

摘要翻译： 公开了一种用于通过膨胀制造多层管的方法，其中多层管（1）包括至少一个金属材料外管（10）和金属材料（20）的内管，其中内层 具有低于外管（23）的屈服强度的屈服强度的金属材料管（20），外径小于外管内径。 制造多层管的方法包括在管（10,20）之间的安装步骤（34），其中内管插入外管内，以及至少一个机械膨胀步骤（36），包括移动心轴 2）在内管（20）中纵向和内部，而外管和内管被保持在固定位置，其中心轴（2）的至少一部分具有比内管内径更大的外径 。 当管道经受冷膨胀过程时，获得“衬里管道”，其特征在于管道之间的机械结合。 当管道经受热膨胀过程时，获得“复合管”，其特征在于管道之间的冶金结合。