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PRODUCTS NAME: HOT ROLLING STEEL BALLS MATERIAL: B2 STEEL SIZE: DIA 25-150MM CHEMICAL ELEMENTS: SPECS Chemical composition 60Mn Steel C:0.72-0.92,Mn:0.7-1.0 S:0.035Max,P:0.035Max Si:0.2-0.4,Cr:0.4-0.6 ...