Product Quality Standard：
1. The chemical composition of the high chromium type product should conform to the below table. We can also offer the products with special chemical composition in accordance with the requirements of the customers.
2. The nominal diameter, allowable deviation, maximum diameter, minimum diameter of the cast grinding steel ball should be in accordance with the following table.
3. The high chromium type of product can be manufactured with the mechanical properties following the requirements of customers.
4. Surface Quality & Internal Quality
4.1. The surface of the cast iron grinding ball is not allowed to have the casting defects such as the crack, and the obvious gas porosity, inclusion, shrinking cavity, cold shut, elephant skin, etc.
4.2. Internal Quality
It is not allowed to have the shrinkage cavity, shrinking porosity, gas porosity, inclusion, and other cavity defects on the section including plane pasting through the pouring gate and the ball center.
5. Testing Method and Inspection Rules.
5.1. Impact Test
5.2. Rockwell Hardness Test Specimen Preparation
5.3. Chemical Composition Inspection
5.4. Surface Hardness Inspection
5.5. Internal Quality Inspection
Let us know your detail demands and inquiry now.
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