Abstract
A pyrometric analysis of the temperature of continuous annealed strip material is an essential component of industrial production. However, despite calibration, the development of composition-dependent oxides during annealing prevents an accurate pyrometric measurement of actual strip temperature. An Al-based and a Si-based transformation induced plasticity (TRIP)-assisted steel were pyrometrically analyzed during annealing under a reducing atmosphere (5 pct H2 and 95 pct Ar). Oxide development on both steels led to a deviation between pyrometer readings and simultaneous thermocouple measurements. The developing oxides influenced the pyrometer readings to different extents because of unique emissivities and different growth kinetics.
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Notes
The literature source did not include ε(λ) for λ < 1.0 µm. However, a greater spread between the sampled wavelengths generally does not reduce the difference in emissivities.
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Acknowledgments
The authors would like to thank Mr. Norden (DOC) for the fruitful discussions. The authors would also like to express their gratitude to Mr. Paul for productive discussions and the ThermoCalc calculations.
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Manuscript submitted: September 23, 2009.
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Thiessen, R.G., Bocharova, E., Mattissen, D. et al. Temperature Measurement Deviation during Annealing of Multiphase Steels. Metall Mater Trans B 41, 857–863 (2010). https://doi.org/10.1007/s11663-010-9380-6
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DOI: https://doi.org/10.1007/s11663-010-9380-6