This study is concerned with the manufacture and mechanical properties of large cast steel roll with new compositions (0.5C-1.25Cr-1.0Ni-0.5Mo-0.4V) which have been developed for prevention of roll breakage in service. The optimum heat treatment has been established to obtain high strength and good tough-ness. Four large cast steel rolls, two rolls for slabbing mill and two rolls for break down mill, have been manufactured by applying the results of the experiments. Mechanical properties of the rolls are superior to those of conventional cast steel rolls in characters of strength and toughness at both normal and elevated temperatures.
At present, about one hundred rolls made of the new material are under service and for a slabbing mill they show excellent rolling performance irrespective of very severe rolling condition.
