High temperature corrosion of steels used in petroleum refinery heaters

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2005

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Sultan, Abdelrahman

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The oxidation of three different steels used in the construction of petroleum refineryheaters was investigated by using thermogravimetric analysis technique (TGA). C-5,P-11, and P-22 steel samples were tested in two different oxidizing environments; air and CO2+N2+H2O (that simulates the combustion products of natural gas) at two different temperatures; 450oC and 500oC. In air oxidation P-22 had the best oxidation resistance among the three steels at two temperatures. In CO2+N2+H2O environment,C-5 possessed better oxidation resistance than P-22 and P-11. Analyses of oxidation products by using optical microscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were carried out to correlate TGA results to oxide composition and morphology. Lower oxidation rate of P-22 in air was explained with reference to the formation of Cr-O phase. Analytical rate equations showed that all the steels obeyed parabolic rate equation during oxidation and no transition was observed

Subject Keywords

Metallurgy.

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http://etd.lib.metu.edu.tr/upload/12606204/index.pdf
https://hdl.handle.net/11511/15229

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

A. Sultan, “High temperature corrosion of steels used in petroleum refinery heaters,” M.S. - Master of Science, Middle East Technical University, 2005.