254 SMO®

254 SMO®
UNS S31254

Avesta Sheffield 254 SMO is an austenitic stainless steel which due to its high molybdenum content possesses very high resistance to pitting and crevice corrosion. The steel grade was developed by Avesta Sheffield for use in halide-containing environments such as seawater. 254 SMO also shows good resistance to uniform corrosion and, especially in acids containing halides, this steel grade is superior to conventional stainless steels.

254 SMO is a registered trademark of Outokumpu OYJ, LLC

ASME Boiler and Pressure Vessel Specifications
Sheet/ Plate Forgings Weld Fittings Rod and Bar Tubing - Welded/ Smls Pipe - Welded/ Smls Bolting- Bolts/ Nuts Filler Metals
SA240 SA182 SA403 SA479 SA249/ SB213 SB312/   SB312 SA193-B8MLCuN/ SA194-GR8MLCuN ERNiCrMo-3 

ASME Boiler and Pressure Vessel Chemical Requirements for Sheet/Plate
Note: all percentages max unless otherwise specified
C Mn Si P S Cr Ni Mo N Cu
0.02 1.00 0.80 0.03 0.01 19.50-20.50 17.5-18.50 6.00-6.50 0.18-0.22 0.50-1.00

ASME Boiler and Pressure Vessel Mechanical Properties for Sheet/Plate
Tensile Strength, Min ksi Yield Strength, (0.2% offset), Min, ksi Min. Elongation in 2", % Density lb/in³
94 44 35.0 0.289

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