Alloys or metallic compositions – Titanium base
Reexamination Certificate
2005-02-01
2005-02-01
Jenkins, Daniel (Department: 1742)
Alloys or metallic compositions
Titanium base
C420S420000, C420S421000
Reexamination Certificate
active
06849231
ABSTRACT:
There is provided an α-β type titanium alloy having a normal-temperature strength equivalent to, or exceeding that of a Ti-6Al-4V alloy generally used as a high-strength titanium alloy, and excellent in hot workability including hot forgeability and subsequent secondary workability, and capable of being hot-worked into a desired shape at a low cost efficiently. There is disclosed an α-β type titanium alloy having high strength and excellent hot workability wherein 0.08-0.25% C is contained, the tensile strength at room temperature (25° C.) after annealing at 700° C. is 895 MPa or more, the flow stress upon greeble test at 850° C. is 200 MPa or less, and the tensile strength/flow stress ratio is 9 or more. A particularly preferred α-β type titanium alloy comprises 3-7% Al and 0.08-025% C as α-stabilizers, and 2.0-6.0% Cr and 0.3-1.0% Fe as β-stabilizers.
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Kojima Soichiro
Oyama Hideto
(Kobe Steel, Ltd.)
Jenkins Daniel
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