Sandvik offers tubes in Sanicro® 28, a high-alloy austenitic stainless steel particularly suited for use in phosphoric acid production.
The phosphate rock contains many impurities, such as chlorides and fluorides, which makes the phosphoric acid very corrosive to metals. The highly corrosion-resistant tube grade Sanicro® 28 is specially developed to replace graphite tubes in heat exchangers for concentration of phosphoric acid. With proper heat exchanger design, tubes in Sanicro® 28 outperform graphite tubes by several years.
Sanicro® 28 characteristics:
- Very high corrosion resistance in strong acids
- Very good resistance to stress corrosion cracking (SCC) and intergranular corrosion in various environments
- High resistance to pitting and crevice corrosion
- Good weldability