ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Forming Processing and Thermomechanical Treatment
Effect of MC Type Carbides on Wear Resistance of High Wear Resistant Cast Iron Rolls Developed for Work Rolls of Hot Strip Mills
Kazunori Kamimiyada Shinya IshikawaHirofumi MiyaharaYuji Konno
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2021 Volume 61 Issue 10 Pages 2597-2604

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Abstract

High-speed steel cast-iron rolls were developed around 1990 and have been widely used for the earlier stand of hot strip mills. However, for the later stand of hot strip mills, the use of high-speed steel cast-iron rolls has been limited due to the insufficient crack resistance. Therefore, in order to improve the wear resistance of the later stand, enhanced indefinite chilled rolls in which MC-type carbides of high hardness are crystallized in a conventional indefinite chilled roll has been developed. However, since the wear resistance of enhanced indefinite chilled rolls is significantly inferior to that of high-speed steel cast-iron roll, the development of a new cast iron roll with superior wear resistance applicable to the later stand of hot strip mills was studied. The present development roll has improved wear resistance by increased amount of the high hardness MC-type carbide-forming elements. In addition, the reduction of the carbon equivalent for less amount of eutectic carbide resulted in the reduction of the residual stress down to the same level as the indefinite chilled roll, which improved the crack resistance. As a result, it was confirmed that the wear resistance was improved about three times compared with the conventional indefinite chilled roll. In addition, the results suggest that the wear resistance of work rolls in hot strip mills is greatly controlled by the amounts of MC-type carbides, despite the roll hardness being the same.

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© 2021 The Iron and Steel Institute of Japan.

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