... rollers, we can do different rollers for plain cast iron roller, centrifugal roller, normal steel casting roller, semi-steel roller, normal steel 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, and any other material.The products machined ...