Analysis and control of black line defect on the edge of wide and heavy plate
LI Ren-Jie1,2，WANG Hao3，4，SU Cheng4，ZHANG Yuan1，4，LI Jie5
1. School of Materials and Metallurgy， Inner Mongolia University of Science and Technology， Baotou 014010， Inner Mongolia，China 2. Baotou Steel Group Company Office， Baotou 014010， Inner Mongolia， China 3. State Key Laboratory of Advanced Metallurgy， University of Science and Technology Beijing， Beijing 100083，China 4. The Rare Earth Steel Plates Plant of Baotou Iron and Steel Co.， Ltd.， Baotou 014010， Inner Mongolia， China 5. Tianjin Iron and Steel Group Co.， Ltd.， Tianjing 300301， China
Abstract：In this paper， the black line defect at the edge of the thick and heavy plate is analyzed and studied. The results of the drill hole on the slab corner and tracking rolling test show that the black line at the edge of the plate is folded by the angle of the slab during the rolling process. Process control analysis and practice show that by reducing the temperature difference between the top and bottom surface of the slab， can reduce the degree of defects extending to the plate internal， reduce the temperature difference and the ministry of interior to the blooming mill between the plate edge， can improve the bonding effect of rolling process on edge black line. The angle of the casting slab is processed so that the angle of the casting slab is close to the arc， and the defect can be reduced. Meanwhile， according to the product specification， reasonable arranged the slab section，broadening ratio can be designed to a minimum as far as possible，in order to removed the defect by the normal steel plate edge trimming.
李人杰，王 皓，宿 成，张 沅 ，李 杰5. 宽厚板边部黑线缺陷分析与控制[J]. 中国钢铁期刊网, 2017, 36(03): 71-74.
LI Ren-Jie，，WANG Hao，，SU Cheng，ZHANG Yuan，，LI Jie5. Analysis and control of black line defect on the edge of wide and heavy plate. Chinese Journal of Iron and Steel, 2017, 36(03): 71-74.
2017, Vol. 36 
