为了改善高碳钢82A断面180 mm×240 mm矩形坯内部质量，首次在凝固末端进行了永磁搅拌工业试验。根据射钉结果，确定了搅拌器安装位置为距弯月面7m。搅拌器磁体采用液压系统驱动，通过增加永磁搅拌器入口油压来提高搅拌频率。随着搅拌频率从0增加到5 Hz，矩形坯凝固中心平均碳偏析值从1.18降到1.09。此外，永磁搅拌改善连铸坯中心疏松和缩孔效果显著，铸坯中心疏松0.5级的比例增加了40%，中心缩孔0级比例从0增加到20%。
To improve the internal quality of high carbon 82A steel,such as center carbon segregation in rectangular bil-let with the size of 180 mm × 240 mm,the final permanent magnet stirring was applied in a rectangular billet caster. Based on the pin-shooting results,the installation position of the final permanent magnet stirring was 7 m from the me-niscus. The permanent magnet was driven by a hydraulic system and the stirring frequency was increased by increasing the inlet oil pressures. Results showed that the mean center segregation degree of carbon decreased from 1.18 to 1.09 as the stirring frequency increased from 0 to 5 Hz. Besides,the implementation of new casting technology provided an es-sential improvement in other internal qualities of high carbon rectangular billets,such as the grades of center porosity and shrinkage cavity. The grade of center porosity that was less than 0.5 increased by 40%and the grade of shrinkage cavity that equaled to 0 improved from 0 to 20%.
参考文献
| [1] | Flemings M.C.;.Our Understanding of Macrosegregation: Past and Present[J].ISIJ International,20009(9):833-841. |
| [2] | GEORGE KRAUSS.Solidification, Segregation, and Banding in Carbon and Alloy Steels[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,20036(6):781-792. |
| [3] | 蔡小锋;包燕平;林路;顾超.82B 盘条断口典型形貌及产生原因分析[J].中国冶金,2015(8):1-5. |
| [4] | S. K. CHOUDHARY;Suvankar GANGULY.Morphology and Segregation in Continuously Cast High Carbon Steel Billets[J].ISIJ International,200712(12):1759-1766. |
| [5] | V. Ludlow;A. Normanton;A. Anderson.Strategy to minimise central segregation in high carbon steel grades during billet casting[J].Ironmaking & Steelmaking: Products and applications,20051(1):68-74. |
| [6] | 冯军;陈伟庆;王晓峰;王庆贤;苏旺.凝固末端电磁搅拌对高碳钢内部质量的影响[J].钢铁,2006(11):26-28. |
| [7] | 贺洪印;刘海涛;陈伟庆;王国君;付军;刘辉杰.高碳钢小方坯连铸参数优化及铸坯中心偏析控制[J].钢铁钒钛,2011(1):84-88. |
| [8] | 王刚;赵志升;王明坤;苏本显;吴英杰.铝合金熔炼中永磁搅拌的应用效果[J].轻合金加工技术,2011(6):25-30. |
| [9] | 樊忠义 .环保型蓄热燃烧技术与永磁搅拌技术在熔铝炉的应用研究[D].西安建筑科技大学,2010. |
| [10] | S.I.Chung.Numerical analysis of effect of electromagnetic stirring on solidification phenomena in continuous casting[J].Ironmaking & Steelmaking: Products and applications,19965(5):425-432. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%