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| Optimization of secondary cooling parameter and improvement of center solidification quality of T91 continuous casting bloom |
| XING Guo-cheng，LI Tao，SUN Dali， LI Gang |
| （Technology Department of Fushun Special Steel Co.， Ltd.， Fushun 113001， Liaoning， China） |
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Abstract The macro-etched samples of bloom were analyzed， which showed the ratio of the central equiaxed crystal was 14%， and central cracks above 1.5 degree occupy 50% accompanied with the center cavity. These defects lead to disqualification of ultrasonic flaw detection . By using weak secondary cooling and adjusting the distribution ratio of each zone， the center equiaxed crystal ratio reached 30%， which eliminates the center cavity andthe center crack less than 0.5 degree occurrence 100%. According to the new process parameters， the center longitudinal wave is all qualified after the RD inspection.
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Received: 18 September 2017
Published: 27 April 2018
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蔡开科, 程士富. 连续铸钢原理与工艺[M]. 北京: 冶金工业出版社, 2008.
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蔡开科. 连铸坯质量控制[M]. 北京: 冶金工业出版社, 2010.
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2018, Vol. 37 
