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以废杂铜再生生产的水平连铸黄铜铸坯为研究对象,研究铸坯中元素的宏观偏析,以及铸坯直径对宏观偏析的影响。结果表明,铸坯下表面处铜含量最低,从下到上其含量逐渐增加,在距离铸坯底部约30 mm处,铜含量有一个明显的增加,而后一直到铸坯的顶部,其变化幅度很小。铸坯下表面处铅含量最高,而后呈快速下降的变化规律,在20 mm内下降了约1.1%,再向铸坯的顶部变化时,总体上分布比较均匀,在130 mm内,最大波动约为0.21%。在同样的连铸条件下,减小铸坯直径,可以部分的降低宏观偏析的幅度,但是宏观偏析区域所占比例不会明显的减小。铜的分布不均匀主要是由于铅的分布不均匀造成的,并提出了解决铅偏析的方法。
The horizontal continuous casting brass slabs produced by the regeneration of scrap copper were taken as the research object to study the macro segregation of the elements in the slab and the influence of slab diameter on the macro segregation. The results show that the content of copper is the lowest at the lower surface of slab, and the content increases from bottom to top. There is a significant increase of copper content about 30 mm from the bottom of slab, and then reaches the top of slab, Very small. The lead content at the lower surface of the slab is the highest, and then decreases rapidly by about 1.1% within 20 mm. When the top of the slab changes, the distribution of the lead is relatively uniform. Within 130 mm, the maximum fluctuation is about 0.21%. Under the same continuous casting conditions, reducing the slab diameter can partially reduce the magnitude of macro-segregation, but the proportion of macro-segregation area will not obviously decrease. The uneven distribution of copper is mainly caused by the uneven distribution of lead, and a solution to lead segregation is proposed.