Failure Analysis of Radiant Tube Burners in Continuous Annealing Line (CAL) of an Integrated Steel Plant

Journal of Failure Analysis and Prevention 06/2011; 11(3):286-292. DOI: 10.1007/s11668-010-9426-8


Failure analysis of radiant tube burners (ACI HK 40 with composition ~25wt.% Cr, ~20wt.% Ni) removed from a continuous annealing
line (CAL) of a cold rolling mill (CRM) of an integrated steel plant was performed using optical microscopy (OM), scanning
electron microscopy (SEM), electron probe microanalysis (EPMA), and microhardness measurements. Studies revealed that the
failures were mainly attributed to combined influences of creep and carburization-assisted localized oxidative attack. A suitable
heat-resisting cast austenitic stainless steel was identified as a candidate alloy to replace the previously used ACI HK 40

KeywordsCast austenitic stainless steel–Radiant tube–CAL–CRM

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Available from: Dr Gadadhar Sahoo, Mar 26, 2014
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    ABSTRACT: Creep damage investigation was carried out in Fe-Ni-Cr alloy at 800°C, 900°C, and 983°C using rectangular section form of specimen. In all the tests conducted on this material, some creep curves showed primary stage, secondary stage and tertiary stage. The creep fracture shows ductile transgranular fracture where separation occurred at the dendrites carbide interface suggesting that the detrimental effect of creep was compounded by precipitation of carbides at matrix. The presence of cavities may be due to the difference in thermal expansion characteristics of the austenite and carbide during high temperature test. Coarsening of carbides lead to cavities formation within the dendrite and carbide interface and form cavities linkage due to formation of crack and finally cause creep fracture. Increase in creep temperature it will lead to increase in creep rate. The fracture modes of creep samples were investigated to predict the failure mode.
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