中间包覆盖剂中的Cr_2O_3对二次氧化的影响
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摘要
通过管式电阻炉,模拟了中间包覆盖剂对铝脱氧钢的二次氧化,在实验室条件下研究了MgO-CaO-SiO_2-Al_2O_3-Cr_2O_3中的Cr_2O_3对铝脱氧钢二次氧化的影响。结果表明,钢中的总氧含量、铝损和中间包覆盖剂中的FeO含量都随着中间包覆盖剂中Cr_2O_3含量的增加而增加。在增加氧分压后,硅和铬都会发生二次氧化且硅的二次氧化比铬剧烈得多,并且随着保温时间的延长,覆盖剂中的Cr_2O_3、SiO_2和FeO都会再次发生二次氧化向钢液中传氧。
The effect of Cr_2O_3 in the MgO-CaO-SiO_2-Al_2O_3-Cr_2O_3 on the reoxidation in the tundish was studied by using a tube resistance furnace under laboratory conditions.It was found that the total oxygen content,the aluminum loss in the steel and the FeO content in the tundish cover power increased with the increase of Cr_2O_3.After increasing the partial pressure of oxygen,Si and Cr are oxidized and the oxidated degree of Si is much more severe than Cr.With the prolongation of the holding time,Cr_2O_3,SiO_2 and FeO in the tundish cover power will be reduced resulting in the reoxidation of the molten steel again.
The effect of Cr_2O_3 in the MgO-CaO-SiO_2-Al_2O_3-Cr_2O_3 on the reoxidation in the tundish was studied by using a tube resistance furnace under laboratory conditions.It was found that the total oxygen content,the aluminum loss in the steel and the FeO content in the tundish cover power increased with the increase of Cr_2O_3.After increasing the partial pressure of oxygen,Si and Cr are oxidized and the oxidated degree of Si is much more severe than Cr.With the prolongation of the holding time,Cr_2O_3,SiO_2 and FeO in the tundish cover power will be reduced resulting in the reoxidation of the molten steel again.
引文
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[2] Dongchul P,Inho J,Rhee P C H,et al.Reoxidation of Al-Ti containing steels by CaO-Al2O3-MgO-SiO2slag[J].Transactions of the Iron and Steel Institute of Japan,2004,44(10):1669.
[3] YANG G,WANG X,HUANG F,et al.Influence of reoxidation in tundish on inclusion for Ca-treated Al-killed steel[J].Steel Research International,2014,85(5):784.
[4] Yan P,Arnout S,Ende M A V,et al.Steel reoxidation by gunning mass and tundish slag[J].Metallurgical and Materials Transactions:B,2015,46(3):1242.
[5]蔡开科.浇注过程钢水二次氧化[C]//第八届全国连铸学术会议论文集.海口:中国金属学会,2007:43.
[6]郑晓丹,李京社,杨树峰,等.中间包钢水二次氧化过程影响因素研究[C]//钢锭制造技术与管理研讨会论文集.淄博:河北省冶金学会,2016.
[7]常锷.连铸过程钢中夹杂物行为的研究[D].武汉:武汉科技大学,2003.
[8] Kim S H,Song B.Thermodynamic aspects of steel reoxidation behavior by the ladle slag system of CaO-MgO-SiO2-Al2O3-FetO-MnO-P2O5[J].Metallurgical and Materials Transactions:B,1999,30(3):435.
[9] Brooks G A,Rhamdhani M A,Coley K S,et al.Transient kinetics of slag metal reactions[J].Metallurgical and Materials Transactions:B,2009,40(3):353.
[10] QIN Y,WANG X,LI L,et al.Effect of oxidizing slag on cleanliness of IF steel during ladle holding process[J].Steel Research International,2015,86(9):1037.