Title

IMPROVEMENT IN HSS ROLLS FOR EARLY STANDS OF HOT STRIP MILLS

IMPROVEMENT IN HSS ROLLS FOR EARLY STANDS OF HOT STRIP MILLS

Authorship

Ernst, Roger; Breyer, Jean-Pierre; Tchoufang, Jérôme Tchuindjang; Lecomte-Beckers, Jacqueline

Ernst, Roger

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Breyer, Jean-Pierre

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Tchoufang, Jérôme Tchuindjang

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Lecomte-Beckers, Jacqueline

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DOI

10.5151/2594-5297-0076

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Abstract

Aurora and Kosmos grades are HSS alloys belonging to the complex Fe-Cr-C-X system, where X is a strong carbide former element of the V, Mo or W type. Both alloys were metallurgically characterised prior to their comparison. Metallurgical analyses involved phases identification and carbides quantification by using Scanning Electron Microscopy and Energy Dispersive X rays. Differential Thermal Analysis was performed to allow a better understanding of the solidification sequence of studied alloys while mechanical tests performed were compressive at room temperature and bulk hardness at usual service temperatures. An attempt was made in order to connect experimental results to the good behaviour in operation of Aurora grade. In fact Aurora grade appeared to exhibit strong metallurgical differences when compared to Kosmos grade, especially as concern in nature and amount of carbides.

Aurora and Kosmos grades are HSS alloys belonging to the complex Fe-Cr-C-X system, where X is a strong carbide former element of the V, Mo or W type. Both alloys were metallurgically characterised prior to their comparison. Metallurgical analyses involved phases identification and carbides quantification by using Scanning Electron Microscopy and Energy Dispersive X rays. Differential Thermal Analysis was performed to allow a better understanding of the solidification sequence of studied alloys while mechanical tests performed were compressive at room temperature and bulk hardness at usual service temperatures. An attempt was made in order to connect experimental results to the good behaviour in operation of Aurora grade. In fact Aurora grade appeared to exhibit strong metallurgical differences when compared to Kosmos grade, especially as concern in nature and amount of carbides.

Keywords

HSS; Carbides; DTA; Residual and intrinsic delta ferrite; Compression tests; Hot hardness

HSS; Carbides; DTA; Residual and intrinsic delta ferrite; Compression tests; Hot hardness