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| Control and application on R-angle longitudinal crack of microalloyed near-net-shape bream blank |
| GONG Bin |
| Steel Making Plant of Laiwu Branch, Shandong Iron and Steel Co., Ltd., Laiwu 271104, Shandong,China |
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Abstract In the production process of microalloyed near-net-shape bream blank, longitudinal crack defects are very easy to occur near the R angle of bream blank, which seriously restricts the further improvement of slab qualification rate. In this paper, through the analysis of section characteristics and steel grade characteristics, the pouring effect of ladle and intermediate protection is improved. At the same time, the cooling system is redesigned, the physical and chemical properties of protective slag are optimized, the problem of R-angle longitudinal crack of microalloyed near-net-shape bream blank is effectively solved, and the generation of R-angle crack of microalloyed bream blank is also clarified, It is not the result of a single factor. It is necessary to put forward targeted solutions in combination with the actual steel grade and section characteristics.
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Received: 10 September 2021
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2022, Vol. 41 
