简介概要

Prediction of spatial distribution of the composition of inclusions on the entire cross section of a linepipe steel continuous casting slab

来源期刊:JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第2期

论文作者:Qiang Ren Yuexin Zhang Ying Ren Lifeng Zhang Jujin Wang Yadong Wang

文章页码:147 - 158

摘    要:In the current study, the transformation in the composition of non-metallic inclusions from the molten steel to the solidified steel was studied and the composition distribution of inclusions on the cross section of a linepine continuous casting slab was predicted. During cooling and solidification of the continuous casting strand, Al2O3-Ca O inclusions reacted with the bulk steel and transformed to Ca S-Al2O3-Mg O-(Ca O) ones in the continuous casting slab. The composition of inclusions on the cross section of the slab varied with locations due to the varied cooling rate. A model was established to predict the distribution of the composition of inclusions on the cross section of the continuous casting slab, coupling solidification and heat transfer of the continuous casting slab, the kinetic mass transfer of the dissolved elements in the solid steel, and thermodynamic calculation of inclusion transformation at different temperatures. The composition transformation of inclusions mainly occurred at the temperature between the liquidus and solidus of the linepipe steel. Inclusions were mainly Ca S-Al2O3-Mg O-(Ca O) in slab center and were Mg OAl2O3-Ca O-Ca S within the subsurface of the slab. In the slab, the transformation fraction of inclusions was less than 10 % at corners while it reached 70 % at 50 mm below the surface of the slab.

详情信息展示

Prediction of spatial distribution of the composition of inclusions on the entire cross section of a linepipe steel continuous casting slab

Qiang Ren1,Yuexin Zhang1,Ying Ren1,Lifeng Zhang2,Jujin Wang1,Yadong Wang1

1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University

摘 要:In the current study, the transformation in the composition of non-metallic inclusions from the molten steel to the solidified steel was studied and the composition distribution of inclusions on the cross section of a linepine continuous casting slab was predicted. During cooling and solidification of the continuous casting strand, Al2O3-Ca O inclusions reacted with the bulk steel and transformed to Ca S-Al2O3-Mg O-(Ca O) ones in the continuous casting slab. The composition of inclusions on the cross section of the slab varied with locations due to the varied cooling rate. A model was established to predict the distribution of the composition of inclusions on the cross section of the continuous casting slab, coupling solidification and heat transfer of the continuous casting slab, the kinetic mass transfer of the dissolved elements in the solid steel, and thermodynamic calculation of inclusion transformation at different temperatures. The composition transformation of inclusions mainly occurred at the temperature between the liquidus and solidus of the linepipe steel. Inclusions were mainly Ca S-Al2O3-Mg O-(Ca O) in slab center and were Mg OAl2O3-Ca O-Ca S within the subsurface of the slab. In the slab, the transformation fraction of inclusions was less than 10 % at corners while it reached 70 % at 50 mm below the surface of the slab.

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