Patent ID: 8881792
Filing Date: 2014-11-11
Classification: B22D,C22B

Abstract:
1. A method for manufacturing a titanium alloy ingot (the titanium alloy being allowable to be pure titanium), comprising the steps of: (a) melting a titanium material or titanium scrap material (hereinafter referred to as “titanium material”) by a cold crucible induction melting (hereinafter referred to as “CCIM”) in such a manner that the following expression (1) can be satisfied: wherein A=P/(V/S) wherein y: the period [min] for the melting, A: a thermal balance parameter, P: the applied electric power [kW] in the CCIM, V: the volume [m S: the surface area [m (b) supplying, after the step (a), the resultant titanium material, which has been melted (hereinafter referred to as the “melted titanium material”), to a cold hearth, and separating an inclusion having a large specific gravity which is more than 5 g/cm (c) supplying, into a mold, the titanium alloy, in which the inclusion, the specific gravity of which is large, has been separated by precipitation, thereby yielding the titanium alloy ingot.