Zeron Fastners
Duplex and Super Duplex UNS S31803 Threaded Rods
Duplex and Super Duplex UNS S31803 Threaded Rods are long, continuously threaded bars made from Duplex Stainless Steel (Alloy 2205 / UNS S31803). These rods are critical for applications demanding high tensile strength and superior resistance to environmental degradation, especially chloride-induced stress corrosion cracking and pitting. Zeron Fastners manufactures these rods in various lengths and diameters, which are commonly used as anchor bolts, tie bars, or fully threaded studs when assembled with corresponding Duplex Nuts. The material's ferritic-austenitic microstructure grants it a yield strength significantly higher than conventional austenitic stainless steels like 316. They are essential in chemical processing, oil & gas industry equipment, power generation, and structural components exposed to seawater or high-chloride media.
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Duplex and Super Duplex UNS S31803 Threaded Rods 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 S31803 Threaded Rods 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 |