The Roll cassette of Scale breaker is a core component of the steel coil pre-treatment scale breaker system. Integrating a high-rigidity Work Roll assembly with precision bearings, it enables uniform cracking of steel coil surface oxide scale via precise roll gap pressure adjustment—creating optimal conditions for subsequent acid pickling to remove the oxide layer. Simultaneously, it works in tandem with the tension system to stretch-level the strip, correcting flatness defects. Some cassettes feature a sealed, waterproof design that isolates coolant contamination, extends bearing service life, and accommodates varying strip specifications. Ensuring continuous and stable line operation, the roll cassette serves as a critical unit for enhancing both strip surface quality and production efficiency.