METHOD OF MAKING HOLLOW TUBULAR BLANK FOR PRODUCING SEAMLESS TUBES FROM PSEUDO-ALPHA AND (ALPHA+BETA)-TITANIUM ALLOYS Russian patent published in 1999 - IPC

FIELD: tube production. SUBSTANCE: method comprises steps of forging ingot to rod at several transitions and at temperature of α-range in transitions from first until last but one and at temperature of (α+β)-range in last transition; cutting rod by lengths of multiple value, drilling axial hole in it, extruding intermediate billet at normalized ratio of temperature and elongation values, cutting received blank by lengths of multiple value, boring axial opening, turning lateral surface and finally extruding billet at normalized ratio of temperature and elongation values. Temperature and elongation values at intermediate and final extrusion processes are calculated according to claimed formulae. EFFECT: finely dispersed uniform microstructure along thickness of tube wall. 1 cl