high quality cast iron balls 1 good and High Quality Control 2,Prompt Delivery 3,Competitive Prices 4,SAE, ISO9001:2008 Type and Chemical composition of cast iron ballsNameCMnSiCrSPMoAlMicrostructureSpeical Hi-Cr I2.0-2.80.5-2.01.0max22-320.06max0.08maxmicomicoM+CSpeical Hi-Cr II2.0-2.80.5-2.01.0max17-220.06max0.08maxmicomicoM+CSpeical Hi-Cr III2.2-3.00.5-2.01.0max15-170.06max0.08maxmicomicoM+ ...