254 SMO is a high performance austenitic stainless steel. Its high alloying elements content imparts excellent resistance to uniform, pitting and crevice corrosion, and stress corrosion cracking. It was originally developed to withstand the corrosion of acids, especially in the presence of halide ions, such as hydrochloric acid, hydrofluoric acid, phosphoric acid, and sulphuric acid contaminated with chlorides. In certain environments it is an alternative to more expensive nickel alloys and titanium alloys.
Chinese designation: 254 SMO 超级奥氏体不锈钢
| Element | Min % | Max % |
|---|---|---|
| Cr | 19.5 | 20.5 |
| Ni | 17.5 | 18.5 |
| Mo | 6 | 6.5 |
| Mn | — | 1 |
| Cu | 0.5 | 1 |
| Si | — | 0.8 |
| N | 0.18 | 0.22 |
| P | — | 0.03 |
| C | — | 0.02 |
| S | — | 0.01 |
| Fe | balance | — |
Chemical composition per the grade specification. Values are nominal; the certified analysis is issued with every order on EN 10204 3.1 documentation.
| Product form | ASTM / EN specification |
|---|---|
| Rod, bar and shape | A 276, A 484 |
| Plate, sheet and strip | A 240, A 480 |
| Seamless and welded pipe | A 312, A 999 |
| Welded pipe | A 814, A 999 |
| Seamless and welded tubing | A 269, A 1016 |
| Fitting | A 403, A 960 |
| Forged or rolled pipe flange and forged fitting | A 182, A 961 |
| Forging | A 473, A 484 |
254 SMO (UNS S31254, DIN W. Nr. 1.4547) is a stainless steels grade. 254 SMO is a high performance austenitic stainless steel. Its high alloying elements content imparts excellent resistance to uniform, pitting and crevice corrosion, and stress corrosion cracking. It was originally developed to withstand the corrosion of acids, especially in the presence of halide ions, such as hydrochloric acid, hydrofluoric acid, phosphoric acid, and sulphuric acid contaminated with chlorides. In ce
ROBAN supplies 254 SMO as rod, bar and shape, plate, sheet and strip, seamless and welded pipe, welded pipe, seamless and welded tubing, with custom dimensions to your drawing.
Yes. Every order ships with EN 10204 3.1 material certification covering the actual heat analysis. 3.2 documentation is available where the contract requires it.
Stock items ship within 3 to 7 working days. Cut-to-size and forged items typically run 15 to 30 working days depending on quantity and specification. Send us your drawing or enquiry for a firm lead time.
Drawing, grade, dimensions, quantity and delivery date — we price from those.
Request a Quote →Heat analysis certificate issued with every order at no extra charge.
Quality documentation →Shearing, sawing and machining to the tolerances on your drawing.
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