连铸工艺参数对GCr15钢碳偏析的影响

来源期刊：钢铁2010年第11期

论文作者：胡文豪 朱施利

文章页码：48 - 52

关键词：连铸； 凝固参数； GCr15钢； 碳偏析

Key words：continuous casting； solidification parameter； steel GCr15； carbon segregation

摘    要：为了减轻GCr15钢中的碳偏析,使其能更优用于深冲领域,采用了铸坯横截面钻样的方法和枝晶形貌微观显形的方法研究了铸坯碳偏析的分布规律,采用大生产数据回归的方法研究了生产过程中连铸工艺参数对碳偏析指数的影响。结果表明:适当提高二冷强度可以有效改善碳分布均匀程度,铸坯截面对角线方向碳分布比纵横方向均匀;从铸坯表面到中心枝晶间距逐渐增大,中心部位最严重,而增大二冷强度有利于减弱枝晶偏析;回归分析表明偏析指数与二冷比水量的相关性最大,而与钢水过热度的相关性不强。

Abstract: The distribution of carbon segregation on casting blank were investigated to reduce carbon segregation and improve deep-drawing property in steel GCr15,using the methods of casting blank drilled and dendritic microstructure analyzed.And the effect of process parameters in continuous casting on carbon segregation was studied through the regressive analysis of the data in producing process.The results indicate that the average degree of carbon distribution can be improved with increase in secondary cooling intensity,and diagonal carbon distribution is more average than vertical and horizontal’s in section of GCr15 steel billet;the dendritic distance becomes more and more obvious from exterior to center in casting blank,especially serious in center.And it is helpful to weaken dendritic segregation with increase in secondary cooling intensity.Regressive analysis shows segregation index has maximal relationship with water ratio in secondary cooling,and has low relationship with superheat degree of steel.