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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 less than 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 ordinary grades by its high alloy content of nickel, chromium, and molybdenum. The most prominent example is 254SMo with 6% molybdenum content, which provides exceptional local corrosion resistance. This material exhibits superior resistance to pitting corrosion (PI ≥ 40) and stress corrosion cracking in demanding conditions including seawater, aeration, crevice environments, and low-speed scouring applications, making it an excellent alternative to nickel-based alloys and titanium alloys.
254SMo demonstrates outstanding high-temperature resistance and corrosion performance that surpasses conventional 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 environments typical of paper bleaching applications, 254SMo exhibits corrosion resistance comparable to the most advanced nickel-based alloys and titanium alloys.
The high nitrogen content in 254SMo provides enhanced mechanical strength compared to other austenitic stainless steels, while maintaining excellent ductility, impact strength, and 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 the material's corrosion resistance.
Specification
Material Standards
Standard
UNS
Werkstoff Nr.
EN
SS
AFNOR
254 SMO
S31254
1.4529
X1CrNiMoCuN20-18-7
2378*
Z1 CNDU 20.18.06AZ*
Chemical Composition
Element
Content (%)
Iron, Fe
55.69
Chromium, Cr
20
Nickel, Ni
18
Molybdenum, Mo
6.1
Nitrogen, N
0.20
Carbon, C
0.010
Mechanical Properties
Properties
Metric
Imperial
Tensile strength
680 MPa
98600 psi
Yield strength
300 MPa
43500 psi
Modulus of elasticity
195 GPa
28300 ksi
Shear modulus
75 GPa
10900 ksi
Poisson's ratio
0.30
0.30
Elongation at break
50 %
50 %
Hardness, Brinell
210
210
Applications
Ocean: Marine structures in sea environments, seawater desalination, marine aquaculture, seawater heat exchange systems
Environmental Protection: Flue gas desulfurization equipment for thermal power generation, wastewater treatment facilities
Energy: Nuclear power generation, comprehensive coal utilization, ocean wave power generation systems
Petrochemical Industry: Refining operations, chemical processing equipment
Food: Salt production, soy sauce brewing processes
High Concentration Chloride Environments: Paper industry applications, various bleaching equipment
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