ASTM A789 UNS S32205 Duplex Stainless Steel Seamless Pipe
ASTM A789 UNS S32205 duplex stainless steel seamless pipe is a high-performance pipe manufactured according to ASTM A789 / ASME SA789 standards. It is designed for heat exchangers, condensers, and general corrosion-resistant service.
UNS S32205, commonly known as Duplex Stainless Steel 2205, features a balanced microstructure of approximately 50% ferrite and 50% austenite, combining the advantages of both stainless steel structures.
Compared with standard austenitic stainless steels such as 304 and 316, ASTM A789 S32205 duplex pipes provide:
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Higher mechanical strength
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Superior resistance to pitting corrosion
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Excellent resistance to stress corrosion cracking
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Improved performance in chloride environments
These properties make duplex stainless steel pipes ideal for offshore oil & gas, chemical processing, desalination plants, and marine engineering systems.
ASTM A789 S32205 Pipe Specification
| Item | Specification |
|---|---|
| Standard | ASTM A789 / ASME SA789 |
| Material Grade | UNS S32205 (Duplex 2205) |
| Product Type | Seamless / Welded Pipe |
| Application | Heat Exchangers / Condensers |
| Size Range | 6 mm – 219 mm |
| Wall Thickness | 0.8 mm – 12 mm |
| Length | Up to 12 m or as required |
ASTM A789 covers seamless and welded ferritic/austenitic stainless steel tubing for corrosion-resistant service.
Chemical Composition of UNS S32205
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 22.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 |
| Molybdenum (Mo) | 3.0 – 3.5 |
| Nitrogen (N) | 0.14 – 0.20 |
| Carbon (C) | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.0 |
The high chromium, molybdenum, and nitrogen content provides excellent resistance to pitting and crevice corrosion in chloride-containing environments.
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 620 MPa |
| Yield Strength | ≥ 450 MPa |
| Elongation | ≥ 25% |
| Hardness | ≤ 290 HB |
Duplex stainless steel pipes provide approximately twice the yield strength of austenitic stainless steels, allowing thinner pipe walls and reduced system weight.
Heat Treatment
ASTM A789 S32205 pipes are supplied in solution annealed condition, followed by rapid quenching to achieve the proper duplex microstructure.
Typical heat treatment temperature:
1020°C – 1100°C
This ensures:
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Balanced ferrite/austenite microstructure
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Maximum corrosion resistance
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Stable mechanical properties
Corrosion Resistance
UNS S32205 duplex stainless steel offers excellent resistance to:
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Pitting corrosion
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Crevice corrosion
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Chloride stress corrosion cracking
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Seawater corrosion
These characteristics make ASTM A789 duplex pipes widely used in highly corrosive environments.
Applications of ASTM A789 S32205 Duplex Pipes
ASTM A789 duplex stainless steel pipes are widely used in industries including:
Offshore Oil & Gas
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Subsea pipelines
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Offshore platforms
Desalination Plants
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Seawater transport systems
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Reverse osmosis equipment
Chemical Processing
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Corrosion-resistant piping systems
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Industrial process pipelines
Power Generation
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Heat exchangers
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Condensers
Inspection and Testing
ASTM A789 UNS S32205 pipes undergo strict quality inspection, including:
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Chemical composition analysis
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Mechanical property testing
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Eddy current testing
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Hydrostatic testing
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Ultrasonic testing
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Dimensional inspection
All pipes can be supplied with EN 10204 3.1 Mill Test Certificate.
ASTM A789 Duplex Stainless Steel Pipe Supplier
We are a professional manufacturer and supplier of ASTM A789 UNS S32205 duplex stainless steel seamless pipes.
Our advantages include:
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Wide size range and custom production
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Strict quality control and inspection
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Competitive factory pricing
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Export-ready packaging for global delivery
Related Duplex Stainless Steel Pipes
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ASTM A789 S31803 Duplex Tube
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ASTM A789 Duplex Stainless Steel Heat Exchanger Tube
