Zeron Fastners
Duplex and Super Duplex UNS S32205 Screws
Duplex and Super Duplex UNS S32205 Screws are externally threaded fasteners manufactured from the enhanced Duplex Stainless Steel UNS S32205 (Alloy 2205). They are essentially identical to bolts but are typically specified for components that are driven directly into an existing internal thread or pre-tapped hole. These screws provide the key benefits of Duplex steel: high yield strength (about twice that of standard stainless steel) and outstanding resistance to chloride stress corrosion cracking, crevice, and pitting corrosion. Zeron Fastners supplies these robust screws for critical structural and machine assemblies across industries including marine, oil and gas, and chemical processing.
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Duplex and Super Duplex UNS S32205 Screws Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.030 max |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Phosphorus (P) | 0.030 max |
| Sulfur (S) | 0.020 max |
| Chromium (Cr) | 21.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Nitrogen (N) | 0.08 – 0.20 |
Duplex and Super Duplex UNS S32205 Screws Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (min) | 620 MPa (90 ksi) |
| Yield Strength (0.2% Offset min) | 450 MPa (65 ksi) |
| Elongation in 4D (min) | 25% |
| Hardness (Brinell max) | 290 HB |