Reasonable corner design of the mould is conducive to the uniform heat transfer of the billet, especially for the crack-sensitive steel such as Q235 under high casting speed. Based on the Ansys finite element analysis platform, three kinds of mould corner configurations were designed in this study, and the temperature and stress distribution of the billet and mould corresponding to different mould were compared and analysed. The results show that the cooling uniformity of the C-type mould (petal-type) was better than that of other corner configurations, the maximum temperature at the mould corner was reduced by 43.66 °C, the minimum temperature at the billet corner was increased by 109.73 °C, and the maximum Von-Mises equivalent stress at the corner of the billet was reduced by 28.09 MPa. Therefore, the C-type mould can further improve the quality of the billet and is conducive to the improvement of production efficiency.
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