Reduction of Tundish Skull and Yield Improvement in Steel Plants Through Physical Modeling of Steelmaking Tundish Systems |
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Authors: | Dipak Mazumdar O P Singh Joy Dutta Shaktimoy Ghosh D Satish S Chakraborty |
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Affiliation: | (1) Department of Materials Science and Engineering, Indian Institute of Technology, Kanpur, 208016, India;(2) Hospet Steel, Hospet, Karnataka, India;(3) JSPL, Raigarh, India;(4) JSW, Torangallu, Karnataka, India;(5) RINL, Vishakhapattnam, India |
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Abstract: | New types of furniture (also termed as flow modifiers or baffles) were incorporated in industrial scale, slab and bloom casting
tundish systems with an aim to reduce residual metal loss (i.e., tundish skull) at the end of sequence casting. To this end,
water model experiments were carried out in which, slag vortexing phenomena during emptying of tundish was studied embodying
different types of furniture into existing tundish designs. These in general indicate that a wedge shaped bottom together
with an embedded pouring box applied in conjunction have the potential to reduce tundish skull and improve yield losses significantly.
In addition, limited residence time distribution measurement experiments were made to investigate metallurgical performance
of modified design tundish systems. These indicate that deployment of new furniture with minor design modifications, despite
contributing to a reduction in tundish capacity (10–12%), do not influence metallurgical performance of steelmaking tundish
systems to any significant extent. Accordingly, designs of currently employed slab (32 and 37 tonnes capacity respectively)
and bloom casting tundish (10 and a 17 tonnes capacity respectively) systems were modified in four different steel mills and
plant trials conducted to assess the extent of yield improvement. Significant improvements in yield losses, to the extent
of 50–60%, have been confirmed by the industry during sequence casting. |
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