Abstract
This paper presents a study on the design of a multiheat teeming tundish for heavy steel ingots. The effects of dimensions on liquid steel flow pattern and inclusion flotation were studied by physical modelling, which provided basis for a new oval shaped design. The research demonstrated that increasing the bath depth H and, in particular, tundish length L provided positive benefits for inclusion flotation. To optimise the flow patterns of liquid steel and inclusion flotation, the bath depth should be controlled between 1500 and 2000 mm, and the L/H should be controlled between 2·0 and 2·7. Evaluation of a rotor forged from a large ingot produced using the new tundish indicated that the diameter of single equivalent defects decreased from 2·5 to 1·6 mm, and the total oxygen content decreased by 32% when L/H was increased from 0·73 to 2. Therefore, the new tundish effectively improved the quality of forging.
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