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| Research and improvement of technology to reduce Ti content in super-high grade non-oriented electrical steel |
| XUE Li-qiang1, PAN Zhen-dong2, Lü Ling-tao1, ZHANG Hai-tao1, ZHANG Xia1, WANG Jian-chang2 |
1. No.2 Steel-making Plant, Shanxi Taigang Stainless Steel Co., Ltd., Taiyuan 030030, Shanxi, China;
2. Technology Centre, Shanxi Taigang Stainless Steel Co., Ltd., Taiyuan 030030, Shanxi, China |
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Abstract By researching the source and changing rule of the solution [Ti] in super-high grade non-oriented electrical steel 35W230 during the smelting process, the key factors for the increase of solution [Ti] in steel were found, that the [Ti] came from the reduction of (TiO2) in the slag and Ti element in ferrosilicon alloy will get into the steel. At the same time, the key influences of the content of (TiO2) in the slag were also found, which were the [Ti] in molten iron and the amount of bauxite added to the converter. By using lower [Ti] molten iron with the w([Ti]) was 0.02% and reducing the adding amount of bauxite to 300 kg, compared with the situation of using the molten iron with the w([Ti]) was 0.04% and adding bauxite by an amount of 600 kg, the w([Ti])of the final product was reduced from 0.004 43% to 0.002 58%. Continuously, the deoxidizing measure in RH was further improved. First, when decarburization, Al was added to reduce w([O])to about 0.02%-0.03%. Then ferrosilicon alloy was added intend of deoxidizing and alloying. In this step, the [Ti] brought into the steel by ferrosilicon was reduced by the [O] in the steel. At last, Al balls and electrolytic manganese were added to the steel. Finally, the w([Ti])in the steel was reduced to 0.002 10%. The total oxygen mass fraction of slab in the experiment was 0.001 1%, which was similar to that of the normal production of 0.001 0%. By reducing the [Ti] of the steel, the iron loss P15/50 of the final product was reduced by about 0.07 W/kg. The magnetic induction J5000 was improved by about 0.004 T.
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Received: 21 February 2020
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2020, Vol. 30 
