HIGH-STRENGTH FASTENERS AND WORKPIECES OF ALPHA/BETA TITANIUM ALLOY FASTENERS Russian patent published in 2020 - IPC C22C14/00 C22F1/18 

FIELD: metallurgy.

SUBSTANCE: workpiece of titanium alloy fastening product includes subjected to hot rolling, treatment for solid solution and aging of alpha/beta titanium alloy consisting essentially of, wt. %: from 3.9 to 4.5 of aluminium, from 2.2 to 3.0 of vanadium, from 1.2 to 1.8 of iron, from 0.24 to 0.3 of oxygen, to 0.08 of carbon, to 0.05 nitrogen, not more than 0.3 other elements in total, titanium and random impurities, wherein other elements consist essentially of: one or more of tin, zirconium, molybdenum, chromium, nickel, silicon, copper, niobium, tantalum, manganese and cobalt, wherein the weight percentage of each such element is 0.1 or less, and boron and yttrium, wherein the weight percentage of each such element is less than 0.005. Fastener article has ultimate tensile strength of at least 180 ksi (1241 MPa) and double-shear strength of at least 108 ksi (744.6 MPa).

EFFECT: invention relates to metallurgy, namely to titanium alloys having high strength/weight ratio, which can be used for making fasteners.

12 cl, 5 dwg, 4 tbl, 7 ex