ASTM A789 UNS S32205 Duplex Stainless Steel Heat Exchanger Tube Duplex 2205 Seamless Tube
ASTM A789 UNS S32205 / SAF 2205 Duplex Stainless Steel Seamless Tube Heat Exchanger Tube
Key Advantages of Duplex Steel S3205 for Heat Exchanger Tubes
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High Corrosion Resistance: PREN (Pitting Resistance Equivalent Number) = 33–35. Excellent resistance to chloride pitting, crevice corrosion, and stress corrosion cracking (SCC) – where 300-series austenitic steels often fail.
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High Strength: Allows for thinner tube walls, leading to:
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Reduced weight of the heat exchanger bundle.
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Improved heat transfer efficiency.
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Lower material cost per unit of strength.
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Thermal Conductivity: Higher than austenitic stainless steels (approx. 15 W/m·K vs. ~12 for 316), improving heat exchanger performance.
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Low Thermal Expansion: Closer to carbon steel, reducing thermal stress at tube-to-tubesheet joints.
Equivalent Grade of ASTM A789 UNS S32205 Duplex Stainless Steel Heat Exchanger Tube Duplex 2205 Seamless Tube
| GRADE | UNS | GB | JIS | ISO | DIN/EN | GOST | |
| ISC | NEW | ||||||
| 2205 | S32205 | S22253 | 022Cr22Ni5Mo3N | SUS329J3L | X2CrNiMoN22-5-3 | 1.4462 | 03Х22Н5АМ3 |
Chemical Composition of ASTM A789 UNS S32205 Duplex Stainless Steel Heat Exchanger Tube Duplex 2205 Seamless Tube
| Grade | C | Mn | P | S | Si | Cr | Ni | Mo | N | Cu |
| S32205 | 0.03 | 2.0 | 0.03 | 0.02 | 1.0 | 22.0–23.0 | 4.5–6.5 | 3.0–3.5 | 0.14–0.2 | — |
Mechanical Properties of ASTM A789 UNS S32205 Duplex Stainless Steel Heat Exchanger Tube Duplex 2205 Seamless Tube
| Grade | Condition | Tensile Strength Min, MPa (ksi) | Yield Strength Min, MPa (ksi) | Elongation Min, % | PREN |
| S32205 | Annealed | 655 (95) | 450 (65) | 25 | ≥34 |
Application
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Chemical Processing: Heat exchangers handling chlorides, organic acids, and caustic solutions.
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Oil & Gas: Shell and tube coolers, gas coolers, and process heaters (often used where H2S and chlorides are present).
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Desalination Plants: Brine heaters and condensers.
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Pulp & Paper: Digester heat exchangers.
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Flue Gas Desulfurization (FGD): Reheaters and scrubber exchangers.
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