The main function of the grinding media steel ball is to grind, which can make the material grinding finer, mainly used in mines, power plants and other fields. As a user, when purchasing this product, you need to consider its quality indicators. For example, the quality index of the low-chromium ball of the grinding medium steel ball is 0.5% to 2.5% of the chromium content, and the carbon content is between 1.80% and 3.20%, which is called the low-chromium ball. The hardness (HRC) is ≥45 or more, and the impact value is ak. ≥1.5J/cm2.
In order to ensure the quality of the grinding media steel ball, in the process of production, high temperature tempering treatment is needed to eliminate the casting stress. For example, the surface of the steel ball is dark red to indicate that the product has been subjected to high temperature tempering treatment, such as steel ball. The surface is still metallic, indicating that the product is not tempered at high temperatures.
In the grinding media steel ball, the quality requirement for the medium chrome ball is that the hardness index should be above 47, and the chromium content is 3.0% to 7.0%, the carbon content is between 1.80% and 3.20%, and the impact value is ak ≥ 2.0. J/cm2. For high-chromium balls, the chromium content is required to be ≥10.0%, the carbon content is between 1.80% and 3.20%, the hardness (HRC) is ≥58 or more, and the impact value is ak≥3.0J/cm2.