발간논문

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Vol.34, No.9, 1211 ~ 1220, 1996
Title
Research Paper - Pyrometallurgy - : Oxide and Sulfide Inclusion Modification by Calcium Treatment in Al - killed Steel
정병준Byung Jun Chung, 김성만Sung Man Kim, 장준섭Joon Sup Jang, 이상은Sang Eun Lee
Abstract
Study in contrast between low and medium carbon Al-killed steels has been made in terms of morphology and composition of the oxide and sulfide inclusions resulting from calcium treatment. CaS activity calculated based on Lu`s model in complex sulfide (Ca,Mn)S inclusions in the medium carbon steel is 0.70±0.12, which is good accordance with the values of Fruehan et al. Inclusions in the low carbon steel was characterized as the calcium aluminates as cores which were enclosed with (Ca,Mn)S layer in comparison with those of the medium carbon steel whose cores were alumina alone surrounded by complex sulfide (Ca,Mn)S. Calcium in the medium carbon steel with the higher concentrations of S and Al reacted preferentially with MnS to Al₂O₃. Converting MnS into (Ca,Mn)S inclusions by the calcium treatment in the medium carbon Al-killed steel will be applied to the manufacturing process for the mold steel leading to the simultaneous improvements in free machinability and etching workability.
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