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| Analysis and control of transverse corner cracking formation on middle carbon steel in thin slab casting |
| ZHANG Jian-jun1,2，ZHANG Hui1，XI Chang-suo1，TAN Wen2，WANG Chun-feng3 |
（1. National Center of Continuous Casting Technology， Central Iron and Steel Research Institute， Beijing 100081，China
2. Research and Development Center， Wuhan Iron and Steel Co.， Ltd.， Wuhan 430080， Hubei， China
3. CSP Mill， Wuhan Iron and Steel Co.， Ltd.， Wuhan 430080， Hubei， China） |
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Abstract Aimed at transverse corner cracks on middle carbon steel during thin slab casting，the samples with cracks of typical middle-carbon steel（50CrV4） was analyzed through the methods of metallographical observation，high temperature plasticity analysis and numerical simulation about second cooling. The cause of transverse corner cracks on the middle-carbon steel in traditional casting process was that the temperature at slab corner was 850 ℃， which was in No.3 Brittleness Temperature Area between 650-945 ℃. According to the features of caster in WISCO CSP plant，several key measures were carried out，including high casting speed（4.0-4.2 m/min），increasing second cooling water flow rate at the front segment and decreasing second cooling water flow rate at the back segment and edge of slab，and improving the equipment precision. The temperature at slab edge of middle carbon steel increased. Transverse corner cracks of hot-rolled sheets were controlled. Each performance of hot-rolled product can meet customers’ requirements.
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Received: 10 May 2017
Published: 14 November 2017
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2017, Vol. 52 
