Effect of Additives on Melting Point of LATS Refining Ladle Slag

钢铁研究学报(英文版), 2007, 14(2): 25-29.

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1.School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China

2.School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China

3.School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China

4.School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China

5.Stainless Steel Branch, Baosteel Group, Shanghai 200431, China

基金项目: Natural Science Foundation of Jiangsu Higher Education Institutions of China(04KJB430022;05KJD450043) 国家自然科学基金(50474037)

Effect of Additives on Melting Point of LATS Refining Ladle Slag

Keywords： LATS refining

To avoid slag sticking on the ladle immersion cover during the LATS refining and alloying process, the effect of Al2O3 on the melting point of the ladle slag was studied and the additives including CaF2, B2O3, Li2O, and CaO were used to decrease the melting point of the ladle slag. The melting point was measured using the hemisphere method. The results show that the addition of Al2O3 to the ladle slag increases the melting point. The fluxing action is not remarkable if only CaF2 or CaO is used as the additive. The fluxing action of the composite additive obtained by the mixing of CaO and CaF2 in the mass proportion of wCaO∶wCaF2=2∶1 is preferred. The fluxing action of B2O3 is also notable. When the B2O3 content in mass percent is in the range from 2% to 10%, the corresponding melting point is 1 380 ℃ to 1 290 ℃. The fluxing action of Li2O is the most remarkable. When the Li2O content is up to 5%, the melting point of the slag is lower than 1 300 ℃.

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Effect of Additives on Melting Point of LATS Refining Ladle Slag

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