公开(公告)号：US20190314877A1

公开(公告)日：2019-10-17

申请号：US16472238

申请日：2017-12-22

Applicant: SANDVIK INTELLECTUAL PROPERTY AB

Inventor： Olle ERIKSSON ,  Henrik HÄLL

IPC: B21C33/00 ,  B21C37/15 ,  F16L13/007 ,  B21D39/04

Abstract: A connection tube (1) for connecting two tubes (8, 9) of different alloys, wherein the connection tube has a central through-hole extending along a longitudinal axis and comprises a first end portion (2) of a first alloy, 5 a second end portion (3) of a second alloy, and a middle portion (4) which is at least partly double-layered with said second alloy forming an annular inner layer and said first alloy forming an annular outer layer, wherein a metallic bond has been formed between said layers. The inner and outer layers are mechanically interlocked by means of at 10 least one helically extending thread formed in an interface between said layers. The connection tube is manufactured from a base component and an outer component threaded onto the base component to form a work piece, which is hot worked to form a metallic bond. 15