Abstract
The results of an end-to-end quality evaluation of continuous cast SS400 steel slabs, followed by its hot-rolled thick-sheet products in ship-delivered batches, are presented. The evaluation of the frequency distribution of defects for each of the continuous casting machines (CCMs) revealed the following: even during control fire cleaning, the surface quality of slabs from CCM No. 1 was slightly lower (1.1–2.0%) than from CCM No. 2; the finished sheets from slabs casted at CCM No. 1 have a better quality than from slabs casted at CCM No. 2. At the same time, on both machines, the quality of slabs from strand No. 2 is better than from strand No. 1. The unstable internal quality of the sheet with a thickness of 30–45 mm was due to restrictions imposed on the maximum thickness of the sheet which was 25.0 mm. During microstructural analysis of the causes of cracks and segregation nature, it was found that the presence of non-metallic inclusions in the sheet structure serves, in fact, as a source of crack development. Analysis using energy-dispersive x-ray spectroscopy (EDX) showed that nonmetallic inclusions in the dominant mass are manganese sulfides.
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