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SMO 254 is super-austenitic stainless steel that offers good corrosion resistance, particularly in chloride-containing environments. It has high molybdenum, chromium, and nitrogen content. It has higher strength and ductility than other types of stainless steel, making it suitable for use in various industries such as chemical, petrochemical, and marine.
SS 316 is a popular grade of stainless steel known for its corrosion resistance and high-temperature strength. Its properties are due to a combination of metals, including chromium, nickel, and molybdenum. Stainless steel 316 is commonly used in food and beverage processing, pharmaceuticals, and medical devices.
| Grade | SMO 254 | Stainless Steel 316 |
| Corrosion Resistance | Excellent resistance to chloride stress corrosion cracking, pitting, and crevice corrosion | Generally more resistant than 304; good in atmospheric environments and many corrosive media |
| Strength | Twice that of stainless steel 300 series | Lower than SMO 254 |
| Machinability | Difficult due to high work hardening rate and lack of sulfur content | Good |
| Weldability | Requires filler materials for good strength properties | Excellent |
| Heat Resistance | Good up to 1204 °C | Good up to 870 °C |
| Hardening | Not responsive to heat treatment | Only possible through cold reduction |
| Applications | Saltwater handling, tall oil distillation columns, flue gas desulfurization scrubbers, petroleum production components, food processing equipment, chemical industry process equipment, pulp and paper industry bleaching equipment, flue-gas cleaning, desalination, heat exchangers | Industrial, architectural, and transportation fields; marine environments |
| Grade | % | Ni | Cr | Mo | Cu | N | C | Mn | Si | P | S |
| SMO 254 | Min. | 17.5 | 19.5 | 6 | 0.5 | 0.18 | |||||
| Max. | 18.5 | 20.5 | 6.5 | 1 | 0.22 | 0.02 | 1 | 0.8 | 0.03 | 0.01 |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | Fe |
| SS 316 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 16.00 - 18.00 | 2.00 - 3.00 | 11.00 - 14.00 | 67.845 min |
| STANDARD | WERKSTOFF NR. | UNS | AFNOR | SIS | EN |
| SMO 254 | 1.4547 | S31254 | Z1 CNDU 20.18.06Az | 2378 | X1CrNiMoCuN20-18-7 |
| STANDARD | WERKSTOFF NR. | UNS | JIS | AFNOR | EN |
| SS 316 | 1.4401 | S31600 | SUS 316 | Z7CND17‐11‐02 | X5CrNiMo17-12-2 |
SMO 254 offers superior corrosion resistance, strength, and heat resistance compared to stainless steel 316, but is more difficult to machine and requires specific filler materials for welding. Stainless steel 316, on the other hand, offers good machinability and weldability, making it a suitable option for a variety of industrial applications.
