... rolling mill: High precision , and high quality mechanical component rolls for steel rolling millJiangsu Giant Ally Imp. & Exp. Co., Ltd.is ... with the world top 500 enterprises: Bombardier, Danieli, Siemens etc.Specification:Material: Nodular ferritic cast iron, Nodular pearlitic cast iron, ... ISO90012000, ISO14000Range of diameter : 50MM-5000MMSurface accuracy: 0.001 rolls for steel rolling mill