High strength alpha/beta titanium alloy fasteners and fastener stock

Patent metadata

Field	Value
Publication number	US-10513755-B2
Application number	US-90385110-A
Country	US
Kind code	B2
Filing date	Oct 13, 2010
Priority date	Sep 23, 2010
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

An article of manufacture selected from a titanium alloy fastener and a titanium alloy fastener stock including an alpha/beta titanium alloy comprising, in percent by weight: 3.9 to 4.5 aluminum; 2.2 to 3.0 vanadium; 1.2 to 1.8 iron; 0.24 to 0.3 oxygen; up to 0.08 carbon; up to 0.05 nitrogen; titanium; and up to a total of 0.3 of other elements. In certain embodiments, article of manufacture has an ultimate tensile strength of at least 170 ksi (1,172 MPa) and a double shear strength of at least 103 ksi (710.2 MPa). A method of manufacturing a titanium alloy fastener and a titanium alloy fastener stock comprising the alpha/beta alloy is disclosed.

First claim

I claim:

1. An article of manufacture selected from a titanium alloy fastener and a titanium alloy fastener stock, the article of manufacture including a hot rolled, solution treated and aged alpha/beta titanium alloy comprising, in percent by weight:
3.9 to 4.5 aluminum;
2.2 to 3.0 vanadium;
1.2 to 1.8 iron;
0.24 to 0.3 oxygen;
up to 0.08 carbon;
up to 0.05 nitrogen;
titanium; and
up to a total of 0.3 of other elements;
wherein the article of manufacture has a longitudinal ultimate tensile strength (UTS) of at least 196 ksi (1,351 MPa) and a double shear strength of at least 108 ksi (744.6 MPa), and wherein the article of manufacture comprises a diameter of up to 0.25 inches (6.35 mm).

2. The article of manufacture of claim 1 , wherein the other elements consist essentially of one or more of tin, zirconium, molybdenum, chromium, nickel, silicon, copper, niobium, tantalum, manganese, and cobalt, wherein the weight percent of each such element is 0.1 or less, and boron and yttrium, wherein the weight percent of each such element is less than 0.005.

3. The article of manufacture according to claim 1 , wherein the fastener comprises one of a bolt, a nut, a stud, a screw, a washer, a lock washer, and a rivet.

4. An article of manufacture selected from a titanium alloy fastener and a titanium alloy fastener stock, the article of manufacture including a hot rolled, solution treated and aged alpha/beta titanium alloy consisting essentially of, in percent by weight:
3.9 to 4.5 aluminum;
2.2 to 3.0 vanadium;
1.2 to 1.8 iron;
0.24 to 0.3 oxygen;
up to 0.08 carbon;
up to 0.05 nitrogen;
no more than a total of 0.3 of other elements;
titanium; and
incidental impurities;
wherein the other elements consist essentially of one or more of tin, zirconium, molybdenum, chromium, nickel, silicon, copper, niobium, tantalum, manganese, and cobalt, wherein the weight percent of each such element is 0.1 or less, and boron and yttrium, wherein the weight percent of each such element is less than 0.005; and
wherein the article of manufacture has a longitudinal ultimate tensile strength (UTS) of at least 196 ksi (1,351 MPa) and a double shear strength of at least 108 ksi (744.6 MPa), and wherein the article of manufacture comprises a diameter of up to 0.25 inches (6.35 mm).

5. The article of manufacture according to claim 4 , wherein the fastener comprises one of a bolt, a nut, a stud, a screw, a washer, a lock washer, and a rivet.

Assignees

• Bryan David J
• Ati Properties Llc

Inventors

• Bryan David J

Classifications

• C22F1/18

  High-melting or refractory metals or alloys based thereon · CPC title

• C22C14/00 Primary

  Alloys based on titanium · CPC title

• F16B35/00

  Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws ({F16B33/008 takes precedence; joining sheets or plates using screws with two separate threads F16B5/0275; using screws with adjustment sleeves F16B5/0283}; thread cutting screws F16B25/00) · CPC title

• A61L27/06

  Titanium or titanium alloys · CPC title

• B62D29/00

  Superstructures, {understructures, or sub-units thereof,} characterised by the material thereof {(B62D33/044, B62D33/048 take precedence)} · CPC title