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| Optimization experiment of soft reduction for continuous casting slab |
| ZENG Zhi1，JI Chen-xi1，ZHANG Hong-yan1，LI Xiang-kui2，LI Feng2，YANG Xiao-shan2 |
（1. Research Institute of Technology， Shougang Group Co.， Ltd， Beijing 100043， China
2. Shougang Jingtang Iron and Steel United Co.， Ltd.， Tangshan 063210， Hebei， China） |
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Abstract With the development of the new?steel grades， the requirements of internal quality control for continuous casting slab have been becoming more and more strict. The steel plant of Shougang Jingtang owns four high-efficiency slab casters， equipped with a series of advanced process technologies， including dynamic secondary cooling and dynamic soft reduction. The core of dynamic secondary soft reduction system is the mathematical model of slab temperature distribution field， which is used to calculate the end point of slab solidification online， so as to determine the appropriate reduction area in real time. Taking pipeline steel production for example， the pin shooting test has been carried out for the measurement of solidifying shell thickness to verify the accuracy of the solidification thermal model， proved to be within a relative error of 1.0%. Meanwhile， process comparison test was carried out to study the effect of the soft reduction on central segregation. Results showed that the degree of central segregation decreased with the soft reduction amount increased from 4.2 mm to 7.2 mm， and the type C segregation of pipeline slab could be controlled within Class 0.5 without any cracks.
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Received: 27 April 2018
Published: 29 September 2018
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2018, Vol. 37 
