唐钢FTSC工艺薄板坯质量控制的关键技术
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摘要
介绍了唐钢FTSC工艺薄板坯质量控制的关键技术。以结晶器内腔形状和钢种的凝固收缩特性相匹配为原则,采用结晶器宽面漏斗形状+窄面形状+保护渣性能相结合的一体化控制技术,能有效控制薄板坯表面纵裂的发生。并在此基础上形成了包晶钢纵裂控制技术。通过动态液芯压下、LPC液芯控制模型、二冷动态配水三项技术相配合,并采用辊缝仪检测扇形段的对中精度,使薄板坯内部质量达到很好的控制效果。通过采用上述关键技术,使薄板坯表面纵裂发生率由7%降低到0.4%;内部质量按照Mannesmann标准评定,达到中碳钢的内部裂纹平均为1.5级,偏析为1级,低碳钢内部裂纹和偏析均为1级的水平。
Key quality control technologies of FTSC thin slab in Tangsteel was introduced. According to the matching principle between mould cavity shape and solidification shrinkage characteristics of steel grade,by using the integrated control technology of mould wide face funnel shape + narrow face shape + mould powder performance,the longitudinal crack can be controlled on thin slab surface effectively. And the longitudinal crack control technology of peritectic steel on this basis has been developed. Through using dynamic soft reduction,liquid pool control model,dynamic secondary cooling,and the roll gap measuring instrument for detection of segment alignment accuracy,thin slab internal quality is controlled well. By adopting the above key technologies,the slab surface longitudinal crack rate reduced from 7% to0.4%,and according to the internal quality evaluation of Mannesmann standard,internal crack of medium carbon steel achieve level 1.5,segregation achieve level 1,internal cracks and segregation of low carbon steel achieve level 1.
Key quality control technologies of FTSC thin slab in Tangsteel was introduced. According to the matching principle between mould cavity shape and solidification shrinkage characteristics of steel grade,by using the integrated control technology of mould wide face funnel shape + narrow face shape + mould powder performance,the longitudinal crack can be controlled on thin slab surface effectively. And the longitudinal crack control technology of peritectic steel on this basis has been developed. Through using dynamic soft reduction,liquid pool control model,dynamic secondary cooling,and the roll gap measuring instrument for detection of segment alignment accuracy,thin slab internal quality is controlled well. By adopting the above key technologies,the slab surface longitudinal crack rate reduced from 7% to0.4%,and according to the internal quality evaluation of Mannesmann standard,internal crack of medium carbon steel achieve level 1.5,segregation achieve level 1,internal cracks and segregation of low carbon steel achieve level 1.
引文
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[3]张洪波,杨杰,吴振刚,等.薄板坯连铸用结晶器技术的研究与优化[J].连铸,2008,(2):31.
[4]陶红标,吕晓军,席常锁,等.薄板坯连铸结晶器锥度设计技术研究及应用[J].钢铁,2012,47(1):29.
[5]李梦英,张洪波,王兰玉,等.薄板坯连铸漏斗结晶器的工艺特性分析[J].连铸,2014,(3):7.
[6]张瑞忠,刘耀辉,翟荣灿.邯钢薄板坯连铸低碳钢保护渣的开发及优化[J].连铸,2008,(2):36.
[7]赵紫锋,王新华,张炯明,等.中碳钢板坯保护渣性能优化及提高拉速工业试验研究[J].钢铁,2009,44(3):24.
[8]刘亮,张彬.包晶钢纵裂成因分析及工艺控制[J].连铸,2011,(2):9.
[9]倪有金,庞炜光,孙彦辉,等.包晶钢板坯表面纵裂纹的形成与防止[J].连铸,2010,(4):2.
[10]许庆太,杨撷光,吴春雷,等.连铸坯内部裂纹缺陷的检验和分析[J].连铸,2015,40(5):5.
[11]王国连,曹磊.宽厚板连铸坯中间裂纹成因分析及控制[J].中国冶金,2017,27(10):56.
[12]蔡开科.连铸坯质量控制[M].北京:冶金工业出版社,2010:289.
[13]钟晓丹,刘军,邹宗树.改善350 mm×470 mm矩形坯宏观偏析研究与实践[J].连铸,2016,41(2):64.
[14]汪洪峰,陶林,王勇.高强钢连铸板坯中心偏析的分析及改善措施[J].连铸,2017,42(5):34.
[15]王彦锋,许中波.连铸薄板坯和传统连铸板坯的凝固质量对比研究[J].连铸,2004,(4):40.
[16]苏亮,阳军,田乃媛,等.珠钢薄板坯连铸液芯压下对比试验研究[C]//2006年薄板坯连铸连轧国际研讨会.广州:中国金属学会,2006.