摘要
检测分析了加改质剂（/%：3843Al,2030Al2O3,2731CaO,≤6SiO2,≤6MgO）改质210 t钢包顶渣前后超低碳钢（≤0.01%C）连铸坯中的夹杂物数量和尺寸分布,通过热力学分析,研究了改质剂对钢渣间氧平衡以及连铸坯中夹杂物的影响。结果表明,钢包顶渣改质前的精炼渣样成分为（/%）25.5539.68CaO,8.5115.14SiO2,6.3427.09MgO,5.926.54Al2O3,17.3222.24FeO,3.867.35MnO,改质后渣样成分为（/%）34.3640.43CaO,7.6911.47SiO2,6.427.31MgO,8.3125.54Al2O3,11.9420.78FeO,2.172.63MnO;采用钢包顶渣改质处理,实际渣中aFeO小于与钢液中氧相平衡的aFeO,引起了钢液中的氧通过渣金界面向渣中扩散,从而降低了钢液中氧活度,显著改善钢液的洁净度和降低连铸坯中的夹杂物数量和尺寸,水口结瘤得到明显改善;同时,虽然渣中的aFeO下降较小,但钢液中氧活度得到了明显降低。
The amount and distribution of inclusions in casting slab of ultra-low carbon steel（≤0.01%C） processing in 210 t ladle with and without adding modifying agent（/%：38-43 Al,20 30Al2O3,27 31CaO,≤6SiO2,≤6MgO）to ladle top slag have been examined and analyzed,and the effect of modifying agent on oxygen equilibrium between steel and slag and inclusions in casting slab is studied by thermodynamic analysis.Results show that the ingredient of refining slag sample for ladle top slag without adding modifying agent is（/%） 25.55 39.68 CaO,8.51 15.14SiO2,6.34 27.09 MgO,5.92 6.54Al2O3,17.32-22.24 FeO,3.86 7.35 MnO,and ingredient of refining slag sample for ladle top slag with adding modifying agent is（/%） 34.36 40.43 CaO,7.69 11.47SiO2,6.42 7.31 MgO,8.31 25.54Al2O3,11.94 20.78 FeO,2.17-2.63MnO;with using ladle top slag modification treatment,the actual activity coefficient aFeO in slag is less than that in equilibrium with dissolved oxygen aFeO in steel led to oxygen diffusion from steel to slag through the interface of metal-slag,thus to lower the activity of oxygen in liquid,obviously improve the cleanliness of liquid and decrease the amount and size of inclusions in casting slab,and markedly reduce the nozzle clogging occurrence.Besides,although the decrease of aFeO in slag is small,whereas the activity of oxygen in liquid decreases significantly.
出处
《特殊钢》
北大核心
2015年第3期38-42,共5页
Special Steel
关键词
顶渣改质
杂物
超低碳钢
氧活度
水口堵塞
Top Slag Modification
Inclusion
Ultra-Low Carbon Steel
Oxygen Activity
Nozzle Clogging
