254SMO, also designated as UNS S31254 and W.Nr. 1.4547, is a high-end austenitic stainless steel known for its exceptional resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking. With high levels of molybdenum (up to 6%) and nitrogen, 254SMO offers performance comparable to some nickel-based alloys in seawater and aggressive chemical environments.
254SMO is widely used in seawater desalination, chemical processing, offshore oil and gas, pulp and paper bleaching equipment, and heat exchangers. Its excellent weldability, durability, and superior corrosion resistance make it a preferred material for demanding applications where conventional stainless steels may fail.
| Element | Content (%) |
| Iron, Fe | 55.69 |
| Chromium, Cr | 20 |
| Nickel, Ni | 18 |
| Molybdenum, Mo | 6.1 |
| Nitrogen, N | 0.2 |
| Carbon, C | 0.01 |
| Properties | Metric | Imperial |
| Density | 8 g/cm3 | 0.289 lb/in3 |
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 680 MPa | 98600 psi |
| Yield strength | 300 MPa | 43500 psi |
| Modulus of elasticity | 195 GPa | 28300 ksi |
| Shear modulus | 75 GPa | 10900 ksi |
| Poisson’s ratio | 0.30 | 0.30 |
| Elongation at break | 50 % | 50 % |
| Hardness, Brinell | 210 | 210 |
| Institute | Standard |
| ASTM | A182, A213, A249, A269, A276, A312, A358, A409 |
| NFA | 49-217 |
| EN | 10216-5, 10088-3 |
Standard product forms of 254SMO/S31254/1.4547 are pipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon and wire. The products are available in a wide variety of sizes. Please contact us at [email protected] for full information.
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