Improvement in Cleanliness & Core Loss of Electrical Steels by Optimizing RH Refining Process Improvement in Cleanliness & Core Loss of Electrical Steels by Optimizing RH Refining Process

by Chi-Cheng Lin, Yung-Chang Liu, Yu-Ping Sui, Cheng-Hua Yuan, Chia-Hao Kuo, Jung-Chung Feng Chi-Cheng Lin, Yung-Chang Liu, Yu-Ping Sui, Cheng-Hua Yuan, Chia-Hao Kuo, Jung-Chung Feng

Publisher - China Steel Corporation, Kaohsiung, Taiwan China Steel Corporation, Kaohsiung, Taiwan

Category - General Novel

In order to decrease the core loss of 50CS1300, efforts were made to control the formation of inclusions in the RH refining process to improve the cleanliness of steels in this study. Pre-deoxidation by aluminum was usually carried out prior to the addition of ferrosilicon during RH treatment of 50CS1300, but the residual free oxygen (i.e., f[O]) was not monitored after that. Therefore, the effects of the extent of pre-deoxidation on the cleanliness and the core loss of steels were still unclear. By analyzing the steel cleanliness, it was observed that inclusions in high core loss steel coils are more and larger than those in low ones. Furthermore, inclusions broken into small pieces with a long chain during rolling were also found in these samples. The cleanliness of these steel coils was apparently worse. Besides, both of them wereSiO2-Al2O3-MnO-TiO2 composite oxides, but the former had a higher SiO2 percentage. It could be considered that the high core loss was due to the poor cleanliness of the steels. Insufficient pre-deoxidation would lead to poor cleanliness and high core loss. Accordingly, after improving cleanliness by controlling f[O] prior to addition of ferrosilicon during RH treatment, the core loss was decreased successfully. In order to decrease the core loss of 50CS1300, efforts were made to control the formation of inclusions in the RH refining process to improve the cleanliness of steels in this study. Pre-deoxidation by aluminum was usually carried out prior to the addition of ferrosilicon during RH treatment of 50CS1300, but the residual free oxygen (i.e., f[O]) was not monitored after that. Therefore, the effects of the extent of pre-deoxidation on the cleanliness and the core loss of steels were still unclear. By analyzing the steel cleanliness, it was observed that inclusions in high core loss steel coils are more and larger than those in low ones. Furthermore, inclusions broken into small pieces with a long chain during rolling were also found in these samples. The cleanliness of these steel coils was apparently worse. Besides, both of them wereSiO2-Al2O3-MnO-TiO2 composite oxides, but the former had a higher SiO2 percentage. It could be considered that the high core loss was due to the poor cleanliness of the steels. Insufficient pre-deoxidation would lead to poor cleanliness and high core loss. Accordingly, after improving cleanliness by controlling f[O] prior to addition of ferrosilicon during RH treatment, the core loss was decreased successfully.

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