100t LF精炼渣碱度和Al_2O_3含量对65Mn钢夹杂变质和去除效果的影响  

Effect of 100 t LF Refining Slag Basicity and Al_2O_3 Content on Modification and Removal of Inclusions in Steel 65Mn

作　　者：刘辉杰[1] 万勇[2] 赵和明[1] 李杰[2] 操瑞宏[3] Liu Huijie Wan Yong Zhao Hemingl Li Jie Cap Ruihong(Technology Center, Xinyu Iron and Steel Group Co Ltd, Xinyu 338001 School of Metallurgical Engineering, Anhui University of Technology, Ma＇anshan 243032 The First Steel Plant, Xinyu Iron and Steel Group Co Ltd, Xinyu 338001)

机构地区：[1]新余钢铁集团有限公司技术中心,新余338001 [2]安徽工业大学冶金工程学院,马鞍山243032 [3]新余钢铁集团有限公司第一炼钢厂,新余338001

出　　处：《特殊钢》2017年第4期38-42,共5页Special Steel

摘　　要：100 t LF原精炼终渣(/%:53.8CaO,8.16MgO,16.6SiO_2,17.45Al_2O_3,1.44TFe,1.26S,R3.08)优化成终渣(/%:51.3CaO,6.36MgO,25.0SiO_2,6.73Al_2O_3,2.96TFe,0.76S,R2.05)后,通过降低碱度和渣中Al_2O_3含量,65Mn钢(/%:0.63~0.65C,0.19~0.22Si,0.92~0.96Mn,0.005~0.006S,0.021~0.022P,0.003 5~0.0037T[O])中的夹杂物当量个数由18.4个/mm^2减少到11.3个/mm^2,其平均直径由8.4μm减小到4.5μm。相比原精炼渣系,采用优化渣系的65Mn在LF出站时的钢中Al_2O_3由5.9个/mm^2降低到1.7个/mm^2;其CaO-SiO_2-Al_2O_3和CaO-SiO_2-Al_2O_3-MgO复合夹杂物中Al_2O_3含量由38.3%~44.7%降低到17.5%~28.7%。B类Al_2O_3夹杂物不合格的卷数由6%降至3%。With 100 t LF original refining end slag （/% ： 53.8CaO, 8.16MgO, 16. 6SIO2, 17. 45A1203 , 1.44TFe, 1.26S, R3.08） to improved refining end slag （/% ： 51.3CaO, 6. 36MgO, 25. 0SiO2, 6. 73A1203, 2.96TFe, O. 76S, R2.05 ） by decreasing the basicity and A1203 content in slag, the equivalent number of inclusions in steel 65Mn （/% ： 0. 63 - 0. 65C, 0. 19 - O. 22Si, O. 92 - 0.96Mn, 0. 005 - 0. 006S, 0. 021 - 0. 022P, 0. 003 5 - 0.003 7T [ O ] ） decreases from 18.4 incluisons/mm2 to 11.3 inclusions/mm2 , and the average diameter of inclusions reduces from 8.4 μm to 4. 5 Ixm. As compared with original refining slag by using optimized refining slag the number of A1203 per mmz in steel 65Mn at LF end refining decreases from 5.9 to l. 7 ; and the A1203 content in CaO-SiO--A1203 and CaO-SiO2-A120--MgO compound inclusions decreases from 38. 3% - 44.7% to 17.5% - 28.7% ; and the reject rate of coil due to unqualified B series A1,O, inclusion decreases from 6% to 3%.

关 键 词：100 t LF精炼渣系碱度A12O3 含量夹杂物数量平均直径65Mn钢 

分 类 号：TF769.2[冶金工程—钢铁冶金]