公开(公告)号：US11679428B2

公开(公告)日：2023-06-20

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 ,  B21D39/04 ,  F16L13/00 ,  F16L13/007

CPC classification number: B21C33/004 ,  B21C37/154 ,  B21D39/04 ,  F16L13/007

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, 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 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.

公开(公告)号：US11054065B2

公开(公告)日：2021-07-06

申请号：US16472461

申请日：2017-12-22

Applicant: SANDVIK INTELLECTUAL PROPERTY AB

Inventor： Olle Eriksson ,  Henrik Häll

IPC: F16L9/14 ,  B21D39/04 ,  F16L58/00

Abstract: Method for manufacturing a composite tube having at least one double-layered portion with an annular outer layer of a first alloy and an annular inner layer of a second alloy provides a base component of the second alloy, having a central through-hole and an externally threaded section, provides an outer component of the first alloy, having an internally threaded section configured to engage with the externally threaded section, forms a tubular work piece by mounting the outer component around the base component such that the internally threaded section is in engagement with the externally threaded section, and hot works the work piece so that a metallic bond is formed between the threaded sections while the mechanical interlock is maintained, and so that the work piece is elongated and its outer diameter is reduced, thus forming a composite tube.