HOT ROLLED TUBE PRODUCTION PROCESS Russian patent published in 2005 - IPC

FIELD: tube rolling of α and (α +β) titanium -base alloys.

SUBSTANCE: process comprises steps of forging ingot to blank; working blank; making central opening in it. Rolling blank in pilger mill and subjecting it to mechanical working. At each transition forging is started at temperature of β-range or at temperature of β- and (α +β ) range , as cooling blank, forging is ended in (α +β) range at forging reduction ratio no less than 20%. Through piercing of solid blank is realized at temperature in β-range. Before rolling in pilger mill pierced blank is cooled till temperature that is by 30 -100 C less than T_pr. Rolling process is performed at deformation rate (3 x 10^-1 s^-1 )^{- (102 s-1 ).}

EFFECT: possibility for making tubes with fine-grain highly uniform microstructure.

1 cl, 2 ex