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http://dx.doi.org/10.5228/KSPP.2010.19.5.311

The Formation Behavior of Non-metallic Inclusion in the Ce-added Hyper Duplex STS  

Hong, S.H. (인하대학교 공과대학 신소재공학부)
Jang, P.Y. (인하대학교 공과대학 신소재공학부)
Park, Y.M. (인하대학교 공과대학 신소재공학부)
Byun, S.M. ((주)포스코 기술연구소)
Kim, K.T. ((주)포스코 기술연구소)
You, B.D. (인하대학교 공과대학 신소재 공학부)
Publication Information
Transactions of Materials Processing / v.19, no.5, 2010 , pp. 311-319 More about this Journal
Abstract
Rare earth metal Ce has a relatively low melting point and high specific gravity. Because of its significantly high affinity to oxygen, nitrogen and sulfur, it is highly usable as a steel refining agent. However, because Ce compound has relatively high specific gravity, it is difficult to be separated from molten steel through floatation, and it degrades the purity of molten steel, or may clog the nozzle in continuous casting. Such problem may be solved by using an appropriate deoxidation agent together with Ce and settling molten steel sufficiently after refining. Thus a fundamental study in the formation behavior of non-metallic inclusion in Ce added Hyper Duplex STS melts was investigated. The addition amount of Ce, melt temperature were considered as experimental variables. A main non-metallic inclusion in mother alloy is 51(wt%MnO) - 27.6(wt%SiO$_2$)- 10.9(wt%$Cr_2O_3$). Non-metallic inclusion was dramatically decreased and the particle size was fined as the amount of Ce increased. Moreover (%MnO) and (%SiO$_2$) of non-metallic inclusion were decreased. But (%$Al_2O_3$)were relatively increased. The number of non-metallic inclusion were decreased and the large particle size were increased by increasing the temperature of molten steel.
Keywords
Rare Earth Element; Non-Metallic Inclusion; SEM; Stainless; Melting;
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