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2011-Sustainable Industrial Processing Summit
|Flogen Star OUTREACH
|2291-1227 (Metals and Materials Processing in a Clean Environment Series)
Inclusions in specimens taken from continuously cast slabs of 304 stainless steels were observed to evaluate their maximum size in a unit area. Two different types of slab specimens were sampled to understand the effect of deoxidizer; one was Si/Mn killed and another was Al killed. Statistics of extreme values in a square root of area were applied to comprehensively express the distribution of inclusions. As a result, the distribution of the extreme value of the Si/Mn killed has been found to be larger. The largest size of inclusion detected in 1 mm2 as a unit area ranged between 3 and 17 µm for the Si/Mn killed steel while it ranged between 2 and 5 µm for the Al killed. Thereby, inclusion with maximum size existing in arbitrary area is able to be predicted. Regarding the compositions, inclusions were identified as silicate type for the Si/Mn killed, while those composed of CaO, MgO and Al2O3 were identified for the Al killed. The difference in inclusion compositions is therefore considered to bring the difference in size distributions.