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11193 Oxidation Behavior of Super-Bainitic 3Cr Steel

Picture for 11193 Oxidation Behavior of Super-Bainitic 3Cr Steel
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Product Number: 51300-11193-SG
ISBN: 11193 2011 CP
Author: B. A. Pint and J. A. Haynes
Publication Date: 2011
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$20.00
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A new 3Cr-1.6W super-bainitic steel, Grade 315, was developed with superior creep properties, enabling use at higher temperature than current 1-2%Cr steels. However, with only 3%Cr, this material may experience corrosion problems when exposed at higher (600°-650°C) temperatures. The oxidation behavior of this new material was compared to other Fe-Cr alloys in steam, wet air, CO2-H2O and fireside corrosion. The oxidation performance of Gr.315 was consistent with its Cr content and with that of Fe-2.25Cr (Grade 22). In order to improve oxidation resistance in the presence of water vapor, thin aluminide coatings on Gr.315 and Gr.22 were evaluated at 550°-800°C. Early coating failures compared to similar coatings on 9Cr substrates suggested that the alloy Cr content has a significant effect on coating life as has been observed in model Fe-Al-Cr alloys and that different coating compositions need to be evaluated for this steel.

Keywords: bainitic steel, high temperature oxidation, steam, coating, CO2
A new 3Cr-1.6W super-bainitic steel, Grade 315, was developed with superior creep properties, enabling use at higher temperature than current 1-2%Cr steels. However, with only 3%Cr, this material may experience corrosion problems when exposed at higher (600°-650°C) temperatures. The oxidation behavior of this new material was compared to other Fe-Cr alloys in steam, wet air, CO2-H2O and fireside corrosion. The oxidation performance of Gr.315 was consistent with its Cr content and with that of Fe-2.25Cr (Grade 22). In order to improve oxidation resistance in the presence of water vapor, thin aluminide coatings on Gr.315 and Gr.22 were evaluated at 550°-800°C. Early coating failures compared to similar coatings on 9Cr substrates suggested that the alloy Cr content has a significant effect on coating life as has been observed in model Fe-Al-Cr alloys and that different coating compositions need to be evaluated for this steel.

Keywords: bainitic steel, high temperature oxidation, steam, coating, CO2
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