METHOD OF PRODUCTION OF INGOTS Russian patent published in 2005 - IPC

FIELD: special electrometallurgy.

SUBSTANCE: the invention is dealt with field of special electrometallurgy, namely to vacuum arc remelting of highly-reacting metals and alloys and may be used at production of ingots of high-alloy titanium alloys. The method provides for: preparation of a consumable electrode to at least double vacuum arc remelting with production during the first remelting of a slip-cast consumable electrode. At that during the first remelting after formation of a molten metal bath its volume is being reduced during the whole process of smelting. At the final remelting of the slip-cast consumable electrode formation of the a molten metal bath is conducted applying an arc peak current to a substrate with a heat clearance of 1-3 mm till production of an ingot of (0.20-0.35)D_c in height, where D_c is a diameter of the crystallizer (in mm). Then the slip-cast consumable electrode is melted by the minimum possible ark current, which is determined from the expression: J_arc = K D_c, where J_arc is an arc currficient of proportionality К=10 (А/mm). Smelting of the slip-cast consumable electrode is conducted keeping 25-45 mm ring-type clearance between a wall of the crystallizer and a lateral surface of the ingot at the value of the arc positive clearance of 10-15 mm. The invention allows to increase production of metal yield of ingots of the second and consequent remeltings by 2.0-2.5 % at the expense of a decrease of liquation and casting defects, and also to produce ingots with a well-melted-through surface without machining the ingots.

EFFECT: the invention allows to increase yield of ingots of the second and consequent remeltings by 2.0-2.5 % and to produce ingots with a well-melted-through surface without machining the ingots.

3 cl, 1 ex