ASTM A789 UNS S31803 Duplex Steel Tube 2205 Seamless Tubing
2205 ASTM A789 UNS S31803 Duplex Stainless Steel Seamless Tube
Duplex S31803 is also known as UNS S32205, referring to its composition of approximately 22% chromium, 5% nickel, 3% molybdenum, and 2% nitrogen. A789 S31803 tubes are classified as "duplex" stainless steel, which means they have a two-phase microstructure consisting of both austenite and ferrite. This dual-phase structure provides a combination of high strength and excellent corrosion resistance, making it suitable for demanding applications.
Equivalent Grade of ASTM A789 UNS S31803 Duplex Stainless Steel Tubes
| Grade | UNS No |
Old British | Euronorm | Swedish SS | Japanese JIS | ||
|---|---|---|---|---|---|---|---|
| BS | En | No | Name | ||||
| 2205 | S31803 / S32205 | 318S13 | - | 1.4462 | X2CrNiMoN22-5-3 | 2377 | SUS 329J3L |
Physical Properties of ASTM A789 UNS S31803 Duplex Stainless Steel Tubes
| Grade | Density (kg/m3) |
Elastic Modulus (GPa) |
Mean Co-eff of Thermal Expansion (μm/m/°C) |
Thermal Conductivity (W/m.K) |
Specific Heat 0-100°C ( J/kg.K) |
Electrical Resistivity (nΩ.m) |
|||
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C | |||||
| UNS S32205 / 2205 | 782 | 190 | 13.7 | 14.2 | - | 19 | - | 418 | 850 |
Mechanical Composition of ASTM A789 UNS S31803 Duplex Stainless Steel Tubes
| Grade | Tensile Strength (MPa) min |
Yield Strength 0.2% Proof (MPa) min |
Elongation (% in 50mm) min |
Hardness | |
| Rockwell C (HR C) | Brinell (HB) | ||||
| UNS S32205 / 2205 | 621 | 448 | 25 | 31 max | 293 max |
Chemical Composition of ASTM A789 UNS S31803 Duplex Stainless Steel Tubes
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 2205 (UNS S31803) | Min Max | - 0.030 | - 2.00 | - 1.00 | - 0.030 | - 0.020 | 21.0 - 23.0 | 2.5 - 3.5 | 4.5 - 6.5 | 0.08 - 0.20 |
| 2205 (UNS S32205) | Min Max | - 0.030 | - 2.00 | - 1.00 | - 0.030 | - 0.020 | 22.0 - 23.0 | 3.0 - 3.5 | 4.5 - 6.5 | 0.14 - 0.20 |
Here are some of the key advantages of using duplex S31803 tubes:
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Corrosion Resistance: Duplex S31803 tubes exhibit excellent resistance to corrosion in various environments, including chloride-containing and acidic environments, making them suitable for harsh industrial applications.
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High Strength: These tubes have higher strength compared to austenitic stainless steels, allowing for thinner wall thicknesses and lighter weight designs while maintaining structural integrity.
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Good Toughness: Duplex S31803 tubes offer good toughness, making them suitable for applications where impact resistance is important.
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Good Weldability: They have good weldability characteristics, which simplifies the fabrication process and reduces the risk of welding defects.
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High Temperature Resistance: Duplex S31803 tubes can withstand high temperatures, making them suitable for applications in elevated temperature environments.
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Cost-Effective: Despite their superior properties, duplex S31803 tubes are relatively cost-effective compared to other high-performance materials.
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Low Thermal Expansion: These tubes have low thermal expansion coefficients, which helps reduce the risk of thermal distortion in applications involving temperature fluctuations.
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Erosion Resistance: Duplex S31803 tubes offer good resistance to erosion and erosion-corrosion, making them suitable for applications where abrasive substances are present.
Applications
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Oil and Gas Industry
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Chemical Processing
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Desalination Plants
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Power Generation
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Heat Exchangers
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Pulp and Paper Industry
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Automotive Industry
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Construction
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