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GRINDING MEDIA QUALITY For over 25 years, WELCAST has had a tradition of supplying the finest quality cast high chromium grinding media to the cement industry. WELCAST's knowledge of foundry processes, heat treatment and application has been essential to this tradition.
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WELCAST balls consist of a martensitic matrix
and 76 Rockwell C hardness chromium carbides (25-40 %). This structure provides shock
resistance and is the main deterrent to wear. Specific matrix hardness, carbide
distribution, and microstructure are designed for each individual application. SELECTION OF THE ALLOYS The mill's working conditions are important factors in determining the most suitable alloy for any given application. Because mill parameters and grinding conditions vary considerably, the primary wear mechanisms also vary, These primary wear mechanisms are Abrasion, Impact and Corrosion. WELCAST uses a marked ball test procedure to determine which wear mechanisms are dominant. Balls are marked by drilling identification holes into them and are then brought to identical weights. After operating in a full scale mill for a period of time, these test balls are recovered and reweighed. Their weight loss per unit of surface area is then calculated. This specific wear rate is used to compare various WELCAST alloys to the grinding media currently being used. |
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