The effects of Fe 2O 3 addition in MgO CaO refractory on desulfurization of liquid iron were studied by SEM, EDA and chemical analysis. Fe 2O 3 of 1 % and 4 % were added to MgO CaO refractory as the lining of gr...The effects of Fe 2O 3 addition in MgO CaO refractory on desulfurization of liquid iron were studied by SEM, EDA and chemical analysis. Fe 2O 3 of 1 % and 4 % were added to MgO CaO refractory as the lining of graphite crucible in which 150 g iron powder with sulfur of 0 15 % was charged. It is found that when the sample is heated at 1 600 ℃ for 40 min, 60 min and 90 min, the addition with Fe 2O 3 of 1 % improves desulfurization greatly. However, the desulfurization ratio of the refractory with Fe 2O 3 addition of 4 % is less than that with Fe 2O 3 addition of 1 %. For the soaking time of 90 min, the desulfurization ratio is less than those of 40 min and 60 min. These phenomena were explained by the contrary roles of O 2- and Fe 2+ formed by reaction between liquid iron and Fe 2O 3 on desulfurization.展开更多
To investigate the interaction mechanism between 95 Cr saw-wire steel and different refractories,we conducted laboratory experiments at 1873 K.Five crucible materials(SiO2,Al2 O3,MgO·Al2 O3,MgO,and MgO-CaO)were u...To investigate the interaction mechanism between 95 Cr saw-wire steel and different refractories,we conducted laboratory experiments at 1873 K.Five crucible materials(SiO2,Al2 O3,MgO·Al2 O3,MgO,and MgO-CaO)were used.The results indicate that SiO2,Al2 O3,and MgO·Al2 O3 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 Al2 O3 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.展开更多
文摘The effects of Fe 2O 3 addition in MgO CaO refractory on desulfurization of liquid iron were studied by SEM, EDA and chemical analysis. Fe 2O 3 of 1 % and 4 % were added to MgO CaO refractory as the lining of graphite crucible in which 150 g iron powder with sulfur of 0 15 % was charged. It is found that when the sample is heated at 1 600 ℃ for 40 min, 60 min and 90 min, the addition with Fe 2O 3 of 1 % improves desulfurization greatly. However, the desulfurization ratio of the refractory with Fe 2O 3 addition of 4 % is less than that with Fe 2O 3 addition of 1 %. For the soaking time of 90 min, the desulfurization ratio is less than those of 40 min and 60 min. These phenomena were explained by the contrary roles of O 2- and Fe 2+ formed by reaction between liquid iron and Fe 2O 3 on desulfurization.
基金support from the National Key Research and Development Program of China(No.2016YFB0300105)the Transformation Project of Major Scientific and Technological Achievements in Shenyang(No.Z17-5-003)the Fundamental Research Funds for the Central Universities(No.N172507002)。
文摘To investigate the interaction mechanism between 95 Cr saw-wire steel and different refractories,we conducted laboratory experiments at 1873 K.Five crucible materials(SiO2,Al2 O3,MgO·Al2 O3,MgO,and MgO-CaO)were used.The results indicate that SiO2,Al2 O3,and MgO·Al2 O3 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 Al2 O3 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.
