优化二冷工艺提高T91连铸坯中心凝固质量  

Optimization of secondary cooling parameter and improvement of center solidification quality of T91 continuous casting bloom

作　　者：邢国成 李涛[1] 孙大利[1] 李刚 XING Guo-cheng;LI Tao;SUN Dali;LI Gang(Technology Department of Fushun Special Steel Co., Ltd., Fushun 113001, Liaoning, China)

机构地区：[1]抚顺特殊钢股份有限公司技术处

出　　处：《连铸》2018年第2期46-49,共4页Continuous Casting

摘　　要：对连铸坯取低倍试片进行酸浸检测分析,中心等轴晶比例为14%,中心裂纹达1.5级以上的比例占50%,并伴有中心缩孔,这些缺陷导致成品材出现探伤不合。采用二次冷却弱冷、并调整各段分配比后,使中心等轴晶比例达到30%,消除了中心缩孔,0.5级以下的中心裂纹出现率100%。按新工艺参数生产的成品材,采用RD探伤后,中心纵波全都合格。The macro-etched samples of bloom were analyzed,which showed the ratio of the central equiaxed crystal was14%,and central cracks above 1.5 degree occupy 50% accompanied with the center cavity. These defects lead to disqualification of ultrasonic flaw detection. By using weak secondary cooling and adjusting the distribution ratio of each zone,the center equiaxed crystal ratio reached 30%,which eliminates the center cavity andthe center crack less than 0.5 degree occurrence100%. According to the new process parameters,the center longitudinal wave is all qualified after the RD inspection.

关 键 词：中心缩孔 中心裂纹 二次冷却 T91 

分 类 号：TF777[冶金工程—钢铁冶金]