ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Development and use of high-speed steels for manufacturing the roll outer shell of hotstrip 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 conventionalrolls. 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, airand water of the cooling system is expected to increase the oxidation of the roll surface in this wetatmosphere. Therefore, it is necessary to study their oxidation behavior in order to achieve the fullpotential of high-speed steel rolls for hot strip mills. In the present work, the oxidation behavior ofthree high-speed steels with differences in chromium content was studied. Corrosion tests werecarried out in a thermobalance under dry and moist (12.5 % H2O) atmospheres at 765oC for 240minutes. The corroded samples were examined by X-ray diffraction, scanning electron microscopyand energy dispersive micro-analysis. It was found that the variation of chromium content of thehigh-speed steels studied was sufficient to influence the oxidation behaviour. Samples with highchromium contents presented smallest final mass gain. The presence of humidity had a significanteffect on the oxidation behavior
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.522-523.171.pdf
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