Hot and high strength + type titanium alloy and a method for manufacturing the same, and titanium alloy products with excellent workability in cold

摘要

PROBLEM TO BE SOLVED: To provide a titanium alloy excellent in hot and cold workability, which is suitable for the use as a fastener such as a bolt or nut, an automotive engine-related strength component, and the like.;SOLUTION: The high-strength titanium alloy excellent in hot workability and cold workability includes, by mass, 1.0-3.5% of Al, 0.5-1.4% of Fe, 0.2-0.5% of O and 0.03% or less of N, with the balance being Ti and impurities, and has a total elongation exceeding 22% at room temperatures. The method for producing the high-strength titanium alloy excellent in hot workability and cold workability includes; heating and retaining a titanium alloy having the composition range in a range of (β-transformation point -120°C) to (β-transformation point -20°C) followed by cooling at a rate corresponding to water cooling. Further, a strength component such as a fastener such as a bolt and nut or an automotive engine-related member such as a connecting rod or engine valve, which is produced by performing hot processing or further cold processing on the high-strength titanium alloy is also provided.;COPYRIGHT: (C)2012,JPO&INPIT