Resumo

KESKINKILIC, E. Sulfide-type inclusion morphologies of a Ca-treated hot-rolled wheel steel. J. S. Afr. Inst. Min. Metall. [online]. 2011, vol.111, n.6, pp.417-422. ISSN 2411-9717.

SYNOPSIS In this study, sulfide-type inclusion morphologies of a Ca-treated hot-rolled wheel steel, Grade-X, were investigated. The specimens taken from the hot-rolled products of Grade-X heats were studied. The size and distribution of elongated sulfide inclusions were examined for the heats of different S levels. Elongated sulfide inclusions were either not observed or rarely encountered when ladle analysis S content was below 50 ppm. The size and relative abundance of sulfide inclusions were reported to increase markedly when the S composition was greater than or equal to 70 ppm and the Ca/S ratio was less than 0.50. The effect of Ti addition (0.010-0.020% Ti) on sulfide-type inclusion morphologies was then investigated for heats having a sulfur content higher than 50 ppm. Addition of Ti was found to have a partial effect on decreasing the size of sulfide-type inclusions under real steelmaking conditions.

Palavras-chave : Sulfide inclusions; Ca-treatment; titanium.

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