2205 Stainless Steel Pipe ASTM A790 Duplex Seamless Tube UNS S31803 / S32205 for Offshore Chemical
Price:
Negotiable (Request a Quote)
MOQ:
100kg
Delivery Time:
15-25days
Brand:
Baosteel，TISCO
Product Description
2205 Stainless Steel Pipe - UNS S31803 S32205 Seamless Tubing
The 2205 duplex stainless steel pipe combines the best properties of austenitic and ferritic stainless steels. It provides excellent resistance to chloride stress corrosion cracking (SCC), high thermal conductivity, and a low coefficient of thermal expansion.
Key Advantages vs Standard Austenitic Grades
- Higher strength - allows for reduced wall thickness and lighter weight structures
- Superior corrosion resistance - especially in chloride-containing environments
- Better cost efficiency - reduced material weight lowers overall project costs
At ZhongCheng, we supply 2205 stainless steel pipes in both seamless and welded (ERW/EFW) executions, manufactured according to ASTM A789 / A790 standards. Our duplex pipes are widely used in offshore platforms, heat exchangers, chemical tankers, and desalination plants.
Key Selling Points
- Dual-phase microstructure - high strength + good ductility
- Outstanding SCC resistance - ideal for chloride-rich environments
- High yield strength (≥450 MPa) - allows lightweight design
- Good weldability - with proper filler metal and heat input control
- Wide temperature range - from cryogenic to elevated temperatures
Specifications
| Parameter | Details |
|---|---|
| Standard | ASTM A789 / A790, ASME SA789 / SA790, ISO 13628 |
| Grade | UNS S31803, UNS S32205, 1.4462 |
| Type | Seamless / Welded (ERW / EFW / TIG) |
| Outer Diameter | 6 mm - 1219 mm (1/8″ - 48″) |
| Wall Thickness | 0.5 mm - 50 mm (SCH 10S - SCH 160) |
| Length | 3 m, 4 m, 6 m, or custom (max. 12 m) |
| Surface Finish | Pickled, Annealed, Bright Annealed, Polished |
| Ends | Plain ends, Beveled ends, Threaded, Grooved |
| Delivery Condition | Solution annealed + water quenched |
Chemical Composition
Compliant with ASTM A789 / A790 for UNS S32205.
| Element | Content (%) - UNS S31803 | Content (%) - UNS S32205 |
|---|---|---|
| Carbon (C) | ≤ 0.030 | ≤ 0.030 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.030 | ≤ 0.030 |
| Sulfur (S) | ≤ 0.020 | ≤ 0.020 |
| Chromium (Cr) | 21.0 - 23.0 | 22.0 - 23.0 |
| Nickel (Ni) | 4.50 - 6.50 | 4.50 - 6.50 |
| Molybdenum (Mo) | 2.50 - 3.50 | 3.00 - 3.50 |
| Nitrogen (N) | 0.08 - 0.20 | 0.14 - 0.20 |
| Iron (Fe) | Balance | Balance |
Note: UNS S32205 has tighter control on Cr, Mo, and N, offering enhanced corrosion resistance compared to S31803.
Mechanical Properties
| Property | Value (ASTM A790) |
|---|---|
| Tensile Strength | ≥ 620 MPa (90 ksi) |
| Yield Strength (0.2% offset) | ≥ 450 MPa (65 ksi) |
| Elongation (in 2″) | ≥ 25% |
| Hardness | ≤ 290 HB (≤ 30 HRC) |
| Density | 7.8 g/cm³ |
| Modulus of Elasticity | 200 GPa (29,000 ksi) |
Comparison vs 316L Stainless Steel
| Property | 2205 Duplex | 316L Austenitic |
|---|---|---|
| Yield Strength | ≥ 450 MPa | ≥ 170 MPa |
| Tensile Strength | ≥ 620 MPa | ≥ 485 MPa |
| Corrosion Resistance (PREN)* | ≥ 35 | ≈ 25 |
*PREN = Pitting Resistance Equivalent Number (Cr% + 3.3×Mo% + 16×N%)
Manufacturing Process
- Raw Material Inspection: Chemical composition verification via spectrometer.
- Pipe Forming:
- Seamless: Rotary piercing of billet + cold drawing / cold rolling
- Welded: Coil slitting + forming + TIG/Laser welding
- Welding (for welded pipe): Automated GTAW (TIG) with Ar + N₂ shielding to maintain duplex phase balance.
- Solution Annealing: Heat treatment at 1040 - 1120°C followed by water quenching to restore ferrite/austenite balance.
