Grades
Products
Min Temp
Max Temp
Min tensile strength · Duplex 2205 per ASTM A182 F60
PREN 35+ · pitting & crevice corrosion resistance
Density (avg) · dual austenite-ferrite microstructure
| Property | Specification |
|---|---|
| Microstructure | 50% Austenite + 50% Ferrite |
| Cr Content | 21–23% |
| Ni Content | 3–7% |
| Max Service Temperature | 300°C |
| PREN | ≥ 35 (2205) |
| ASTM Standards | A182 F60, A276 |
Multiple fastener grades and material grades of Duplex Steel Fasteners exist for demanding industrial fasteners and engineering applications, each providing distinct mechanical properties, corrosion resistance, temperature capability, and strength. Compare the available grades below to support precise material selection aligned with operating environment, industry standards, and specific engineering requirements.
| Grade | UNS | PREN | Key property | Max temp | Best application | |
|---|---|---|---|---|---|---|
| Duplex 2205 (Most popular) | UNS S32205 | ≥ 35 | Chloride + strength | 300°C | Offshore, pulp & paper | View grade |
| Duplex 2304 | UNS S32304 | ≥ 25 | Moderate chloride | 280°C | Water treatment, tanks | View grade |
| Property | Duplex 2205 | Super Duplex 2507 | SS 316L |
|---|---|---|---|
| PREN (pitting resistance) | >=35 | >=40 | ~24 |
| Max service temp | 300°C | 300°C | 800°C |
| Yield strength (min) | 450 MPa | 550 MPa | 170 MPa |
| Tensile strength (min) | 620 MPa | 795 MPa | 485 MPa |
| Relative cost | Medium-High | High | Medium |
| NACE MR0175 compliant | Yes | Yes | Conditional |
Verdict: Duplex 2205 covers most offshore and chloride applications. Super Duplex 2507 is required where PREN >=40 is specified for subsea NORSOK M-630 service. SS 316L is the entry-level option for mild chloride environments.
