A789 S32750 Super Duplex Heat Exchanger Tube, Seamless And Solution Annealed, Eddy Current Test / Hydrostatic Tested
A789 S32750 Super Duplex Heat Exchanger Tube, Seamless And Solution Annealed, Eddy Current Test / Hydrostatic Tested
Overview
ASTM A789 S32750 (2507/1.4410) is a premium super duplex stainless steel seamless tube engineered specifically for heat exchangers, condensers and evaporators.
With a balanced 50% austenite and 50% ferrite microstructure, it features high mechanical strength, excellent chloride pitting, crevice and stress corrosion resistance, and superior thermal conductivity.
It is widely used in seawater desalination, offshore oil & gas, petrochemical, power plant and FGD systems for high-pressure, high-temperature and harsh corrosive working conditions.
Key Performance Features
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Double yield strength compared to 304/316L
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Outstanding resistance to chloride pitting, crevice corrosion & stress corrosion cracking
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Good thermal conductivity, higher than austenitic stainless steel
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Excellent erosion corrosion & fatigue resistance
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Suitable for high pressure & high temperature severe service
Mechanical Properties (Solution Annealed Condition)
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Tensile Strength: ≥790 MPa
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Yield Strength (0.2% Proof): ≥550 MPa
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Elongation: ≥15%
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Hardness: ≤310 HB / ≤32 HRC
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Microstructure: Balanced 50% Ferrite + 50% Austenite
Manufacturing & Heat Treatment
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Process: Seamless → Hot piercing → Cold drawn / Cold rolled
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Heat Treatment: Solution annealing at 1020–1100°C, water quenched
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Delivery Condition: Annealed, pickled & passivated, bright annealed optional
Available Size Range
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Outer Diameter: 6.0mm – 114.3mm
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Wall Thickness: 1.0mm – 8.0mm
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Standard Length: 6000mm / 12000mm
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Custom: U-bend heat exchanger tubes available
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Tolerance: Strict OD & WT tolerance per ASTM A789
Chemical Composition for A789 S32750 Super Duplex Heat Exchanger Tube
| Element | Content Limit |
|---|---|
| C | ≤0.03 |
| Mn | ≤1.20 |
| P | ≤0.035 |
| S | ≤0.020 |
| Si | ≤0.80 |
| Cr | 24.00–26.00 |
| Ni | 6.00–8.00 |
| Mo | 3.00–5.00 |
| N | 0.24–0.32 |
Key Performance Features
- Double yield strength compared to 304/316L
- Outstanding resistance to chloride pitting, crevice corrosion & stress corrosion cracking
- Good thermal conductivity, higher than austenitic stainless steel
- Excellent erosion corrosion & fatigue resistance
- Suitable for high pressure & high temperature severe service
Application
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Heat exchangers, condensers, evaporators
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Seawater cooling & desalination plants
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Offshore oil & gas platforms
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Petrochemical, chemical processing industry
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Power plant coastal cooling systems
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Flue gas desulfurization (FGD) systems
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.