脱氧工艺对车轮钢洁净度与大型夹杂物形成的影响

Effect of deoxidation process on the cleanliness and large inclusions formation in wheel steel

通过炼钢工业试验,研究了高硅系列车轮钢采用不同的脱氧工艺对钢的洁净度与大型夹杂物产生的影响,得出如下结论:冶炼全程限制铝脱氧、采用碱度1.8~3.0精炼渣系、钢的成品Al控制在0.006%~0.010%的脱氧造渣工艺方案1,精炼炉渣氧化性较高,钢中氧含量较高,钢中内生夹杂物为CaO⁃SiO_(2)⁃Al_(2)O_(3)⁃MgO类复合物,易因浸入式水口上夹杂物的大量聚集而产生大型夹杂物。冶炼全程使用铝脱氧、采用碱度3.5~3.0精炼渣系、钢的成品Al控制在0.013%~0.018%的工艺方案2,精炼炉渣氧化性较低,钢中氧含量较低,钢中内生夹杂物为CaO⁃Al_(2)O_(3)⁃MgO复合物,浸入式水口上夹杂物聚集而产生大型夹杂物的风险较低。

The influence of deoxidation process on the cleanliness and large inclusions of high silicon wheel steel is studied in the present paper.The results show that the higher oxidation of refining slag and oxygen content in steel are obtained,by restricting aluminum deoxidation with R_(2) of 1.8 to 3.0 and Al content of 0.006%to 0.010%in steel.The endogenous inclusions are mainly constituted of CaO-SiO_(2)-Al_(2)O_(3)-MgO.When the clogging of this type of inclusion falls off,large inclusions are easily found in the final product.After aluminum deoxidation with increasing the slag basicity to the range of 3.5 to 5.0,and controlling the Al content in the range of 0.013%to 0.018%,the lower oxidation in the refining slag and oxygen content in the steel are obtained.As a result,the endogenous inclusions are mainly constituted of CaO-Al_(2)O_(3)-MgO,which is difficulty to clog and then large inclusions are hard to find.