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Influence of surface treatments on the total normal emittance of AISI316 stainless steel

Einfluß der Oberflächenbehandlung auf den normalen Gesamtemissionsgrad von rostfreiem Stahl AISI 316

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Abstract

Total normal emittance measurements have been performed on AISI 316 L samples in temperature range 400–1050 K. Two sets of mirror finished samples, with the same average roughness, have been obtained by means of polishing wheels and metallographical procedure and then etched with different acid mixtures.

Emittance tests were carried out on all samples oxidized at 1050 K for a period of 3 and 14 hours.

Experimental results show a remarkable influence of surface finishing on the total normal emittance of oxidized samples. The influence of surface finishing becomes negligible when an electropolishing process is made after etching.

Zusammenfassung

Der normale Gesamtemissionsgrad an Proben von AISI 316 L wurde für Temperaturen von 400 bis 1060 K gemessen. Zwei Sätze von spiegelblanken Proben mit gleicher Rauhigkeit wurden mit Hilfe von Polierscheiben oder durch eine metallographische Prozedur vorbehandelt und dann mit verschiedenen Säuremischungen geätzt. An allen oxidierten Proben wurde der Emissionsgrad bei 1050 K über 3 und 14 Stunden gemessen. Die Versuche zeigen einen starken Einfluß der Oberflächenbehandlung auf den Emissionsgrad der oxidierten Proben, der jedoch zu vernachlässigen war, wenn die Proben nach dem Ätzen elektropoliert wurden.

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Authors and Affiliations

  1. Istituto di Fisica Tecnica e Impianti Termotecnici, Via all' Opera Pia, 15/a I-16145, Genova, Italy

    C. Isetti &  E. Nannei

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  1. C. Isetti
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  2. E. Nannei
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Research sponsored by C.N.R.-Consiglio Nazionale delle Ricerche, Roma, Italy

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Isetti, C., Nannei, E. Influence of surface treatments on the total normal emittance of AISI316 stainless steel. Wärme- und Stoffübertragung 14, 211–215 (1980). https://doi.org/10.1007/BF01637703

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  • DOI: https://doi.org/10.1007/BF01637703

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