In order to study the characteristics of roll surface electromagnetic temperature control technology (RSETCT), numerical simulation models with longitudinal magnetic temperature controller (LMTC) and transverse magnetic temperature controller (TMTC) were constructed, respectively. The study compared the temperature control capabilities of the LMTC and TMTC, analyzed the impact of three types of polymagnetic structures on temperature control, and examined how different cooling positions and cooling structures affect the temperature field of the roll. The results show that under the same process parameters, the LMTC can make the roll surface reach a higher temperature, ∼650 °C. The TMTC can make the temperature uniformity of the roll surface better, with a maximum temperature difference of about 10 °C. Compared with semi-closed polymagnetic structure, the fully enclosed and separated polymagnetic structures have stronger temperature control ability for the TMTC. The groove and fin structures set in the stepped section of the roll can prevent the temperature of the roll surface from decreasing sharply and also reduce the temperature of the roll neck.
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