Reliable Steel is a leading manufacturer and exporter of ASTM/ASME SA 789 Duplex Tubes in mostly countries. We offer best quality ASTM/ASME SA 789 Tubes which is most durable and cost-effective. We fabricated ASTM/ASME SA 789 Tubes in various sizes and lengths. Our Duplex ASTM/ASME SA 789 Tubes has magnetic property, yields strength, tensile strength, outstanding durability, high toughness, long-term working ability etc.
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Duplex A/SA-789 tubes are a type of stainless steel tubing that conforms to the ASTM A789/ASME SA789 standard, known for combining high strength with good corrosion resistance, especially against stress corrosion cracking. They are produced with a duplex (two-phase) microstructure of approximately 50% austenite and 50% ferrite and are used in demanding applications like chemical processing, food processing, and marine environments. Common grades include UNS S31803 and UNS S32205, while super duplex grades like UNS S32750 and S32760 offer even higher performance.
The Duplex A/SA A789 specification covers seamless and welded ferritic/austenitic stainless steel tubing intended for general corrosion resistance and, more specifically, resistance to stress corrosion cracking. Common grades include UNS S31803 (Alloy 2205) and the enhanced UNS S32205.
| Property | Value |
|---|---|
| Minimum Yield Strength | 448 MPa (65 ksi) |
| Minimum Tensile Strength | 621 MPa (90 ksi) |
| Minimum Elongation | 25% |
| Density | 7.8 g/cm³ (0.281 lb/in³) |
| Hardness (Brinell) | 290 max |
| Chromium | Nickel | Molybdenum | Nitrogen |
|---|---|---|---|
| 22.0–23.0% | 4.5–6.5% | 3.0–3.5% | 0.14–0.20% |