MULTILAYER PIPE WITH PIPE CORE FROM ALUMINIUM ALLOY Russian patent published in 2015 - IPC B32B1/08 B32B15/08 B32B15/20 C22C21/02 C22C21/04 F16L9/147 

FIELD: metallurgy.

SUBSTANCE: invention relates to a multilayer pipe and its use. The multilayer pipe includes a metal pipe with internal and external surfaces, the first polymeric layer contacting with the external surface, and, preferably, the second polymeric layer contacting with the internal surface, and meanwhile the metal pipe is fabricated from the aluminium alloy, containing by weight. %: Si from 1.5 up to 2.45, Fe from 0.5 up to 1.2, Mn from 0.5 up to 1.2, Cu from 0.3 up to 1, Mg from 0.04 up to 0.3, Ti < 0.25, Zn < 1.2 and other impurity or stochastic elements < 0.05 everyone, switching Cr < 0.05 and Zr < 0.05, total < 0.25, and the rest - aluminium.

EFFECT: manufacturing of multilayer pipes with a core from aluminium with improved creep flow properties, in particular with stability to constant and long-term sustained internal pressure.

12 cl, 2 tbl, 1 dwg, 1 ex