General Description

254SMO (UNS N31254) is often referred to as a grade of “6% Moly” due to its molybdenum content. 254SMO is an austenitic stainless steel with high level of chromium, molybdenum and nitrogen, which gives its a good resistance to pitting and crevice corrosion, especially in environments containing halide ions, e.g. chloride, bromide and fluoride solutions. Compared with Alloy 904L, Alloy 20, Alloy 825, 254SMO has superior chloride resistance and is specially suited for high chloride environments such as brackish water or seawater.

Applications for 254SMO include petroleum production, saltwater handling, food processing and chemical processing equipment, pulp mill bleach systems, flue gas desulphurization scrubbers and tall oil distillation columns.

Chemical Composition

Grade Fe% Ni% Cr% Mo% N% C% Mn% Si% S% P% Cu%
254SMO Bal. 17.5-18.5 19.5-20.5 6.0-6.5 0.18-0.22 Max 0.02 Max 1.0 Max 0.8 Max 0.01 Max 0.03 0.5-1.0


UNS S31254

Werkstoff Nr. 1.4547


254SMO Bar: ASTM A276/A479

254SMO Forging: ASTM A473

254SMO Sheet/Plate: ASTM A240

254SMO Pipe/Tube: ASTM A312

Physical Properties

Density:8.0 g/cm3

Mechanical Properties

Solution Annealed

Tensile: Min 650 MPa

Yield: Min 300 MPa

Elongation: Min 35%


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