Studies on the high‑temperature thermal conductivity of silicon steel are relatively scarce, which restricts the development and optimization of its manufacturing processes. In this work, the thermal conductivities of a series of non‑oriented silicon steel, oriented silicon steel and low‑carbon steel grades with different silicon‑aluminum contents were comprehensively measured in the temperature range of 200℃ to 1400℃. The results show that when the temperature exceeds 1000℃, the thermal conductivity of silicon steel increases abnormally with the rise of temperature, being about 10W/(m·K) higher than that of low‑carbon steel at 1400℃. Taking advantage of the high thermal conductivity of silicon steel at elevated temperatures, the casting speed and exit temperature of continuous casting billets can be increased. Meanwhile, inhibitor control can be shifted to the continuous casting billet stage, which reduces the soaking temperature of hot rolling furnaces and greatly shortens the furnace residence time. Furthermore, this characteristic enables direct slab rolling and improves product performance. In addition, the high‑temperature thermal conductivity of silicon steel helps to increase the billet casting speed, realize high‑throughput matching of continuous casting, rough rolling, finish rolling and cooling processes, eliminate intermittent downtime, ensure stable product quality and achieve remarkable energy‑saving effects.