Beta-type titanium alloy
AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsKazuhiro TAKAHASHI, Hideki FUJII, Kenichi MORI
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Abstract
The present invention provides a β-type titanium alloy that includes, by mass %, when Al: 2 to 5%, 1) Fe: 2 to 4%, Cr: 6.2 to 11%, and V: 4 to 10%, 2) Fe: 2 to 4%, Cr: 5 to 11%, and Mo: 4 to 10%, or 3) Fe: 2 to 4%, Cr: 5.5 to 11%, and Mo+V (total of Mo and V): 4 to 10% in range, and a balance of substantially Ti. These include Zr added in amounts of 1 to 4 mass %. Furthermore, by making the oxygen equivalent Q 0.15 to 0.30 or leaving the alloy in the work hardened state or by applying both, the tensile strength before aging heat treatment can be further increased.
Claims4
A β-type titanium alloy, which will consist of an α phase and a β phase after aging, containing, by mass %, Al:
- 2 to 5%, Fe:
- 2 to 4%, Cr:
- 5 to 9%, and Mo:
- 4 to 10% in ranges and having a balance of Ti and unavoidable impurities, and
- when Vicker's hardness is randomly measured at six points in each of three L-cross-sections, a difference between a maximum value and a minimum value thereof is in a range of 10 to 20, and
- the α phase is substantially uniformly precipitated after solution treatment, drawing and aging.
Dependencies are inferred from the claim text.