Study on control of corner cracks in cast slabs and its application to designing of continuous slab casters of baosteel Zhanjiang
DING Xiao-lin1， FENG Chang-bao2， LIU Qiang1， YAN Jian-wu1，LUO Gao-qiang1， ZHU Xiao-yong1
1. Continuous Casting Business Section， Iron and Steel Business Division of CISDI Engineering Co.， Ltd.，Chongqing 401122， China 2. Steel Making Plant of Baosteel Zhanjiang Iron and Steel Co.， Ltd.，Zhanjiang 524000， Guangdong， China
Abstract：Corner cracks are very likely to occur in the slabs when peritectic steels， medium carbon steels， boron or niobium micro-alloyed steels are being produced by continuous slab caster， which will lead to edge upwarping and edge cracking of the finished products in the rolling process. To stop the slabs with corner cracks from going down to the rolling mills and affecting the finished rolled product quality， the slabs must be flame scarfed in the continuous casting process， thus causing increases in the operational cost. In 2013， Baosteel decided to relocate the two single-stream 2 300 mm slab casters from Luojing of Shanghai to Zhanjiang of Guangdong. The slabs produced by the slab casters at Baosteel Luojing were observed with serious corner crack problem. To tackle corner cracks， CISDI worked hard together with Baosteel to extensively optimize and improve the bender roller arrangement， segment roller gap accuracy control， secondary cooling zoning， secondary cooling width control， dynamic cooling control model， dynamic soft reduction model， etc.， and eventually the conundrum of corner cracks which were frequent in the slab casters when at Luojing was solved and the occurrence of corner cracks in slabs of peritectic steels， medium carbon steels， boron or niobium micro-alloyed steels was decreased from over 90% to less than 1%. Article focuses on the work done specifically on tackling of corner cracks in the designing stage.
丁小林， 冯长宝， 刘 强， 阎建武， 罗高强， 朱小勇. 宝钢湛江连铸板坯角裂的控制研究及设计实践[J]. , 2017, 36(5): 54-58.
DING Xiao-lin， FENG Chang-bao， LIU Qiang， YAN Jian-wu，LUO Gao-qiang， ZHU Xiao-yong. Study on control of corner cracks in cast slabs and its application to designing of continuous slab casters of baosteel Zhanjiang. , 2017, 36(5): 54-58.
2017, Vol. 36 
