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《Iron & Steel》 2017-12
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Optimization for internal quality in wide and heavy die billets by soft reduction

LI Mao-yin;YANG Shu-feng;LI Jing-she;GAO Wei;GU Yu;CHEN Zheng-yang;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing;  
To eliminate the central segregation and porosities in wide and heavy billets of plastic die steel 1.231 1(450 mm×2 180 mm),the pin-shooting experiments combined with mathematical simulation by the software of Pro CAST have been carried out to measure slab shells' thickness as well as intuitively display the process of slab solidification and heat transmission. The position of soft reduction facilities were determined according to the center solid fraction of slab in different positions which were directly exported by Pro CAST. Then the study of soft reduction was arranged and the industrial experiments were carried out systematically on position,amounts and ratio of soft reduction. The results showed that the position and rate of reduction is significant to macroscopic quality. The internal porosities were effectively eliminated after the position of soft reduction was moved from f_s=0.30~0.70 to f_s=0.50~0.85. The degree of segregation especially the width was reduced remarkably after the reduction rate was raised from 0.8 to 1.4 mm/m.
【Fund】: 国家自然科学基金资助项目(51674023)
【CateGory Index】: TF777
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