The suitability of multispectral radiation thermometry (MRT) emissivity models for predicting steel surface temperature was reported. The test samples included a variety of steel such as stainless steel, hot-work tool steel, and cold-work tool steel. The spectral intensity values were first measured for steel alloys over the wavelength range of 2.91 to 4.13 μm and temperatures of 700, 800, and 900 K. A fast infrared array spectrometer was optically aligned in front of the test module to simultaneously measure 160 discrete spectral radiation intensity values from the examined wavelength range. The steel test sample was held in contact with a heating block, which was fabricated from brass and surrounded by a thick blanket of high-temperature ceramic fiber insulation. The results showed that the more than one-half of the temperature predictions by (MRT) models provide the absolute temperature error under ±50 K, and more than one-quarter of the results are under ±15 K.
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