Investigations of Inclusion Modification in High Grade Pipeline Steel

查看全文 作　　者：LIU Jian-hua1, BAO Yan-ping1, WANG Ming2, REN Yi2, ZHANG Shuai2, WANG Shuang2 (1. Institute of Metallurgical Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Technology Center of ANSC, Angang Steel Company Limited, Anshan 114001, Liaoning, China)

出　　处：《Journal of Iron and Steel Research(International)》索引2011年第18卷第S2期,共7页

摘　　要：SiCa line was injected into liquid pipeline steel at the end of LF refining as calcium treatment, and samples were taken from liquid steel in ladles before and after calcium treatment, liquid steel in mould, and slabs. Results show that Ca content in steel decreased obviously after calcium treatment with production, and the compositions, morphologies and sizes of inclusions in steel also varied with time; Al2O3 inclusions turned to be fine irregular CaS-CaO-Al2O3 compound inclusions after calcium treatment, and then to be fine globular CaO-Al2O3 inclusions in mould, and finally changed to be a few larger irregular CaS-CaO-Al2O3 complex inclusions in slabs; reoxidation of molten steel treated by Ca deteriorates effect of calcium treatment. Thermodynamic study revealed that inclusion variations were related with preferential reactions among Ca, Al2O3 and S and precipitation of S in high sulfur capacity CaO-Al2O3 inclusions. New calcium treatment controlling rules were put forward according to the inclusion variations and requirements of pipeline on inclusion controlling. 关键词：PIPELINE STEEL INCLUSION MODIFICATION CALCIUM treatment

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Investigations of Inclusion Modification in High Grade Pipeline Steel

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