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The influence of Al-deoxidation and various amounts of sulphur on Ca-treated steel has been investigated. The effect of sulphur ar aluminium on the modification of oxide inclusions has been reasoned by theoretical thermodynamic equilibrium analysis. The type inclusion formed depends on the aluminium and sulphur contents. For complete oxide shape control in which CaO-rich inclusions forr the sulphur content must be relatively low for Al-killed steel. The oxide inclusion type of the experiments was in surprisingly goc agreement with the prediction of thermodynamics. The influence of calcium and sulphur on the machinability and mechanical properties has also been demonstrated as well as the improvement of isotropy in steel obtained by Ca-addition.
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Wu et al. (1995) studied this question.
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