Shandong Huamin Steel Ball Joint-stock Co.,Ltd(Shandong Huamin Casting and Forging Joint-stock Co.,Ltd) is one of the largest manufacturers and exporters for grinding steel ball and rod mill in China, the annual production output is 200,000 metric tons. Our products are mainly exported to USA, Canada, Chile, South Africa, Italy, Greece, Korea and Japan more than 30 countries and regions in the world. Product Description Our cast iron grinding balls can be divided into three categories including the high chromium type, medium chromium type and the low chromium type. The Quality Index of the High Chromium Type The chromium content of the high chromium type product is greater than or equal to 10.0%. And the carbon content is between 1.8% and 3.20%. It is required by the national standard that the hardness of the high chromium type product must be no less than 58HRC, and that the impact value should be greater than or equal to 3.0 J/cm2. This type of product must go through the hot quenching and the tempering treatment to come up to the hardness. Currently in China, there are two quenching methods for this type of product including oil quenching and wind quenching. If the tested hardness of this type of product is below 54HRC, then it shows that the quenching treatment is omitted. Testing Our lab is equipped with advanced testing machine to strictly control the quality of the product. Packaging Barrel with wooden pallet: Steel Drum or Steel Barrel Two Barrel tie on the wooden pallet, steel tape for bundle Strong Nylon Bag: Avalible Bag: 50kgs; 100kgs; 1000kgs Certifications Our company has obtained ISO 9001 International Quality System Authentication, ISO14001 Environmental System Management Authentication and ISO18001 occupational health and safety certification, safety standardization identification, clean production enterprise certification. � We welcome customers both at home and abroad to come to negotiate business with us, we sincerely promise you. We are trying our best to supply you with high quality products, reasonable price, timely delivery with satisfactory service as the basis of our long-term cooperation. � Insisting on the theory of "Credit Goal, Quality Life, Market First, Customer God", our company is establishing the largest professional producing and exporting base in China, which include grinding steel balls and rod mill products. "Winning on quality, making up to the world" is our eternal promise.