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.

高速钢铸铁轧辊是在1990年左右开发出来的，在早期的带钢热轧机机架上得到了广泛的应用。但是，对于热轧机的后期机架，由于抗裂性不足，限制了高速钢铸铁轧辊的使用。因此，为了提高后机架的耐磨性，开发了在传统的无限冷轧辊中结晶高硬度MC型碳化物的增强型无限冷硬轧辊。然而，由于增强型冷硬轧辊的耐磨性明显不如高速钢铸铁轧辊，因此研究了一种适用于热轧机后机架的耐磨性能优良的新型铸铁轧辊的研制。本显影辊通过增加高硬度MC型碳化物形成元素的量而提高了耐磨性。此外，较少量的共晶碳化物的碳当量降低导致残余应力降低到与无限冷轧辊相同的水平，从而提高了抗裂性。结果证实，与传统的无限冷轧辊相比，耐磨性提高了约三倍。此外，结果表明，尽管轧辊硬度相同，但热轧带钢轧机工作辊的耐磨性很大程度上受 MC 型碳化物量的控制。对于较少量的共晶碳化物，碳当量的降低导致残余应力降低到与无限冷轧辊相同的水平，从而提高了抗裂性。结果证实，与传统的无限冷轧辊相比，耐磨性提高了约三倍。此外，结果表明，尽管轧辊硬度相同，但热轧带钢轧机工作辊的耐磨性很大程度上受 MC 型碳化物量的控制。对于较少量的共晶碳化物，碳当量的降低导致残余应力降低到与无限冷轧辊相同的水平，从而提高了抗裂性。结果证实，与传统的无限冷轧辊相比，耐磨性提高了约三倍。此外，结果表明，尽管轧辊硬度相同，但热轧带钢轧机工作辊的耐磨性很大程度上受 MC 型碳化物量的控制。