How to Choose the Right Granulating Roller Material: Stainless Steel vs. Alloy Steel in NPK and Organic Fertilizer Production
The key to choosing between stainless steel and alloy steel for granulating rollers lies in one operational variable: the corrosivity of the raw materials. For NPK formulations containing phosphates, chlorides, or high moisture content (e.g., ammonium-based NPK and fermented organic fertilizers), 316L stainless steel rollers can extend service life from 3-5 years to 8-15 years, more than doubling uptime. For applications with high mechanical requirements and low corrosivity (e.g., compacting organic granules), alloy steel (including 40CrNiMo) or high-chromium cast iron offers superior wear resistance at a lower initial cost, and hardness typically exceeds HRC 55.
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