| 摘 要： | To investigate the interaction mechanism between 95 Cr saw-wire steel and different refractories,we conducted laboratory experiments at 1873 K.Five crucible materials(SiO_2,Al_2 O_3,MgO·Al_2 O_3,MgO,and MgO-CaO) were used.The results indicate that SiO_2,Al_2 O_3,and MgO·Al_2 O_3 are not suitable for smelting low-oxygen,low-Al]_s 95 Cr saw-wire steel,mainly because they react with the elements in the molten steel and pollute the steel samples.By contrast,MgO-CaO is an ideal choice to produce 95 Cr saw-wire steel.It offers three advantages:(ⅰ) It does not decompose by itself at the steelmaking temperature of 1873 K because it exhibits good thermal stability;(ⅱ) C],Si],and Mn]in molten steel cannot react with it to increase the O] content;and(ⅲ) it not only desulfurizes and dephosphorizes but also removes Al_2 O_3 inclusions from the steel simultaneously.As a result,the contents of the main elements(C],Si],Mn],Cr],N,T.O(total oxygen)) in the steel are not affected and the content of impurity elements(Al]_s,P,and S) can be perfectly controlled within the target range.Furthermore,the number and size of inclusions in the steel samples decrease sharply when the MgO-CaO crucible is used.
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