What is a roll: A roll is a tool that uses the pressure generated by a pair or a set of rolls to roll steel and cause plastic deformation of the metal. The rolls are mainly subjected to dynamic and static loads, wear and temperature changes during rolling. Commonly used heat treatment types for rolls include stress relief annealing, isothermal spheroidizing annealing, diffusion annealing, normalizing, tempering, quenching, and cryogenic treatment.

Roll features and uses: chilled cast iron rolls have good wear resistance and smooth surface, which are used for finishing rolls with small loads. The infinite chilled cast iron roll has the characteristics of wear resistance, thermal crack resistance and moderate strength. It is used for various hot-rolled strip steel work rolls, small and wire rolls. Ball-milled cast iron rolls have high strength and toughness, and have better thermal crack resistance and wear resistance than steel rolls. They are used for all kinds of profile steel rolls, hot plate steel work rolls with heavier loads, smoothing rolls, and backing rolls.

Types of rolls: According to the process method, it is divided into integral rolls, metallurgical composite rolls and combined rolls; according to the forming method, it can be divided into casting rolls and forging rolls. The outer layer and core of the roll body and the roll neck of the integral roll are cast or forged from a single material. The cast roll refers to the type of roll manufactured by the production method of direct casting of molten steel or molten iron.