堆垛缓冷对连铸坯中心偏析的影响

来源期刊：钢铁2010年第10期

论文作者：沈世雕 黄福祥 陈书浩 王新华 王万军

文章页码：47 - 51

关键词：连铸坯； 堆垛缓冷； 中心偏析； 带状组织

Key words：continuous casting slab； stacking slow-cooling； center-segregation； band structure

摘    要：研究了轧制前堆垛缓冷处理对连铸坯中心偏析的影响。通过对试验铸坯横断面的低倍硫印检验和沿铸坯厚度方向上的化学分析以及对轧后钢板的断面组织观察,发现轧前堆垛缓冷处理减轻了铸坯中心碳偏析和轧后钢板带状组织。堆垛缓冷48 h的铸坯中心偏析级别由C类2.0下降到C类1.5;堆垛缓冷36 h的铸坯轧后钢板与堆垛缓冷24 h的试样相比,其断面带状组织明显减轻,且没有明显连续的珠光体带状组织。

Abstract: The effect of stacking slow-cooling before rolling on the center-segregation of continuous casting slab was investigated.By the macroscopic sulphur print test over the cross section of testing slabs as well as analyzing the chemical compositions of the samples along the thickness direction and observing the cross section structure of rolled plate,it is found out that the effect of stacking slow-cooling before rolling on the center carbon segregation in the slab and the band structure in the rolled plate is obvious.The grade of center-segregation in the casting slab after 48 h stacking slow-cooling decreased from C2.0 to C1.5;the band structure on the cross section of the plate rolled from the casting slab after 36 h stacking slow-cooling is obviously slighter than that in the casting slab after 24 h stacking slow-cooling,and there is no significant pearlite band structure throughout the view field.