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- Title
Investigation on Nonmetallic Inclusions in Ultra-Low-Oxygen Special Steels.
- Authors
Li, Jin; Jiang, Min; He, Xiao-Fei; Sun, Wei; Wang, Xin-Hua
- Abstract
Investigation was carried out on inclusions in ultra-low-oxygen special steel by taking systematic samplings not only from secondary refining but also from continuous casting. It was found that RH degassing had a much stronger ability than LF refining in removing inclusions. Total oxygen (TO) can be further reduced from 0.0013 to 0.0015 mass pct to about 0.00047 mass pct without too much difficulty by elongating RH degassing time to 33 minute. Inclusions larger than 5 μm were decreased from 1.49 to 0.08 N/mm with a removal ratio of about 94 pct. During secondary refining, inclusions experienced continuous evolution from AlO to the MgO-AlO, CaO-MgO-AlO, and CaO-AlO system due to complex reactions among slag, steel, and refractory materials. Because of more efficient removal of solid inclusions, especially those large ones during RH treatment, thorough modification of solid inclusions into liquid CaO-MgO-AlO can be achieved. Reoxidation during casting resulted in an obvious rise in AlO content in inclusions, which offset the efforts made during secondary refining. Liquid CaO-AlO systems after RH were changed to solid CaO-AlO, MgO-AlO, or CaO-MgO-AlO again. Large inclusions with sizes approaching several hundred micron were frequently observed in casting bloom by a vast area of scanning under an automatic scanning electron microscope despite very low TO of about 0.00059 mass pct. A total of 78 pct of them were cluster-shaped CaO-MgO-AlO solid inclusions with sizes as large as 200-330 μm. Most clusters over 100 μm were constituted by smaller particles with similar chemical compositions to other small singular inclusions in steel, which indicated that they were formed due to the aggregations of small inclusions during casting. Moreover, the location of them indicated a close relationship to the solidification microstructure of steel, which has not been covered before. It was impressively found that larger inclusions were mainly in the column grain zone area, while those in the central equiax grain zone of the bloom had smaller sizes.
- Subjects
NONMETALS; METAL inclusions; DEGASSING of metals; CONTINUOUS casting; SCANNING electron microscopes; METAL refining
- Publication
Metallurgical & Materials Transactions. Part B, 2016, Vol 47, Issue 4, p2386
- ISSN
1073-5615
- Publication type
Article
- DOI
10.1007/s11663-016-0687-9