(a) Comparison chart of temperature reduction effect of 1.16-mm cordierite-covered steel sheet and pure steel sheet using Set B. (b) Comparison chart of temperature reduction effect of 2.22-mm cordierite-covered steel sheet and pure steel sheet using Set B. (c) Comparison chart of temperature reduction effect of 5.24-mm cordierite-covered steel sheet and pure steel sheet using Set B. (d) Maximum heating temperature of bare steel sheet and cordierite-covered steel sheet of different thicknesses.