Materialï¼?steel Hardnessï¼?HRC55-65 Impact toughnessï¼?>12j/cm2 Breakage rateï¼?12000 Chemical elementsï¼?C Si Mn P S Cr Our advantage: 1. All of the grinding material can do the well-know and most professional in grinding media industry test certificate: SGS 2. All products are our own production, no other commissons expense. We guarantee to provide the best competitive price 3. Delivery on time, due to our production capacity: 100,000 tons/year