Chemical elements： C Mn Cr Si S P 2.0-3.5 0.5-1.5 11-14 ≤1.0 ≤0.06 ≤0.06 Hardness: HRC60-68 Our company is one of the biggest manufactures and exporters of grinding balls and iron products, founded in 1970,with the acreage 70,000 m2, staff more than 390,the capacity is 50000 tons annual and exporting to Japan, Korea, Malaysia, South Africa, Canada, Australia, USA. and Europe more than 40 countries and areas, our products are widely used in mining, power station, chemical industry, cement plant and construction areas, they can meet various requests from different customers.We have obtained the certificate of ISO9001:2000 and EMS14001.We will provide best service to your esteemed company.