易切削钢方坯凹陷原因分析及控制
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摘要
对1215MS牌号易切削钢坯表面凹陷缺陷,采用抛丸、酸洗、金相、电子探针和能谱仪检测分析凹陷的特征,结合生产实践,研究分析凹陷产生原因及影响因素。试验研究表明,结晶器采用高振频、低振幅的正弦振动方式,降低结晶器冷却强度,提高二次冷却的均匀性,抑制坯壳过早收缩,优化保护渣性能,降低渣的黏度,提高浸入式水口对中精度,能够有效控制1215MS钢坯凹陷发生。
For the surface indentations on billet of the 1215MS free-cutting steel,the characteristics of the indentation were detected by shot blasting,pickling,metallographic analysis,electron probe and energy spectrometer. Combined with the production practice,the causes and influence factors of the indentation were studied. The experimental research shows that the indentation can be improved effectively and avoided by adopting sinusoidal vibration with high frequency and low amplitude for the mold,reducing the mold cooling rate,restraining constriction of billet shell early,optimizing the properties of mold lubricant,reducing the viscosity of slag,increasing the accuracy of SEN,and promoting the homogeneity of secondary cooling.
For the surface indentations on billet of the 1215MS free-cutting steel,the characteristics of the indentation were detected by shot blasting,pickling,metallographic analysis,electron probe and energy spectrometer. Combined with the production practice,the causes and influence factors of the indentation were studied. The experimental research shows that the indentation can be improved effectively and avoided by adopting sinusoidal vibration with high frequency and low amplitude for the mold,reducing the mold cooling rate,restraining constriction of billet shell early,optimizing the properties of mold lubricant,reducing the viscosity of slag,increasing the accuracy of SEN,and promoting the homogeneity of secondary cooling.
引文
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[2]阎清军,陈玉清.低碳钢连铸坯角部纵向凹陷及纵裂的探讨[J].连铸,1995,1(3):28.
[3]韩永刚,何庆文,粱建国.20号钢连铸坯表面凹陷成因及对策[J].连铸,2007,1(4):25.
[4]张新文,黄建军,杜志明,等.80号钢表面凹陷分析及预防措施[J].连铸,2013,1(1):42.
[5]肖卫军,洪军,朱神中.低碳钢连铸方坯凹陷形成原因分析及控制工艺[J].武钢技术,2008,46(4):8.
[6]陈军,戴继雄,邢耀进.改善易切削钢XY1215铸坯实物质量[J].金属材料与冶金工程,2016,30(5):35.
[7]刘明华,刘正,王海川.连铸坯表面凹陷和纵裂分析[J].炼钢,2000,16(6):58.
[8]汪洪峰,姜加和,江中块.包晶钢连铸板坯表面质量的控制[J].冶金丛刊,2004,150(2):1.
[9]程锁平,张乔英,倪立伟.影响亚包晶钢铸坯表面纵裂纹的因素研究[J].安徽冶金科技职业学院学报,2015,25(3):5.
[10]杨君胜.150 mm方坯形状缺陷的成因与对策[J].连铸,1997,1(5):23.
[11]岳峰,崔衡,李朋欢等.非正弦振动在方坯的应用[J].连铸,2011,1(5):24.
[12]李朋欢.酒钢结晶器非正弦振动连铸工艺实践[J].山西冶金,2014,148(2):62.
[13]范建文,赵军普,姚明路,等.高碳铬轴承钢连铸大方坯角部凹陷裂纹分析[J].连铸,2018,43(1):59.