Thin-walled pipe, metallic flat material and method for producing a thin-walled pipe

A thin-walled pipe (2), comprising:

• a thin metallic flat material (22) rolled or bent into a pipe (2), having longitudinal edges (24, 26) connected to one another by positive interengagement of connecting elements along a connecting portion (6) extending in a longitudinal direction (8) of the thin-walled pipe (2);
• wherein the thin-walled pipe (2) has a first axial pipe end (18) and a second axial pipe end (20);
• wherein the connecting elements are protrusions (10) on a first longitudinal edge (24) of the thin metallic flat material (22) and corresponding recesses (12) on a second longitudinal edge (26) of the thin metallic flat material (22);
• and
• wherein at least one protrusion (10) engages in a corresponding recess (12) so that flanks of the at least one protrusion (10) abut at least partially against respective adjacent flanks of the corresponding recess (12) in the pipe-longitudinal direction (8);
• characterized in that
• the thin metallic flat material (22) has a wall thickness of 0.05-1.00 mm;
• at least one pair (32, 34) of a protrusion flank and of an abutting recess flank, as seen in an axial sectional plane (A-A) extending along the connecting portion (6), in each case has an inclined course from a pipe outer wall to a pipe inner wall, and in each case encloses an angle of 15-75°, including 30-60°, with a radial plane of the thin-walled pipe (2);
• at least one pair (32) of a protrusion flank and of an abutting recess flank, as seen in a sectional plane along the connecting portion (6), in each case has an inclined course with a first oblique direction of extension from the pipe outer wall to the pipe inner wall in the direction of one of the pipe ends (20);
• at least one pair (34) of a protrusion flank and of an abutting recess flank, as seen in a sectional plane along the connecting portion (6), in each case has an inclined course with an opposite second oblique direction of extension from the pipe outer wall to the pipe inner wall in the direction of the other pipe end (18);
• and
• pairs (32) of a protrusion flank and of an abutting recess flank with a first oblique direction of extension, as seen along the connecting portion (6), are arranged alternately with pairs (34) of a protrusion flank and of an abutting recess flank with an opposite second oblique direction of extension, so that the protrusions (28, 30) and recesses (12), as seen in a sectional plane (A-A) along the connecting portion (6), in particular alternately have substantially the shape of a parallelogram (36) and substantially the shape of a trapezoid (38).