Formation mechanism and control of corner transverse cracks of CCNB-contained slabs

被引:0
|
作者
Zhu, Guo-Sen [1 ]
Zhu, Zhi-Yuan [1 ]
Liu, Jianhui [2 ]
Bai, Xuejun [2 ]
机构
[1] Shougang Grp, Res Inst Technol, Beijing 100041, Peoples R China
[2] Shouqin Metal Mat Co Ltd, Shougang Grp, Qinhuangdao, Peoples R China
来源
SOHN INTERNATIONAL SYMPOSIUM ADVANCED PROCESSING OF METALS AND MATERIALS, VOL 7: INDUSTRIAL PRACTICE | 2006年
关键词
Nb-contained steel; corner transverse cracks; secondary cooling; CC slab;
D O I
暂无
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Research on the formation mechanism and control of corner transverse cracks was carried out. The optical microscope and SEM were applied to analyze the characteristics of cracks. It is found that the cracks occur at the relatively lower temperature due to unbending strain and have almost nothing to do with the mold cooling and powder. The keys to prevent corner transverse cracks are to optimize the corner temperature of slab and maintain the good state of casting machine. Increasing casting speed and decreasing the cooling water flux at the corner in the unbending segments, resulting in mild cooling, were applied during investigation to control corner temperature above the upper limit temperature of the No.3 brittle zone of Nb-contained steel tested by Gleeble-1500 system. As a result, corner transverse cracks were minimized, but centerline segregation got worse. And then increasing the cooling water flux at the corner (intensive cooling) was applied to make corner temperature below the lower limit temperature of the No.3 brittle zone. Great diminution of both corner transverse cracks and centerline segregation was achieved finally.
引用
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页码:329 / +
页数:3
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