The entrapment of mold slag is one of the most common sources of sub-surface defects, generally known as laminations, in material rolled from continuously cast stainless steel slabs. The start-up and initial transient state of the casting operation was physically modeled to study the effect of fluid flow properties and operational practices on the entrainment of mold slags during caster start-up. Application of results from modeling of the caster start-up lead to revised start-up procedures at the slab caster at the Washington/Houston operation of Lukens Inc. which improved first slab quality.
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