Altering the width of slabs during continuous casting - where chill frame possessing the new width required is placed in mould, so narrow mould walls can be adjusted to new width

摘要

The mould consists of two long side walls between which two narrow walls can be moved to vary the slab width. When a change in width is required, the feeding of molten metal via a casting pipe into the mould is stopped, and the slab is drawn out of the mould until only a small amt. of the melt remains in the mould; drawing is then stopped. A frame is then located in the mould to form a chill in the remaining melt, and molten metal is fed into the frame, the width of which corresponds with the new slab width required. After a solid skin has formed inside the frame, the narrow mould walls are moved inwards or outwards so they butt against the outside of the frame; and casting with the new slab width can then be continued. The width of the slab can be increased or reduced without the danger of a run-out, and within a min. amt. of time.