Continuous casting method for ingots obtained from titanium or titanium alloy

2:

• The continuous casting method as claimed in claim 1, wherein
• a number of the plasma torches is 2, and
• the plasma torches are moved, during the step of moving the plasma torches, such that when one plasma torch is located directly vertically above the vicinity of an edge of the mold, the other plasma torch is located directly vertically above a central part of the mold.

3:

• The continuous casting method as claimed in claim 2, wherein
• assuming that a radius of the melt surface is R, the plasma torch is moved, during the step of moving the plasma torches, to locate its center on a trajectory according to an inner circumferential arc having a radius of 0<r1<R/2 from a center of the melt surface and an outer circumferential arc having a radius of R/2<r2<R from the center of the melt surface, which inner and outer circumferential arcs are connected by a straight line, and
• a plasma output of each plasma torch during movement according to the inner circumferential arc is controlled to be lower than a plasma output of the respective plasma torch during movement according to the outer circumferential arc.

4:

• The continuous casting method as claimed in claim 3, wherein each of the plasma torches is moved, during the step of moving the plasma torches, within a range of either one of two divided semicircles, as viewed from above the melt surface.

5:

• The continuous casting method as claimed in claim 3, wherein a distance of R/2 or more is maintained between the centers of the plasma torches during the step of moving the plasma torches.

6:

• The continuous casting method as claimed in claim 4, wherein a distance of R/2 or more is maintained between the centers of the plasma torches during the step of moving the plasma torches.