Temperature control in heat treating is of paramount importance in maintaining the quality and achieving the desired metallurgical results. This article provides a detailed account of the factors affecting temperature control in heat treating furnaces, with information on temperature control systems, including contact sensors, noncontact sensors, controllers, energy-flow regulators, measurement instruments, and set-point programmers. Common contact sensors include temperature scales, thermocouples, and resistance temperature detectors, whereas optical pyrometers and on-line radiation thermometers fall under the noncontact type. The article describes two types of instrumentation used in heat treating: field test instruments for temperature-uniformity surveys and system-accuracy tests; and controlling, monitoring, and recording instruments for digital instrumentation.
Peter Sherwin, Temperature Control in Heat Treating, Steel Heat Treating Technologies, Vol 4B, ASM Handbook, Edited By Jon L. Dossett, George E. Totten, ASM International, 2014, p 152–169, https://doi.org/10.31399/asm.hb.v04b.a0005925
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