Solubility of sulfur in the solid oxides of CaO-Al 2 O 3 system

Xu Gao, Yosuke Baba, Masashi Nishimoto, Shigeru Ueda, Kitamura Shinya

研究成果: Conference contribution

抄録

It is a well-known that CaS precipitates on the CaO-Al 2 O 3 inclusion and deteriorate the corrosion resistance property of steel. To prevent the formation of CaS, the sulfide capacity of molten CaO-Al2O3 oxide, and the distribution of S between these molten oxides and molten steel have been studied. However, in some cases, CaS forms after the solidification of steel and oxides during heat treatment. To clarify the formation mechanism of CaS on the oxides at solid state, the solubility of S in the solid compounds of CaO-Al 2 O 3 system, and the S distribution behavior among these compounds and solid steel are important. In this study, CaO-Al 2 O 3 -CaS oxides with various compositions were melted at 1873 K under CO-CO 2 -SO 2 atmosphere, and then cooled and kept at a temperature range of 1373 K -1473 K followed by quenching. Afterwards, the formed solid compounds and the S content in each compound of the quenched oxide were observed by EPMA. The results showed that, irrespective of the holding temperature, the S content of solid C1 2 A 7 (C stands for CaO and A for Al 2 O 3 ) varied much and the highest values was approximately 1 mass% and was close to the S solubility of the liquid CaO-Al 2 O 3 system of the same composition at 1773K. The S contents in other solid compounds, which were CA 2 , CA, or C 3 A, were low. This result indicated that the S is soluble only in C1 2 A 7 in the solid state, and the precipitation of CaS from CaO-Al 2 O 3 oxide could be prevented by controlling the oxide composition.

本文言語English
ホスト出版物のタイトルICS 2018 - 7th International Congress on Science and Technology of Steelmaking
ホスト出版物のサブタイトルThe Challenge of Industry 4.0
出版社Associazione Italiana di Metallurgia
ISBN(電子版)9788898990146
出版ステータスPublished - 2018 1 1
イベント7th International Congress on Science and Technology of Steelmaking, ICS 2018 - Venice, Italy
継続期間: 2018 6 132018 6 15

出版物シリーズ

名前ICS 2018 - 7th International Congress on Science and Technology of Steelmaking: The Challenge of Industry 4.0

Conference

Conference7th International Congress on Science and Technology of Steelmaking, ICS 2018
国/地域Italy
CityVenice
Period18/6/1318/6/15

ASJC Scopus subject areas

  • 金属および合金

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