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Alloy 254SMO Technical Information - 254 SMO Plate
254SMo is an austenitic stainless steel specifically developed for use in halide-containing environments such as seawater. This steel demonstrates superior performance particularly in halide-containing acids and offers excellent resistance to uniform corrosion. With carbon content below 0.02%, it is classified as pure austenitic stainless steel, and when carbon content is under 0.01%, it qualifies as super austenitic stainless steel.
Features of Inox 254SMo
Super stainless steel represents a specialized category of stainless steel distinguished from conventional grades by its high alloy content of nickel, chromium, and molybdenum. The most prominent example is 254SMo with 6% molybdenum content. This high molybdenum concentration provides exceptional local corrosion resistance, including excellent resistance to pitting corrosion (PI ≥ 40) and stress corrosion in demanding conditions such as seawater, aeration, crevices, and low-speed scouring. These properties make 254SMo a viable alternative to nickel-based alloys and titanium alloys.
Additionally, 254SMo exhibits superior high-temperature resistance and corrosion performance unmatched by 304 stainless steel. Metallurgically, this special stainless steel maintains a stable austenitic structure.
Extensive field testing and practical experience confirm that 254SMo maintains high crevice corrosion resistance in seawater, even at elevated temperatures—a characteristic shared by only a few stainless steel types. In acidic solutions and oxidizing halide solutions used in paper bleaching applications, 254SMo demonstrates corrosion resistance comparable to the most resistant nickel-based alloys and titanium.
The high nitrogen content in 254SMo provides enhanced mechanical strength compared to other austenitic stainless steels, while maintaining high ductility, impact strength, and excellent weldability. The elevated molybdenum content results in higher oxidation rates during annealing, producing a slightly rougher surface after pickling than conventional stainless steels, though this does not compromise corrosion resistance.
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