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《Iron and Steel》 2014-01
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Removal Behavior of Inclusion During RH Vacuum Treatment of X70 Pipeline Steel

YANG Guang-wei;CHU Ren-sheng;WANG Xin-hua;HUANG Fu-xiang;WANG Wan-jun;YIN Yu-qun;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing;Nanjing Iron and Steel Co. ,Ltd.;  
Inclusion morphology,composition,number and size at various times of the RH vacuum treatment were investigated on X70 pipeline steel with ASPEX. Results suggest that: The inclusions are mainly liquid globular CaO-Al2O3 with a small amount of MgO throughout RH vacuum treatment. Inclusion number decreases with time and decreases by 70% after 28 min RH vacuum treatment. Inclusion number after RH treatment can be dramatically reduced by reducing inclusions before RH treatment. The total inclusions and inclusions with size 1-5 μm is monotonously decreased in number,while inclusions over 5 μm firstly increase then decrease after reaching the maximum. It takes more time for bigger inclusions to reach the maximum. The average diameter of inclusions increases from 2. 2-2. 5 μm before RH to 3. 0-3. 9 μm after RH.
【Fund】: 国家自然科学基金资助项目(51204014)
【CateGory Index】: TF769.4
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