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It can withstand a wide range of acids due to the high alloying content of chromium and molybdenum. Resistance to pitting and crevice corrosion is determined mainly by the chromium, molybdenum, and nitrogen content. 254 SMO has high amounts of these elements and is suitable for demanding environments like chlorinated sea water.
Resistance to stress corrosion cracking increases with increased content of nickel and molybdenum in particular. This means that 254 SMO has very good resistance to stress corrosion cracking. It is also characterized by high ductility and impact strength，with strength nearly twice that of 300 series stainless steel.
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 |
Density: 8 g/cm3
Stainless steel 254SMO Equivalent Grades
STANDARD | WERKSTOFF NR. | UNS | AFNOR | EN |
SMO 254 | 1.4547 | S31254 | Z1 CNDU20.18.06AZ | X1CrNiMoCuN20-18-7 |
Stainless steel 254SMO ASTM Specifications
Pipe, SMLS& Welded | Tube, SMLS& Welded | Tube, Seamless | Sheet/Plate | Bar /Rod | Forging /Flange | BW Fittings |
ASTM A312 | ASTM A269 | ASTM A213 | ASTM A240 | ASTM A276/A479 | ASTM A182 | ASTM A403 |
Stainless steel 254SMO Application:
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.
