Zeron Fastners
Duplex and Super Duplex UNS S32205 Hex Bolts
Duplex and Super Duplex UNS S32205 Hex Bolts are externally threaded fasteners featuring a six-sided (hexagonal) head, widely recognized as the industry standard for high-strength bolting. Manufactured from Duplex Stainless Steel UNS S32205 (Alloy 2205), these bolts are characterized by a higher nitrogen content than the older S31803 specification, enhancing their strength and resistance to pitting corrosion. They offer superior yield strength—roughly double that of 316L stainless steel—combined with excellent resistance to chloride stress corrosion cracking. Zeron Fastners supplies these critical bolts for structural applications, pressure vessels, chemical tankers, and offshore platforms where maximum corrosion protection and robust mechanical integrity are required.
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Duplex and Super Duplex UNS S32205 Hex Bolts 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 Hex Bolts 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 |