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Microstructure inheritance of continuous casting steel deformed by hot-core heavy reduction rolling technology during reheating process |
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Abstract The Hot-core heavy reduction rolling (HHR2) technology can break the coarse casting microstructure and affect the microstructure and properties of the final product by affecting the morphology of austenite after reheating, as well as improving the internal shrinkage and porosity of the continuous casting steel. Two typical steels, such as microalloyed steel and medium carbon steel were selected as the research objects. The effects of HHR2 technology on the microstructure of continuous casting steel and the austenitic morphology after reheating were studied by the integrated pilot experiment of steelmaking, continuous casting and rolling in this paper. The results show that the casting microstructure can be improved and fine microstructure can be obtained at room temperature by HHR2 technology. For medium carbon steel, the fine microstructure obtained by HHR2 technology cannot keep fine after reheating, and the austenite grain size after reheating is larger than that of the non-deformed casting steel. However, for microalloyed steel, the fine microstructure obtained by HHR2 technology can be maintained after reheating due to the nailing effect of the second phase particles.
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Received: 02 March 2020
Published: 16 October 2020
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