铸坯中心偏析影响因素分析研究

Analysis and Research on the Factors Influencing Strand Center Segregation

针对宁钢连铸板坯中心偏析缺陷影响因素展开研究,通过生产现场跟踪调查、数据分析及对Minitab统计分析的经验数据进行归纳总结,确定了影响连铸坯中心偏析形成的浇注周期、拉速、恒拉速生产等关键因素及其控制措施,浇注周期由45 min降低至42 min,避开造成高偏析级别的敏感拉速,选择0.9 m/min的拉速生产,通过控制生产节奏,确保连铸机实现恒拉速生产。

Study is performed on the factors influencing strand center segregation in Ninggang. On the basis of tracking survey at production site,data analysis and summary on empirical data from Minitab statistic analysis,key factors influencing casting cycle,withdrawal speed and constant speed casting as well as control measures are determined,i. e.,the casting cycle is reduced from 45 min to 42 min,a withdrawal speed of 0. 9 m/min is selected to avoid the specific withdrawal speed causing high segregation level,constant speed casting is achieved by controlling production pace.