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| Control practices for edge cracking after rolling of 300 mm thick wide-section plain plates |
| CAO Longqiong1, XIA Jinkui2, JIN Haibing2, YAN Min2, WANG Zixian3, ZHANG Liqiang3 |
1. Manufacturing Management Department of Yicheng Iron and Steel Co., Ltd., Baowu Group, Ezhou 436002, Hubei,China;
2. Steelmaking Plant, Baowu Group Yicheng Steel Co., Ltd., Ezhou 436002, Hubei,China;
3. School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243000, Anhui,China |
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Abstract Egang Steel's slab casting equipment has been in operation for over ten years. However, since the second half of 2020, discontinuous cracks deviating from the edge by 50-100 mm have been observed in 300 mm thick slabs. The cracking ratio of the rolled steel plates with a thickness of 300 mm reached 19.8%, resulting in a significant amount of slabs that could not be delivered as hot-rolled plates after edge cutting. Upon identifying the crucial factors through multiple rounds of testing and analysis, it was found that the increase in speed, steel composition, and nitrogen content had a certain impact on the formation of steel plate cracks. By modifying the process parameters, adjusting the molten steel composition, and controlling the nitrogen content, the deviating edge cracks on the 300 mm thick hot-rolled plates were essentially eliminated, and the edge crack rate was controlled to below 2%.
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Received: 26 August 2023
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2024, Vol. 43 
