Commonly used roll materials include alloy forged steel, alloy cast steel and cast iron. Alloy forged steel is used for the alloy forged steel of the mill roll. The roll is an important part of the rolling mill in the rolling mill. The pressure generated by a pair or a group of rolls is used to roll the steel. It is mainly subjected to dynamic and static loads, wear and temperature changes during rolling. The materials of the work rolls in the commonly used cold rolls are 9Cr, 9Cr2, 9Crv, 8CrMoV, etc. The cold rolls require surface quenching, and the hardness is HS45~105. Commonly used materials for hot rolling rolls are 55Mn2, 55Cr, 60CrMnMo, 60SiMnMo, etc. Hot rolling rolls are used in the processing of billets, thick plates, and section steel. It withstands strong rolling force, severe wear and thermal fatigue, and hot rolls work at high temperatures, and allow diameter wear within a unit of workload, so surface hardness is not required, only high strength and toughness are required and heat resistance. The hot rolls are only integrally normalized or quenched, and the surface hardness is required to be HB190~270. Forged semi-steel and forged white iron are low-plastic materials with high wear resistance, and can be used to manufacture high-quality rolls by improving their microstructure and increasing their strength and toughness through appropriate forging processes. Runxiang reminds you that roller for steel rolling mill are different from general structural parts, and the working conditions are complex and diverse. During the rolling process, the roll body is subject to high stress, mainly bending stress and friction, etc., and the main drive roll also bears huge torque. The surface of the roller body has to withstand friction, wear, impact, contact stress and fatigue caused by intense cooling and heat for a long time. Therefore, in addition to the conventional mechanical properties, various rolling mills put forward a series of special requirements for the performance of the rolls, which are different from other products.