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Effect of polishing treatment and thermal oxidation on the total hemispherical thermal emittance of austenitic stainless steel AISI 321

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  • Sharma, V.C.

Abstract

The optimum value of the hemispherical thermal emittance (ϵh) of austenitic stainless steel (SS) AISI 321, polished with “AB Polishing Alumina” of particle sizes 0.05, 0.3, and 5.0 μm and abrasives of various grit sizes, is found to be 0.13 ± 0.01 and is significantly lower than the corresponding value of 0.23 ± 0.01 for the unpolished samples. Although the ϵh value at a given firing temperature is constant, a small but systematic upward trend exists when the temperature is raised from 823 to 1293 K. At a firing temperature of 1293 K and for firing times of 3 to 15 min, ϵh increases from 0.15 to 0.22 ± 0.01.

Suggested Citation

  • Sharma, V.C., 1982. "Effect of polishing treatment and thermal oxidation on the total hemispherical thermal emittance of austenitic stainless steel AISI 321," Energy, Elsevier, vol. 7(7), pages 607-610.
    • Handle: RePEc:eee:energy:v:7:y:1982:i:7:p:607-610
    DOI: 10.1016/0360-5442(82)90016-0
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