HIGH STRENGTH ALPHA/BETA TITANIUM ALLOY FASTENERS AND FASTENER STOCK Russian patent published in 2016 - IPC C22C14/00 C22F1/18 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, particularly to fasteners made from alpha/beta titanium alloy. Fastener made from alpha/beta titanium alloy is subjected to hot rolling, processing to solid solution and ageing, containing, wt%: aluminium from 3.9 to 4.5, vanadium from 2.2 to 3.0, iron from 1.2 to 1.8, oxygen from 0.24 to 0.3, carbon up to 0.08, nitrogen up to 0.05, other elements not more than 0.3 in total, titanium and unintentional impurities - balance. Method for production of fasteners includes provision of alloy, hot rolling; obtained workpiece is annealed at temperature from 1200°F (648.9°C) to 1400°F (760°C) for 1 hour to 2 hours, cooling in air, machining to preset product size, processing to solid solution at a temperature of 1500°F (815.6°C) to 1700°F (926.7°C) for 0.5 hours to 2 hours, cooling with rate at least equivalent to air cooling, ageing at temperature from 800°F (426.7°C) up to 1000°F (537.8°C) for 4 hours to 16 hours and air cooling.

EFFECT: production of light-weight and high-strength fasteners.

14 cl, 5 dwg, 4 tbl, 8 ex