论文部分内容阅读
为优化高速车轮钢大圆坯的内部质量,比较了2种二冷制度下,铸坯二冷段的表面温度、凝固组织与宏观偏析的区别。结果表明:2种二冷制度下的铸坯在矫直段的表面温度均高于900℃,处于车轮钢高温塑性区,可避免产生矫直裂纹;铸坯的等轴晶率差别不大,在过热度小于55℃的条件下,均得到了较对称的凝固组织与良好的内部质量;区别在于,制度1条件下的圆坯中心偏析较轻,中心缩孔较小,但是中心疏松面积较大,且沿半径方向上的偏析波动更为剧烈,对其之后的轧制和成品的质量更为不利,不适合用于高品质车轮钢的生产。
In order to optimize the internal quality of the round billet of high-speed wheel steel, the difference of the surface temperature, solidification microstructure and macro-segregation of the secondary cooling section under two secondary cooling systems was compared. The results show that the surface temperature of the slab under the two secondary cooling regimes is higher than 900 ° C in the straightening section and is in the high temperature plastic zone of the wheel steel to avoid straightening cracks; When the superheat is less than 55 ℃, the symmetrical solidified structure and good internal quality are obtained. The difference is that the center of the round billet is less segregated and the center shrinkage is smaller under the condition of system 1, but the center loose area is smaller Large, and the segregation along the radius of the more volatile, its subsequent rolling and finished product quality is more unfavorable, not suitable for the production of high quality wheel steel.