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254SMO is an austenitic stainless steel. Due to its high molybdenum content, it has extremely high resistance to pitting and crevice corrosion. This grade of stainless steel was created for containing halides environments such as seawater.
Stainless steel 254SMO also has high ductility and impact strength，with strength nearly twice than 300 series stainless steel.
International Equivalent Name
254 SMO, UNS S31254, 1.4547, F44, NAS185N, 6Mo, 00Cr20Ni18Mo6CuN
Implementation Standard
ASTM A240/ASME SA-240, ASTM A276, ASTM A182/ASME SA-182, ASTM A312/ASMES A312
Material Standard
Conforms to BS EN 10088-3 standard, material number 1.4547.
Grade | C≤ | Mn≤ | P≤ | S≤ | Si≤ | Cr | Mo | Ni | Cu | N |
254SMO | 0.02 | 1 | 0.03 | 0.01 | 0.8 | 19.5-20.5 | 6.0-6.5 | 17.5-18.5 | 0.5-1.0 | 0.18-0.25 |
Mechanical properties | Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) | Hardness, HB（max） |
S31254 | 100【690】 | 45【310】 | 35 | 223 |
Grade | Alloy 254 smo |
Density | 8.0 kg/dm^3 |
Modulus of Elasticity | 195 GPa |
Linear Expansion at 68 to 212oF (20 to 100oC) | 16.5 X10^-6/oC |
Thermal Conductivity | 14 w/moC |
Thermal Capacity | 500 J/kgoC |
Electrical Resitivity | 0.85 μΩm |
High ductility: The alloy has high ductility, which is easy to process and form.
High resistance to pitting corrosion: It has high resistance to pitting and crevice corrosion.
Excellent corrosion resistance: It has excellent corrosion resistance in a variety of industrial environments, including salt spray environments.
Higher mechanical strength: Compared with other grades of stainless steel, UNS S31254 provides greater mechanical strength and enhanced pitting resistance.
Good processability and weldability: TIG welding is usually used, with high arc energy and concentrated heat; and there is a cooling effect of argon gas flow, and the heat-affected zone is small, which is conducive to improving the intergranular corrosion resistance of the welded joint. At the same time, the welding quality is stable, the weld is well formed, and there is no spatter and slag.
STANDARD | WERKSTOFF NR. | UNS | AFNOR | EN |
SMO 254 | 1.4547 | S31254 | Z1 CNDU20.18.06AZ | X1CrNiMoCuN20-18-7 |
Product | Standard | Show |
Pipe SMLS& Welded | ASTM A312 |  |
Tube SMLS& Welded | ASTM A269/A213 |  |
Sheet / Plate | ASTM A240 |  |
Bar / Rod | ASTM A276/A479 |  |
Forging / Flange | ASTM A182 |  |
BW Fittings | ASTM A403 |  |
Tanks and pipelines for chemicals with high halide contents
Flue gas desulfurization
Equipment in pulp bleaching plants
Components in gas cleaning systems
Hydraulic and instrumentation tubing
Equipment for handling of seawater, such as seawater cooling, cooling water pipes, ballast water systems, firefighting systems etc.
