Alloy 254 SMO® is an austenitic stainless steel with a high molybdenum content. Coupled with Nickel and Copper this gives the alloy a good resistance to pitting and crevice corrosion, especially in environments containing halide ions, e.g. chloride, bromide and fluoride solutions.
254 SMO® (UNS S31254) may offer a cost effective solution to Nickel and Titanium alloys in these environments.
Specifications
| 254SMO® – UNS S31254 | |
| Product | Norm ASTM |
| Seamless Tubes | A-269 A-312 |
| Welded Tubes | A-249 A-269 A-312 A-358 A-409 |
| Plates | A-240 A-480 |
| Bars | A-276 A-479 |
| Flanges | A-403 A-473 |
| Fittings | A-182 F44 A-403 |
Chemical specifications %
| 254SMO® – UNS S31254 | ||
| Element | Simbol | Maximum % |
| Carbon | C | 0,020 |
| Manganese | Mn | 1,00 |
| Phosphorus | P | 0,030 |
| Sulfur | S | 0,015 |
| Silicon | Si | 0,80 |
| Nickel | Ni | 17,5-18,5 |
| Chrome | Cr | 19,5-20,5 |
| Molybdenum | Mo | 6,0-6,5 |
| Nitrogen | N | 0,18-0,22 |
| Copper | Cu | 0,50-1,00 |
Mechanical Properties
| 254SMO® – UNS S31254 | |||||||
| Norm | Rm min. | Rp 0,2% min. | E4d min.% | Z min.% | T.I.(J) | HR B | HB |
| A-182 | 94 (650) | 44 (300) | 35 | 50 | 35 | ||
| A-240 | 95-100 (655-690) | 45 (310) | 35 | 96 | 223 | ||
| A-249 | 95-98 (655-675) | 45 (300-310) | 35 | 100 | |||
| A-269 | |||||||
| A-312 | 95-98 (655-675) | 45 (310) | |||||
| A-358 | |||||||
| A-403 | 94-119 (650-820) | 44 (300) | |||||
| A-409 | 94 (650) | 44 (300) | |||||
| A-473 | 94 (650) | 44 (300) | 35 | 50 | |||
| A-479 | 95 (655) | 44 (305) | 35 | 50 | |||
| A-480 | |||||||