- Pickling & Passivation: Removal of oxide scale and enhancement of corrosion resistance.
- Non-Destructive Testing (NDT):
- Eddy current testing (ECT)
- Ultrasonic testing (UT)
- Hydrostatic testing
- Dimensional Inspection: OD, WT, and length tolerance verification.
- Marking & Packaging: Stencil marking per ASTM standard + wooden crate packaging.
Critical Note: Proper solution annealing and rapid quenching are essential for 2205 duplex pipe to prevent harmful intermetallic phases (sigma phase) that reduce corrosion resistance.
Applications
Thanks to its high strength and excellent chloride corrosion resistance, 2205 stainless steel pipe is widely used in:
| Industry | Specific Applications |
|---|---|
| Oil & Gas | Offshore platforms, subsea pipelines, flow lines, risers |
| Chemical Processing | Heat exchangers, pressure vessels, reactor pipes |
| Marine Engineering | Seawater cooling systems, desalination plants, and shipbuilding |
| Pulp & Paper | Digester vessels, bleaching systems |
| Food & Beverage | High-chloride processing equipment |
| Construction | Bridges, tunnels, and structural components in coastal areas |
| Pollution Control | Flue gas desulfurization (FGD) systems |
Common Use Cases
- Seawater reverse osmosis (SWRO) piping
- Chemical tanker cargo lines
- Geothermal well casings
- Hydropower penstocks
Frequently Asked Questions (FAQ)
Q1: What is the difference between 2205 and 316L stainless steel pipe?
A: 2205 duplex pipe offers approximately 2.5x higher yield strength and significantly better resistance to chloride stress corrosion cracking (SCC) compared to 316L. However, 316L is more ductile and easier to fabricate for simple applications.
Q2: Is 2205 stainless steel pipe magnetic?
A: Yes. Due to its ferrite phase (≈50%), 2205 duplex pipe is magnetic, unlike fully austenitic grades like 304 or 316.
Q3: Can 2205 duplex pipe be welded?
A: Yes, but it requires proper procedures. Use 2209 duplex filler metal, control interpass temperature (≤150°C), and maintain heat input (0.5 - 2.5 kJ/mm). Post-weld heat treatment is generally not required.
Q4: What is the difference between UNS S31803 and UNS S32205?
A: S32205 is a refined version with higher minimum contents of Cr (22.0% vs 21.0%), Mo (3.0% vs 2.5%), and N (0.14% vs 0.08%), providing enhanced corrosion resistance. Most modern specifications prefer S32205.
Q5: Does 2205 pipe require solution annealing after welding?
A: For most applications, no. As long as welding is performed with proper heat input and filler metal, the pipe can be used as-welded. For severely corrosive services, full solution annealing + water quenching may be required.
Q6: What is the PREN value of 2205?
A: The Pitting Resistance Equivalent Number (PREN) for 2205 is typically ≥ 35, compared to ≈25 for 316L. Higher PREN indicates better resistance to pitting corrosion.
Q7: Do you provide Mill Test Certificates (MTCs)?
A: Yes. All our 2205 stainless steel pipes are supplied with EN 10204 Type 3.1 or 3.2 Mill Test Certificates, including chemical composition, mechanical properties, and NDT reports.
Q8: What is the maximum operating temperature for 2205 pipe?
A: 2205 duplex pipe is suitable for continuous service from -50 °C to 300°C. Above 300°C, embrittlement may occur due to intermetallic phase formation.
Why Choose Our 2205 Stainless Steel Pipe?
| Advantage | Description |
|---|---|
| Strict Quality Control | 100% NDT testing (ET/UT) + hydrostatic testing |
| Full Traceability | Heat number stamped on each pipe + MTC provided |
| Competitive Pricing | Direct factory pricing - no middlemen |
| Short Lead Times | Large inventory of standard sizes ready to ship |
| Technical Support | Free welding and fabrication consultation |
Request a Free Quote for 2205 Stainless Steel Pipe
Send us your required: OD, Wall Thickness, Length, Quantity, and Standard (ASTM A789/A790).
We will reply within 12 hours with the best price and MTC sample.
Send us your required: OD, Wall Thickness, Length, Quantity, and Standard (ASTM A789/A790).
We will reply within 12 hours with the best price and MTC sample.
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Company
Shanxi Zhongcheng Metal Co., Ltd.
Location
Room 2, No. 221 Tianzhang Avenue, Fengdong New City, Xi'an, Shaanxi Province
Contact Person
Zhongcheng Metal