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| Effects of Transition Metal Oxides on Thermal Conductivity of Mould Fluxes |
| QIU Xin1,XIE Bing1,QING Xue-mei2,DIAO Jiang1,HUANG Qing-yun1,WANG Shui-bo1 |
1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
2. Wuhan Iron and Steel Design and Research Institute Engineering Technology Company, Wuhan 430223, Hubei, China |
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Abstract The thermal conductivity of the mould fluxes containing transition metal oxides was measured by hotline method at different temperatures. The relationship between the thermal conductivity of mold fluxes and the contents of transition metal oxides was discussed. The synthetic slags were composed of 30. 0%-35. 4% CaO, 34. 7%-38. 6% SiO2, 6% Al2O3, 9% Na2O, 14. 4% CaF2, 0-4% Cr2O3 and 0-8% MnO in mass percent. The results indicated that Cr2O3 and MnO had a negative effect on thermal conductivity of mold fluxes. The thermal conductivity of mold fluxes was about 0. 25-0. 55 W/(m��K) when the temperature reached 1300 ��, and it increased sharply to about 1. 32-1. 99 W/(m��K) when the temperature reduced from 1300 to 1000 ��. The thermal conductivity of mold fluxes containing Cr2O3 and MnO was 10%-25% lower than those of original fluxes. The decrease in thermal conductivity was attributed to the change of molecular structure of mold fluxes. In addition, the poor integrity and regulation of polycrystal structure, complexity of crystal structure, and effects of impurities in the boundary and lattice distortion leaded to the reduction in the thermal conductivity. Na2CrO4, Mn2SiO4 and other minor phases were also found in the samples containing Cr2O3 and MnO, respectively.
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Received: 16 July 2012
Published: 18 November 2013
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| Fund:Item Sponsored by Ph. D. Programs Foundation of the Education Ministry of China |
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| [1] |
LI Jian-min������JIANG Mao-fa��. Effect of mold fluxes on slab surface crack for 20Mn23AlV[J]. Chinese Journal of Iron and Steel, 2017, 52(9): 48-53. |
| [2] |
LONG Xiao,HE Sheng-ping,WANG Qian. Factors influencing roughness of solidified mold flux film for peritectic steel continuous casting[J]. Chinese Journal of Iron and Steel, 2017, 29(7): 551-555. |
| [3] |
LONG Xiao��HE Sheng-ping��WANG Qian. Experiment on solidification and composition segregation of solidified mold flux film for peritectic steel continuous casting[J]. Chinese Journal of Iron and Steel, 2017, 52(5): 43-46. |
| [4] |
LUO Yan-zhao��JI Chen-xi��DENG Xiao-xuan��PAN Hong-wei��ZENG Zhi��CUI Yang. Optimization of mold flux to improve surface quality of ultra-low carbon IF steel[J]. Chinese Journal of Iron and Steel, 2017, 52(4): 38-43. |
| [5] |
HUANG Ting��WEN Guang��hua��BAI Bin��wen��TANG Ping��GAO Jin��xing. Leaching mechanisms of ions from mold flux and its effect on water quality[J]. Chinese Journal of Iron and Steel, 2017, 29(3): 191-194. |
| [6] |
MA Xiao-mei. Cause analysis of the abnormal failure of the 82B wire rod[J]. Chinese Journal of Iron and Steel, 2017, 35(3): 45-48. |
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2013, Vol. 20 
