1 > High Hardness: Surface hardness: HRC57-67 HRC, volume hardness HRC56-64. 2 > High Impact Toughness: The impact toughness of our grinding balls is more than 12 J / cm2. 3 > Low Broken Rate: the actual broken rate is not higher than 1%. 4 > Good wear-resistant and lower wear rate. Company Information Shandong Iraeta is a Sino-Spanish joint venture and its shareholders include Gestamp group which is the biggest steel deep processing enterprise of Spain. Shandong Iraeta has been one of the leading forging enterprises of China since it started business in 1975, Until now, it owns more than 20 international and industrial certifications and has assisted the draft and approval of two national industrial standards as well as one Torch Program project. With over 20 of the global top 500 enterprises purchasing various kinds of forgings from us for different uses, we have customers in the fields of mining, shipbuilding, Petrochemical industry, wind power mechanical manufacturing, ect. Raw material Iraeta had strict quality control procedures for raw materials which were only purchased from audited steel mills, so the performances of grinding ball could be assured from source. Moreover, Iraeta set up the academician workstation cooperated with Shenyang Metal Institution of CAS, which enabled us to supply customized raw materials since the grinding media requirements varied by different region mines. Technical strength With our special heat treatment, the grinding rod has low wear rate, high hardness (about 45-55 HRC) and good toughness. After removing the internal stress by quenching and tempering, our grinding rod will not break, bent or thin for two sides. The good resistance will help customers decrease the total costs. With the powerful technological strength, we are capable to meet customersâ?? requirements for any specification, which increases flexibility largely and reduces unnecessary waste.