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Open access article. Characterization of oxide scales on the inner side on tubes made of two steels with different chromium content, after two different prolonged periods of service, were compared and also their influence on the service life of tubes and kinetics of oxide scale growth were analyzed.

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Process of oxidation is followed by process of internal oxidation of steel as a consequence of oxygen diffusion trough oxide layers, which rate depend on: defect density. Grain boundaries and Cr depletion zones due to the aging process of metal exposed to creep are preferable locations for a higher rate of internal oxidation process.This process is less intensive in 2.25Cr steel due to the higher rate of general oxidation.


In this paper some data are presented about oxidation behavior of boiler tubes sections made of 2.25Cr1Mo and 12Cr1Mo0.3V steel after service life of approximately 130.000 and 200.000 hours in two 620MW TPP units. Particularly exposed to the most severe operating conditions are final SH that provide fresh steam of the highest parameters, but oxidation process take place in all SH surfaces exposed to high enough temperature.

Professor Milos B. Djukic
University of Belgrade, Faculty of Mechanical Engineering

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This page is a summary of: Oxidation behavior during prolonged service of boiler tubes made of 2.25Cr1Mo and 12Cr1Mo0.3V heat resistance steels, Procedia Structural Integrity, January 2016, Elsevier,
DOI: 10.1016/j.prostr.2016.06.453.
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