MANUFACTURING METHOD OF COLD-ROLLED PIPES FROM ALPHA- AND PSEUDO-ALPHA-ALLOYS BASED ON TITANIUM Russian patent published in 2015 - IPC C22F1/18 B21B23/00 B21B3/00 

FIELD: metallurgy.

SUBSTANCE: manufacturing method cold-deformed pipes from α- and pseudo-α-alloys based on titanium involves melting of an ingot, forging of an ingot in β- and α+β-region with ending of forging in α+β-region into an intermediate shell with forging reduction of 2 to 3; piercing is performed at the temperature that is by 30-50°C higher than Tpp, by multiple-cone rolls and a mandrel with the specified geometry with water supply to a deformation zone, rolling of the shell is performed at the temperature that is by 10-90°C lower than Tpp; straightening of the pipe shell is performed at the temperature of 350-400°C, cold rolling is performed with drawing coefficient of 1.5-4.5 at several stages by alternation with intermediate annealing processes at the temperature equal to 600-750°C, and further heat treatment with the ready dimension at the temperature of 580÷650°C.

EFFECT: high mechanical properties of manufactured pipes, as well as high quality of pipe surface.

4 dwg, 3 tbl