Scrubbers in production use EN 1.4547 (254SMO / 6Mo) and EN 1.4562 (Alloy 31). These grades are used due to the corrosive environments they encounter.
The 6Mo super austenitic steel combines moderate tensile strength and high ductility with excellent corrosion resistance in seawater and various industrial environments. Typically the alloy has PREN of 42 – 44, which ensures that the resistance to pitting corrosion is high, and it also has a high resistance to crevice corrosion.
Alloy 31 is a nickel, chromium, and molybdenum stainless steel with nitrogen and copper additions. It combines moderate tensile strength and high ductility with excellent corrosion resistance in sulfuric acid, reducing and oxidizing media, and has strong resistance to corrosion and erosion-corrosion in a phosphoric environment. Typically the alloy has PREN of ≥ 48, which ensures that the resistance to pitting corrosion is high.
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