The characteristic of the SG iron roll is that the graphite is evenly distributed from the roll body to the core, so it has high tensile strength, can withstand heavy loads, and has good wear resistance. The matrix structure is carbide, pearlite or acicular bainite. Alloy ductile iron rolls can be roughly divided into pearlitic ductile iron rolls and bainitic ductile iron rolls according to the matrix structure of the roll body. Alloy ductile iron rolls have good thermal shock resistance and wear resistance, and are widely used as rolls for large blooming mills, section steel mills, continuous bar mills and large seamless tube mills.