2022-06-17
The traditional material of F1 to F3 finishing rolls is cast semi-steel and high chromium cast iron. Since 1980s, the market share of HSS composite rolls applied on F1 to F3 stands is increasing. Its wear resistance and thermal cracking resistance are extremely superior, and effectively overcome the defects of roll surface spots, especially suitable for rolling stainless steel plate with high surface quality requirements. In recent years, high speed steel compound roll in F4 to F6 rack application also has a tendency to increase gradually, F7 stand still in use nickel-chromium molybdenum infinite chilled cast iron roll, in order to improve the nickel chromium molybdenum infinite chilled cast iron roll abrasion resistance and thermal crack resistance, by adding one strong carbide forming elements such as vanadium, niobium and refine the solidification organization, obtained the improved infinite chilled cast iron roll, The service life of roller can be increased by more than 20%. In steel rolling production, according to user requirements, part of hot rolled plates need to be leveled before delivery. For the four-roll machine, the support roller and the work roller used to choose centrifugal composite high ni-Cr infinitely chilled cast iron roll, in recent years, the use of high chromium cast iron roll, its wear resistance is 2 to 3 times higher than the high ni-cr infinitely chilled cast iron roll. However, for the two-roll flattener with roll bending function, its roll neck strength requirements are higher, can not use the casting roll, choose 5%Cr forged steel quenching material, the use effect is better.