FIELD: manufacturing technology.
SUBSTANCE: invention relates to production of steel pipe and its use for production of steel pipeline, tubular pile, tubular tongue or water gate pressure pipeline. Steel pipe is expanded to produce a wavy shape on its outer diameter with a certain amplitude and wavelength.
EFFECT: improved deformability of a steel pipe at loss of pipe resistance.
4 cl, 7 dwg
| Title |
Year |
Author |
Number |
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2012 |
|
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|
RU2824613C2 |
