After the commissioning of its vacuum degasser (RH-KTB) in 1998, Companhia
Siderúrgica de Tubarão (CST) started the development of slabs to be applied as high
value added products, such as ultra-low carbon steel grades (ULC) for automotive
applications. For this purpose, it was necessary to promote the development of a quality
design system, encompassing all stages of steel manufacturing and slab casting at CST,
as well as the steps of finishing rolling and coating. This paper describes the
methodology for development of ULC steels at CST together with the company Sollac-Lorraine
emphasizing the interchange of technical information aiming the continuous improvement.
In this way, the results of the end product surface inspection are correlated with
the technical parameters of steel production, including the quality events of steel
refining and casting, as well as the slab conditioning.