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Open AccessArticle

Impacts of Modification of Alloying Method on Inclusion Evolution in RH Refining of Silicon Steel

State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA
Author to whom correspondence should be addressed.
Materials 2017, 10(10), 1206;
Received: 28 September 2017 / Revised: 15 October 2017 / Accepted: 16 October 2017 / Published: 19 October 2017
PDF [4902 KB, uploaded 20 October 2017]


This study explores the effect of introducing additional alloy elements not only in a different order but also at different stages of the Ruhrstahl-Heraeus (RH) process of low-carbon silicon steel production. A more economical method, described as “pre-alloying”, has been introduced. The evolution of MnO-FeO inclusions produced by pre-alloying was investigated. Results show that spherical 3FeO·MnO inclusions form first, then shelled FeO·zMnO (z = 0.7–4) inclusions nucleate on the surface of pre-existing 3FeO·MnO. Spherical FeO·zMnO (z = 3–5) is further evolved from shelled 3FeO·MnO by diffusion. Because these MnO-FeO inclusions float up into the slag before degassing, the pre-alloying process does not affect the quality of the melt in the end. Both carbon content and inclusion size conform to industry standards. View Full-Text
Keywords: silicon steel; RH refining; inclusions; evolution silicon steel; RH refining; inclusions; evolution

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Li, F.; Li, H.; Zheng, S.; You, J.; Han, K.; Zhai, Q. Impacts of Modification of Alloying Method on Inclusion Evolution in RH Refining of Silicon Steel. Materials 2017, 10, 1206.

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