为优化生产工艺,改变冶炼方法和炉渣组成,进行了齿轮钢20CrMoH生产试验,分析讨论了生产过程钢中的T[O]、低熔点钙铝酸盐非金属夹杂物的形成过程.结果表明,出钢脱氧时加入足够的Al,钢水的T[O]含量降低非常快,当w(FeO)+w(MnO)≤0.5%时,SiO2已经成为钢水氧化的氧源;选用w(CaO)=55%～60%,w=(Al2O3)35%～40%,w(MgO)≤6%的CaO-Al2O3-MgO渣系精炼,可以得到w(T[O])=0.0010%的钢水,夹杂物的变化过程和Ca处理时夹杂物的转变过程类似;钢包渣中w(CaO)/w(Al2O3)的比值为1.50～1.65时,能使钢液中的Al2O3夹杂转变为低熔点的钙铝酸盐,得到与钢液Ca处理相同的效果,在RH真空处理后不再需要钙处理.
参考文献
| [1] | B.-H. Yoon;K.-H. Heo;J.-S. Kim .Improvement of steel cleanliness by controlling slag composition[J].Ironmaking & Steelmaking: Products and applications,2002(3):215-218. |
| [2] | Todoroki H;Mizuno K .Effect of silica in slag on inclusion compositions in 304 stainless steel, deoxidized with aluminum[J].ISIJ International,2004(8):1350-1357. |
| [3] | Hideaki SUITO;Ryo INOUE .Thermodynamics on Control of Inclusions Composition in Ultraclean Steels[J].ISIJ International,1996(5):528-536. |
| [4] | Won-Gap SEO;Woong-Hee HAN;Jeong-Sik KIM .Deoxidation Equilibria among Mg, Al and O in Liquid Iron in the Presence of MgO centre dot Al_2O_3 Spinel[J].ISIJ International,2003(2):201-208. |
| [5] | Higuchi Yoshihiko;Numata Misuhiro;Fukagwa Shin .Inclusion Modification by Calcium Treatment[J].ISIJ International,1996,36(s):151-154. |
| [6] | Scott R. Story;Thomas J. Piccone;Richard J. Fruehan .Inclusion Analysis to Predict Casting Behavior[J].Iron & Steel Technology,2004(9):163-169. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%