Zeron Fastners
Duplex and Super Duplex UNS S31803 Screws
Duplex and Super Duplex UNS S31803 Screws are high-strength, externally threaded fasteners manufactured from Duplex Stainless Steel (UNS S31803 / Alloy 2205). Zeron Fasteners specializes in supplying these robust screws, which are essential for structural and machine assemblies in aggressive industrial settings. The product is characterized by its high yield strength (nearly twice that of common austenitic grades like 316) and outstanding resistance to pitting, crevice corrosion, and chloride stress corrosion cracking. This material is the workhorse of the Duplex family, offering a cost-effective solution for corrosion issues. The primary application of these UNS S31803 Screws includes fastening chemical pump and valve bodies, heat exchangers, water treatment systems, and structural components in offshore and marine environments.
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Duplex and Super Duplex UNS S31803 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 S31803 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 |