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Effect of CaO/Al2O3 ratio of ladle slag on formation behavior of inclusions in Mn and V alloyed steel

Title
Effect of CaO/Al2O3 ratio of ladle slag on formation behavior of inclusions in Mn and V alloyed steel
Author
박주현
Keywords
Mn-V-alloyed steel; non-metallic inclusions; secondary refining; ladle slag; refractory-slag-metal-inclusion (ReSMI) multiphase reactions simulation; MgAl2O4 spinel; STAINLESS-STEEL; MOLTEN STEEL; NONMETALLIC INCLUSIONS; FORMATION MECHANISM; SPINEL INCLUSIONS; CALCIUM TREATMENT; MGAL2O4 SPINEL; LIQUID-IRON; DEOXIDATION; ALUMINUM
Issue Date
2018-01
Publisher
IRON STEEL INST JAPAN KEIDANREN KAIKAN
Citation
ISIJ INTERNATIONAL, v. 58, No. 1, Page. 88-97
Abstract
The effect of CaO/Al2O3 (=C/A) ratio of the ladle slag on the formation behavior of non-metallic inclusions in the Mn-V-alloyed steel was investigated using both the experimental method and refractory-slag metal-inclusion (ReSMI) multiphase reactions simulation. The formation behavior of inclusion was strongly affected by the activity of MgO in the initial slag at the early stage of the reaction. However, since the MgO activity converged to unity due to MgO dissolution from refractory to slag during the reaction, the formation behavior of inclusion was affected by the activity of CaO and Al2O3 in the slag rather than that of MgO at the final stage of the reaction. From the experimental results and ReSMI multiphase reaction model, the formation behavior of inclusions could be divided into three cases according to the C/A ratio of the slag as follows; 1) C/A < 1.5; Alumina -> Spinel -> Spinel + Liquid oxide, 2) 1.5 < C/A < 2.5; Alumina -> Spinel -> Liquid oxide, 3) C/A > 3.0; Alumina -> Spinel -> Liquid oxide Magnesia. Therefore, it was concluded that the C/A ratio of the ladle slag should be controlled from about 1.5 to 2.5 in order to suppress the harmful solid inclusions such as spinel during secondary refining processes.
URI
https://www.jstage.jst.go.jp/article/isijinternational/58/1/58_ISIJINT-2017-456/_article/-char/ja/https://repository.hanyang.ac.kr/handle/20.500.11754/105337
ISSN
0915-1559
DOI
10.2355/isijinternational.ISIJINT-2017-456
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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