Food Processing Equipment
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Sanitary-grade alloys for tanks, mixers, conveyors, and processing machinery in food manufacturing. Equipment alloys must resist acidic food products, withstand aggressive CIP cleaning chemicals, and meet FDA and EHEDG surface finish requirements.
The food and beverage industry requires alloys that are non-toxic, easy to clean, resistant to acidic and alkaline foods, and capable of withstanding repeated sanitization. Regulatory frameworks (FDA 21 CFR, EU 1935/2004) strictly control which alloys may contact food products, making material selection a matter of public health as well as engineering.
Material Requirements
Food-contact alloys must resist corrosion from organic acids (citric, acetic, lactic), chloride sanitizers, and CIP (clean-in-place) chemicals. Surface finish must be ≤0.8 µm Ra for hygienic design. Materials must not impart taste, odor, or color to food products. Welded joints must be ground flush and fully penetrated to prevent bacterial harborage. Temperature cycling from −40 °C (freezing) to 150 °C (sterilization) is routine.
Key Alloys
Stainless steel 304 (18/8) is the universal food-contact alloy for tanks, piping, and work surfaces. 316L provides extra chloride resistance for salty foods, pickles, and soy sauce processing. Duplex 2205 handles concentrated brine and high-temperature dairy pasteurization. Aluminum 3004 and 5182 form beverage can bodies and lids. Tin-plated steel (tinplate) remains the standard for canned goods worldwide.
Future Trends
Antimicrobial copper alloys (Cu-Ni, Cu-Sn) are being integrated into food processing surfaces to reduce pathogen transfer. Lean duplex stainless steels offer 304-equivalent corrosion resistance at lower nickel cost. Electropolished surfaces with Ra ≤0.4 µm are becoming standard for pharmaceutical-grade food production, and nano-textured stainless surfaces provide lotus-effect self-cleaning properties.