Surface and Sub-surface defect reduction using RHI’s refractory solutions

摘要

Continuously cast products can suffer from various defects caused by several factors occurring separately or contemporary during the steel production or casting process. The defects can originate by variations in the secondary metallurgical treatment, as well as problems during ladle to mold transfers, whereas some defects can already be traced back to tapping at the EAF/BOF. Solidification related defects due to mold issues like steel fluid flow may also have their origin in entrained non-metallic inclusions (NMI), tundish slag or mold flux. The subsequent applied stresses to the solidifying steel shell in the secondary cooling zone by the supporting rolls, or even the cooling agent and/or type of introducing the liquid media, can again worsen the product surface and sub-surface quality, if no attention is paid on the machine maintenance.