... cast iron roller, centrifugal roller, normal steel casting roller, semi-steel roller, normal steel forging roller, hot rolled forging roller, ... , silica-gel roller.And here is the material (steel grade) of our machining parts: CrMo ductile cast iron indefinite chill ... , high NiCr centrifugal casting, ZU70Mn2, semi-steel, 60CrMnMo,9Cr2Mo, ...