Paper Titles
Effects of Hydrogen on the Corrosion Resistance of Metallic Materials and Semiconductors
p.139
Beneficial Effect of Impurity Sulfur on High-Temperature Steam Oxidation of High Chromium Ferritic Steels
p.147
The Effect of Gas Flow Rate on the Oxide Scale Morphology of a 10%Cr-Ferritic Steels in Ar-H2O and Ar-H2-H2O Mixtures
p.155
TDS Measurement of Hydrogen Released from Stainless Steel Oxidized in H2O-Containing Atmospheres
p.163
Effect of Chromium Content on the Oxidation Behaviour of High-Speed Steels under Dry and Moist Air Environments
p.171
Steam Oxidation of TP 347H FG in Power Plants
p.181
Hot Corrosion and Steam Oxidation Properties of New Heat Resistant Steels for Ultra Super Critical Boilers
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The Relationship between High-Temperature Steam Oxidation and Hydrogen Dissolution in High-Chromium Ferritic Steels
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Steam Oxidation Testing of Coatings for Next Generation Steam Power Plant Components
p.205

Effect of Chromium Content on the Oxidation Behaviour of High-Speed Steels under Dry and Moist Air Environments

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Abstract:

Development and use of high-speed steels for manufacturing the roll outer shell of hot strip mills represented a major recent technological advancement in the hot rolling field. However, it was observed that the oxidation behavior of these steels was different from that of conventional rolls. The high-speed steel oxidation rate is about four times higher than the alloys previously used. Furthermore, the rolling conditions are quite aggressive. Contact of the roll with the hot strip, air and water of the cooling system is expected to increase the oxidation of the roll surface in this wet atmosphere. Therefore, it is necessary to study their oxidation behavior in order to achieve the full potential of high-speed steel rolls for hot strip mills. In the present work, the oxidation behavior of three high-speed steels with differences in chromium content was studied. Corrosion tests were carried out in a thermobalance under dry and moist (12.5 % H2O) atmospheres at 765oC for 240 minutes. The corroded samples were examined by X-ray diffraction, scanning electron microscopy and energy dispersive micro-analysis. It was found that the variation of chromium content of the high-speed steels studied was sufficient to influence the oxidation behaviour. Samples with high chromium contents presented smallest final mass gain. The presence of humidity had a significant effect on the oxidation behavior.

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Periodical:

Materials Science Forum (Volumes 522-523)

Pages:

171-180

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.522-523.171

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Online since:

August 2006

Authors:

Mauricio J. Monteiro, F.C. Rizzo

Keywords:

Dry Environment, High Speed Steel, Moist Environments, Oxidation, Thermobalance

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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