ASTM A789 S32750 Super Duplex Stainless Steel Seamless Tube For Heat Exchanger
ASTM A789 S32750 Super Duplex Stainless Steel Seamless Tube For Heat Exchanger
Description:
This seamless tube is made from ASTM A789 S32750 Super Duplex Stainless Steel, designed for high-strength, corrosion-resistant heat exchanger applications. It combines the properties of austenitic and ferritic stainless steels, offering excellent resistance to chloride stress corrosion cracking, pitting, and crevice corrosion, especially in marine and chemical process environments.
Chemical Composition (S32750):
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 24.0 – 26.0 |
| Nickel (Ni) | 6.0 – 8.0 |
| Molybdenum (Mo) | 3.0 – 5.0 |
| Nitrogen (N) | 0.24 – 0.32 |
| Manganese (Mn) | ≤ 1.2 |
| Carbon (C) | ≤ 0.030 |
| Silicon (Si) | ≤ 0.80 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.020 |
| Iron (Fe) | Balance |
Mechanical Properties:
| Property | Typical Value |
|---|---|
| Tensile Strength | ≥ 795 MPa |
| Yield Strength (0.2%) | ≥ 550 MPa |
| Elongation | ≥ 15% |
| Hardness (HRB) | ≤ 100 |
Advantages:
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Superior Corrosion Resistance: Excellent in brine, seawater, and aggressive chemical media.
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High Strength: Double the yield strength of austenitic stainless steels (e.g., 316L).
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Stress Corrosion Resistance: Especially effective against chloride-induced cracking.
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Long Service Life: Ideal for harsh and corrosive operating environments.
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Low Thermal Expansion: Reduces stress during temperature fluctuations in heat exchangers.
Applications:
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Heat Exchangers in:
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Desalination plants
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Offshore oil & gas platforms
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Marine cooling systems
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Chemical and petrochemical processing
-
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Condenser and evaporator tubes
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Seawater systems in refineries and power stations
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High-pressure and high-temperature environment
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