Material for between high-strength titanium alloy cold forging

摘要

PROBLEM TO BE SOLVED: To provide a high-strength titanium alloy billet for cold forging which is a billet for cold forging with a cylindrical shape and is characterized in having ≥700 MPa tensile strength by addition of low-cost reinforcing elements and also having superior cold forgeability (deformability and isotropy of metal flow) and where pressing is applied in a direction of height of the cylindrical shape.;SOLUTION: Respective contents of Fe, O, N and C as low-cost reinforcing elements and an oxygen equivalent value Q are regulated to values within prescribed ranges, respectively, to secure ≥700 MPa tensile strength. A β-phase composed of a body-centered cubic crystal having many slip systems is made present to some extent by making Fe content to 0.5 to 1.3 mass% and integrated crystal orientation of an α-phase as a main phase is regulated so that it satisfies prescribed relations in view of the slip systems and a cold forging direction to obtain cold forgeability more excellent than conventional ones.;COPYRIGHT: (C)2008,JPO&INPIT