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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