DIN 1.4547 High Molybdenum Content Corrosion Resistant Super Austenitic Stainless Steel Plate 254SMO UNS S31254

254SMO is a high-performance austenitic stainless steel with excellent corrosion resistance properties. The high molybdenum content combined with elevated chromium and nitrogen levels provides superior resistance to pitting and crevice corrosion. Copper additions enhance corrosion resistance in specific acidic environments.
With its high nickel, chromium, and molybdenum content, 254SMO offers excellent stress corrosion cracking resistance. Extensive field testing confirms its exceptional crevice corrosion resistance in seawater, even at elevated temperatures. The material's corrosion performance in acidic solutions and oxidizing halide environments matches that of premium nickel-based and titanium alloys.
The high nitrogen content provides enhanced mechanical strength compared to conventional austenitic stainless steels, while maintaining excellent ductility, impact strength, and weldability.

254SMO features a face-centered cubic lattice structure. Standard annealing at 1150-1200°C produces the austenitic structure. While minor metal mesophase traces may appear in the material center, they typically don't adversely affect impact strength or corrosion resistance. Grain boundary precipitation may occur at 600-1000°C.

The ultra-low carbon content minimizes carbide precipitation risk during heating. 254SMO passes ASTMA262 Strauss Test specifications even after sensitization at 600-1000°C. While grain boundary deposits may form at these temperatures, they don't typically cause intergranular corrosion in most applications.
In chloride, bromide, or iodide solutions where conventional stainless steels suffer pitting, crevice corrosion, or stress corrosion cracking, 254SMO maintains excellent performance. The material shows superior corrosion resistance in sulfuric acid compared to 316 stainless steel and performs well in diluted hydrochloric acid at ambient temperatures.

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