TY - JOUR
T1 - Effect of MC type carbides on wear resistance of high wear resistant cast iron rolls developed for work rolls of hot strip mills
AU - Kamimiyada, Kazunori
AU - Ishikawa, Shinya
AU - Miyahara, Hirofumi
AU - Konno, Yuji
N1 - Publisher Copyright:
© 2020 Iron and Steel Institute of Japan. All rights reserved.
PY - 2020
Y1 - 2020
N2 - High-speed steel type cast iron rolls were developed around 1990 and have been widely used in the former stands of hot strip mills. However, in the latter stands of the hot strip mills, the use of high-speed steel type rolls has been limited due to the insufficient crack resistance. Therefore, in order to improve the wear resistance of the latter stands, enhanced type high-nickel grain rolls in which MC type carbides of high hardness are crystallized in a conventional high-nickel grain roll has been developed. However, since the wear resistance of the enhanced type high-nickel grain roll is significantly inferior to that of the high-speed steel type roll. Therefore, The development of a new cast iron roll with superior wear resistance and is applicable to the latter stands of hot strip mills was studied. The present development roll has improved wear resistance by increasing the amount of addition of the high hardness MC type carbide forming elements. In addition, the reduction of the carbon equivalent for less amount of eutectic carbides resulted in the reduction of the residual stress down to the same level as the high-nickel grain 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 high-nickel grain rolls. In addition, the results suggest that the wear resistance of work rolls for the hot strip mill is largely controlled by the amount of MC carbides among the rolls with the same hardness.
AB - High-speed steel type cast iron rolls were developed around 1990 and have been widely used in the former stands of hot strip mills. However, in the latter stands of the hot strip mills, the use of high-speed steel type rolls has been limited due to the insufficient crack resistance. Therefore, in order to improve the wear resistance of the latter stands, enhanced type high-nickel grain rolls in which MC type carbides of high hardness are crystallized in a conventional high-nickel grain roll has been developed. However, since the wear resistance of the enhanced type high-nickel grain roll is significantly inferior to that of the high-speed steel type roll. Therefore, The development of a new cast iron roll with superior wear resistance and is applicable to the latter stands of hot strip mills was studied. The present development roll has improved wear resistance by increasing the amount of addition of the high hardness MC type carbide forming elements. In addition, the reduction of the carbon equivalent for less amount of eutectic carbides resulted in the reduction of the residual stress down to the same level as the high-nickel grain 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 high-nickel grain rolls. In addition, the results suggest that the wear resistance of work rolls for the hot strip mill is largely controlled by the amount of MC carbides among the rolls with the same hardness.
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U2 - 10.2355/TETSUTOHAGANE.TETSU-2020-003
DO - 10.2355/TETSUTOHAGANE.TETSU-2020-003
M3 - Article
AN - SCOPUS:85098051245
VL - 106
SP - 883
EP - 891
JO - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
JF - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
SN - 0021-1575
IS - 12
ER -