Failure analysis in the tube of the refrigeration system of a reheating furnace

Failure analysis in the tube of the refrigeration system of a reheating furnace

•Failure analysis of cooling system tube.•Microstructural changes due to loss of the refractory.•Structural steel tube corrosion due to microstructural changes. This work aimed to analyze a failure that occurred prematurely in an ASTM SS Grade 70 steel tube in the cooling system of a reheating furna...

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Bibliographic Details
Published in:Engineering failure analysis Vol. 120; p. 105052
Main Authors: Ávila, E.M.C., Dornellas, M.P., Correa, S.R., Pimenta, A.R., Diniz, M.G.
Format: Journal Article
Language:English
Published: Elsevier Ltd 01-02-2021
Subjects:
Ceramic coating
Corrosion
Microstructural changes
Structural steel tube
Ceramic coating
Corrosion
Microstructural changes
Structural steel tube
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Summary:•Failure analysis of cooling system tube.•Microstructural changes due to loss of the refractory.•Structural steel tube corrosion due to microstructural changes. This work aimed to analyze a failure that occurred prematurely in an ASTM SS Grade 70 steel tube in the cooling system of a reheating furnace. The following techniques were used: visual inspection, optical microscopy (OM), scanning electron microscopy (SEM), chemical analysis by energy dispersive spectroscopy (EDS), Vickers microhardness (HV) and measurements and chemical analysis by optical emission spectrometry (OES). It was concluded that the failure was caused by a drastic corrosion process, due to microstructural changes resulting from the loss of the refractory coating.
ISSN:1350-6307
1873-1961
DOI:10.1016/j.engfailanal.2020.105052