Tubular element and assemblies

1. A tubular element, comprising:

a first tubular portion comprising a first metal or alloy and a second tubular portion comprising a second metal or alloy, the first and second tubular portions extending along a longitudinal direction,

wherein the first tubular portion has a first length,

wherein the first tubular portion extends inside the second tubular portion along a first portion of the first length and outside the second tubular portion along a second portion of the first length,

wherein an interface between the first tubular portion and the second tubular portion comprises a metallic bond and a mechanical interlocking,

wherein at least a portion of the interface extends within a fixed diameter range along the longitudinal direction,

wherein the second tubular portion comprises a first end portion arranged around the first tubular portion,

wherein the second tubular portion comprises a sealing surface extending circumferentially around the second tubular portion at the first end portion,

wherein the second tubular portion comprises an alignment portion at the first end portion, and

wherein the alignment portion extends from a first end of the second tubular portion at the first end portion towards the sealing surface.

2. The tubular element according to claim 1 , wherein the second tubular portion comprises a circumferentially extending shoulder or flange at the first end portion, and wherein the sealing surface is formed at least partially by the shoulder or flange.

3. The tubular element according to claim 1 , wherein at least part of the alignment portion comprises a threaded outer portion.

4. The tubular element according to claim 1 , wherein a second end portion of the first tubular portion is provided with outer threads.

5. The tubular element according to claim 4 , comprising a connection member provided with inner threads configured to engage with the outer threads of the first tubular portion.

6. The tubular element according to claim 1 , wherein a second end portion of the first tubular portion is provided with an even outer surface.

7. The tubular element according to claim 1 , wherein the second metal or metal alloy is selected from a ferritic iron chromium aluminium (FeCrAl) alloy.

8. The tubular element according to claim 1 , wherein the interface between the first tubular portion and the second tubular portion is formed by hot working.

9. The tubular element according to claim 1 , wherein the interface between the first tubular portion and the second tubular portion is formed by extrusion.

10. The tubular element according to claim 1 , wherein the interface between the first tubular portion and the second tubular portion is formed by extrusion.

11. A tubular assembly, comprising:

a tubular element according to claim 1 , and

a tube made of a same metal or metal alloy as the second tubular portion,

wherein the tube is welded to the second tubular portion or is arranged in threaded engagement with the second tubular portion.

12. An assembly, comprising:

a wall member and a tubular element according to claim 1 ,

wherein the wall member comprises a first layer made from a first material and a second layer made from a second material,

wherein a through hole extends through the wall member, and

wherein the tubular element extends through the through hole with the sealing surface at the second tubular portion abutting against the second layer.

13. The assembly according to claim 12 , wherein the first tubular portion is fastened against the first layer of the wall member.

14. The assembly according to claim 13 , wherein the first tubular portion is fastened with a weld against the first layer of the wall member.

15. An assembly, comprising:

a wall member and a tubular element according to claim 6 ,

wherein the wall member comprises a first layer made from a first material and a second layer made from a second material,

wherein a through hole extends through the wall member,

wherein the tubular element extends through the through hole with the sealing surface at the second tubular portion abutting against the second layer, and

wherein the first tubular portion is fastened against the first layer of the wall member with the connection member provided with inner threads engaging with the outer threads of the first tubular portion.

16. An assembly, comprising:

a wall member and a tubular element according to claim 1 ,

wherein the wall member comprises a first layer made from a first material and a second layer made from a second material,

wherein a through hole extends through the wall member,

wherein the tubular element extends through the through hole with the sealing surface at the second tubular portion abutting against the second layer, and

wherein the alignment portion abuts against at least one of the first and second layers inside the through hole.

17. An assembly, comprising:

a wall member and a tubular element according to claim 3 ,

wherein the wall member comprises a first layer made from a first material and a second layer made from a second material,

wherein a through hole extends through the wall member,

wherein the tubular element extends through the through hole with the sealing surface at the second tubular portion abutting against the second layer,

wherein the wall member in the through hole is at least partially provided with inner threads, and

wherein the threaded outer portion of the alignment portion engages with the inner threads.

18. A tubular assembly, comprising:

a tubular element according to claim 1 , and

a tube made of a same metal or alloy as the first tubular portion,

wherein the tube is welded to the first tubular portion or is arranged in threaded engagement with the first tubular portion.

19. An assembly, comprising:

a wall member and a tubular element,

wherein the wall member comprises a first layer made from a first material and a second layer made from a second material,

wherein a through hole extends through the wall member,

wherein the tubular element extends through the through hole with the sealing surface at the second tubular portion abutting against the second layer,

wherein the tubular element includes a first tubular portion comprising a first metal or alloy and a second tubular portion comprising a second metal or alloy, the first and second tubular portions extending along a longitudinal direction,

wherein the first tubular portion has a first length,

wherein the first tubular portion extends inside the second tubular portion along a first portion of the first length and outside the second tubular portion along a second portion of the first length,

wherein an interface between the first tubular portion and the second tubular portion comprises a metallic bond and a mechanical interlocking,

wherein at least a portion of the interface extends within a fixed diameter range along the longitudinal direction,

wherein the second tubular portion comprises a first end portion arranged around the first tubular portion, and

wherein the second tubular portion comprises a sealing surface extending circumferentially around the second tubular portion at the first end portion.

20. An assembly, comprising:

a wall member and a tubular element,

wherein the wall member comprises a first layer made from a first material and a second layer made from a second material,

wherein a through hole extends through the wall member,

wherein the tubular element extends through the through hole with the sealing surface at the second tubular portion abutting against the second layer,

wherein the first tubular portion is fastened against the first layer of the wall member with the connection member provided with inner threads engaging with the outer threads of the first tubular portion,

wherein the tubular element includes a first tubular portion comprising a first metal or alloy and a second tubular portion comprising a second metal or alloy, the first and second tubular portions extending along a longitudinal direction,

wherein the first tubular portion has a first length,

wherein the first tubular portion extends inside the second tubular portion along a first portion of the first length and outside the second tubular portion along a second portion of the first length,

wherein an interface between the first tubular portion and the second tubular portion comprises a metallic bond and a mechanical interlocking,

wherein at least a portion of the interface extends within a fixed diameter range along the longitudinal direction,

wherein the second tubular portion comprises a first end portion arranged around the first tubular portion,

wherein the second tubular portion comprises a sealing surface extending circumferentially around the second tubular portion at the first end portion, and

wherein a second end portion of the first tubular portion is provided with an even outer surface.