SEAMLESS MULTILAYER COMPOSITE PIPE

摘要

The present invention relates to a method and an apparatus (100, 200) for manufacturing a seamless multilayer composite pipe (1), and a seamless multilayer composite pipe (1). The method of manufacturing a seamless multilayer composite pipe (1) comprises the steps of a) providing a seamless metal pipe (3) with at least one continuous layer (5) covering its inner surface, and b) passing the seamless metal pipe (3) through a unit (109, 209) in order to reduce the diameter of the seamless metal pipe (3) by cold working. The apparatus (100, 200) comprises said continuous layer (5) covering unit and said cold working unit (109, 209). A seamless multilayer composite pipe comprises a seamless metal pipe (3) with at least one continuous layer (5) covering its inner surface, wherein said continuous layer is mechanically compressed.