| 摘要 |
<p>PURPOSE:To restrain and uniformize melting depth in the horizontal direction of a steel ingot by shifting the flow passage of DC current during remelting in a complex steel ingot producing method by a DC electroslag remelting. CONSTITUTION:A surface plate 5 is rotated so as not to rotate an electrode 12 for current-collecting fitted to the surface plate, and a consumable electrode 11 is concentrically inserted into the inner part of a cylindrical steel ingot case 10 laid on the surface plate 5 to start the electroslag remelting. The consumable electrode 11 becomes the molten metal and rotating flow in the circular peripheral direction is developed therein by electromagnetic field generated between the consumable electrode 11 and the surface plate 5, and the molten metal bath 17 becomes a solidified metal 18 to fill the cavity in the inner part of the steel ingot 10. At this time, the flow passage of the DC current flowed into the electrode 12 is shifted to the circular peripheral direction of the steel ingot 10. Shifting of this current flow passage is executed while rotating the steel ingot 10 in the reverse direction to the rotating direction of the slag bath 16 and the molten metal bath 17. By this method, heat transmission quantity to the steel ingot 10 is reduced and the melting depth is reduced and the melting in the horizontal direction of the steel ingot is uniformized.</p> |
