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Dear Sir/Madam, Chongqing Tiger Fortune Technology and Development Co., ltd was founded in 1997 and located in the South-West of China, occupying 10,656 square meters in size. With our high-quality CNC machines ,we are your best manufacturing go-to source of precision machined spare parts. Cast iron grinding balls--Grinding balls included one kind named chrome cast iron grinding balls, three series (High/Middle/Low chrome cast iron grinding balls) can be provided in standard sizes. 1.Product Name: Cast iron grinding balls 2.Standard ball sizes are as follows: Ball Diameter (nominal) mm-----(nominal) Inches 20mm 4/5 inch 25mm 1 inch 30mm 1 1/4nch 40mm 1 1/2nch 50mm 2 inch 60mm 70mm 80mm 3 1/4inch 90mm 3 1/2 inch 100mm 4 inch 110mm 4 1/4 inch 120mm 4 3/4inch 3. A full range hardness we provided in standard sizes: Minimum Hardness: Brinell Rockwell C Chromium (%) BHN400 HRC 43 non-chromium BHN480 HRC 50 Cr: 1.0 3.0 BHN560 HRC 55 Cr: 7.0 10.0 BHN615 HRC 58 Cr: 10.0 16.0; Cr: 16.0 22.0; Cr: 22.0 28.0; 4. Low Chrome cast iron balls Chemical Elements (%): C:2.0 3.60 Mn: 0.50-1.50; Cr: 1.0-5.0; Si: 1.5Max; P: 0.10 Max, S:0.10 Max; 5. Middle chrome cast iron balls Chemical Elements (%):C:2.0 3.20 Mn: 0.50-1.50; Cr: 7.0-10.0; Si: 0.5-2.20; P: 0.10 Max, S:0.10 Max; 6. High chrome cast iron balls ZQCrG1--Chemical Elements (%):C:2.0 3.20 Mn: 0.50-2.50; Cr: 10.0-16.0; Si: 1.0 Max ; P: 0.10 Max, S:0.06 Max; Cu: 1.0Max; Mo:1.0 Max ZQCrG2--Chemical Elements (%):C:2.0 3.20 Mn: 0.50-2.50; Cr: 16.0-22.0; Si: 1.0 Max ; P: 0.10 Max, S:0.06 Max; Cu: 1.0Max; Mo:1.0 Max ZQCrG3--Chemical Elements (%):C:2.0 3.20 Mn: 0.50-2.50; Cr: 22.0-28.0; Si: 1.0 Max ; P: 0.10 Max, S:0.06 Max; Cu: 1.0Max; Mo:1.0 Max Tiger Fortune is specialized in producing & exporting precision machined spare parts and tools in accord with your spec and quantities. Our products have been supplying to customers in UK, Australia, Europe, Middle East, South America, and etc with fewer quality problem and with good reputation. Customers are welcome to explore our sincere business motivation with you, do not hesitate to contact us for more information you need . Best Regards Jon Our website: My emails: Manager Foreign Trade Dept.2 Chongqing Tiger Fortune Technology and Development Co., Ltd