ASTM A240 2205 (UNS S32205) Duplex Stainless Steel Pipe
ASTM A240 2205 (UNS S32205) Duplex Stainless Steel Pipe
Explore detailed material properties for ASTM A240 2205 (UNS S32205) duplex stainless steel pipe. Includes chemical composition, mechanical and physical properties, equivalent grades, and application guidance.
Welding (TIG, MIG, SAW, etc.), hot forming, cold forming, machining, cutting, heat treatment
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ASTM A240 2205 Duplex Stainless Steel Pipe Introduction
ASTM A240 2205 (UNS S32205) is a duplex stainless steel with a balanced ferrite-austenite microstructure, offering high strength, excellent corrosion resistance, and good weldability. Key features:
- High yield strength (≥450 MPa), nearly double that of conventional austenitic grades
- Excellent resistance to pitting (PREN ≥ 34), crevice corrosion, and stress corrosion cracking
- Good toughness at low temperatures
- Wide application in aggressive environments such as chemical, oil & gas, and marine sectors
This grade is commonly supplied as plate, sheet, strip, and pipe per ASTM A240/A790 standards.
ASTM A240 2205 Duplex Stainless Steel Pipe Chemical Composition
The chemical composition of 2205 (UNS S32205) as per ASTM A240 strictly controls the balance of alloying elements to achieve duplex microstructure and corrosion resistance. Key elements:
- Chromium (22-23%) provides passivity and pitting resistance.
- Molybdenum (3.0-3.5%) enhances pitting and crevice corrosion resistance.
- Nitrogen (0.14-0.20%) strengthens, stabilizes austenite, and improves pitting resistance.
- Nickel (4.5-6.5%) balances the ferrite/austenite ratio.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.030 | Lower to maintain intergranular corrosion resistance |
| Manganese (Mn) | ≤2.00 | Deoxidizer and austenite stabilizer |
| Silicon (Si) | ≤1.00 | Deoxidizer |
| Phosphorus (P) | ≤0.030 | Impurity control |
| Sulfur (S) | ≤0.020 | Impurity control |
| Chromium (Cr) | 22.0 - 23.0 | Primary element for corrosion resistance |
| Nickel (Ni) | 4.5 - 6.5 | Austenite former; controls phase balance |
| Molybdenum (Mo) | 3.0 - 3.5 | Enhances pitting resistance |
| Nitrogen (N) | 0.14 - 0.20 | Increases strength and pitting resistance |
| Iron (Fe) | Balance |
ASTM A240 2205 Duplex Stainless Steel Pipe Physical and Thermal Properties
These properties are typical for solution-annealed 2205 (S32205) and may vary slightly with processing conditions. They are not specification requirements but provide engineering guidance. Key points:
- Duplex stainless steel has lower thermal expansion than austenitic grades but higher than carbon steel.
- Thermal conductivity is higher than austenitic stainless steels, beneficial for heat exchanger applications.
| Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.8 | g/cm³ | 20°C |
| Elastic Modulus (E) | 200 | GPa | 20°C |
| Shear Modulus (G) | 77 | GPa | 20°C (typical) |
| Poisson's Ratio (ν) | 0.3 | — | 20°C |
| Thermal Expansion Coefficient (α) | 13.0 | x10⁻⁶/°C | 20-100°C |
| Thermal Expansion Coefficient (α) | 13.5 | x10⁻⁶/°C | 20-200°C |
| Thermal Expansion Coefficient (α) | 14.0 | x10⁻⁶/°C | 20-300°C |
| Thermal Conductivity (λ) | 19 | W/(m·K) | 100°C |
| Thermal Conductivity (λ) | 21 | W/(m·K) | 200°C |
| Thermal Conductivity (λ) | 23 | W/(m·K) | 300°C |
| Specific Heat Capacity (cp) | 500 | J/(kg·K) | 20°C |
| Electrical Resistivity (ρ_e) | 0.80 | µΩ·m | 20°C |
ASTM A240 2205 Duplex Stainless Steel Pipe Mechanical Properties
Mechanical properties are determined at room temperature on solution-annealed material. Values are minimum requirements unless noted. Note:
- Tensile test per ASTM A370.
- Elongation measured in 50 mm (2 in) gauge length.
- Hardness values are maximum limits.
- These properties apply to thicknesses commonly supplied; for very thick plates, properties may be slightly reduced.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | ≥655 | MPa | Room temperature |
| Tensile Strength (Rm) | ≥95 | ksi | Room temperature |
| Yield Strength (ReH, 0.2% offset) | ≥450 | MPa | Room temperature |
| Yield Strength (ReH, 0.2% offset) | ≥65 | ksi | Room temperature |
| Elongation (A, 50mm gauge) | ≥25 | % | Room temperature |
| Hardness | ≤293 | HBW | As annealed |
| Hardness | ≤31 | HRC | As annealed |
ASTM A240 2205 Duplex Stainless Steel Pipe Fully Equivalent Material Standards and Designations
| Country/Region | Standard | Designation | Remarks |
|---|---|---|---|
| USA | ASTM A240/A790 | UNS S32205 | Widely used duplex grade |
| European Union | EN 10088-2 / EN 10088-3 | 1.4462 / X2CrNiMoN22-5-3 | Identical composition to S32205 |
| Japan | JIS G 4304 / G 4303 | SUS 329J4L | Composition slightly broader, but commercially equivalent |
| China | GB/T 4237 / GB/T 20878 | 022Cr23Ni5Mo3N (S22053) | Matches S32205 specification |
| ISO | ISO 15510 | X2CrNiMoN22-5-3 | Identical to EN grade |
ASTM A240 2205 Duplex Stainless Steel Pipe Application Introduction
2205 duplex stainless steel is widely utilized in industries requiring high strength and excellent corrosion resistance, particularly against chloride stress corrosion cracking. Common applications include:
- Chemical and petrochemical processing equipment
- Oil and gas piping, separators, and wellhead components
- Marine and offshore structures, pump shafts, valves
- Pulp and paper digesters and bleach washers
- Desalination and water treatment plants
- Heat exchangers, pressure vessels, storage tanks
Product Applications: Pipes and tubes, Fittings and flanges, Plates and sheet for pressure vessels, Welded structures, Valves and pumps, Heat exchangers
Processed into products: Heat exchanger tubes, Piping systems for corrosive fluids, Reactor vessels, Seawater cooling piping, Flue gas desulfurization components, Propeller shafts, Wire lines for deep sea, Subsea manifold equipment, Cargo tanks for chemicals
Application industries: Chemical Processing, Oil & Gas, Marine & Offshore, Pulp & Paper, Desalination & Water Treatment, Energy, Construction
ASTM A240 2205 Duplex Stainless Steel Pipe Similar and Alternative Material Recommendations
| Country/Region | Standard | Designation | Remarks |
|---|---|---|---|
| USA | ASTM A240/A790 | UNS S31803 | Lower nitrogen version (N 0.08-0.20), slightly lower strength but similar corrosion; often dual certified with S32205. |
| USA | ASTM A240/A790 | UNS S32750 (Super Duplex 2507) | Higher alloy content (Cr 25, Mo 4, N 0.27) for superior corrosion resistance and strength. |
| USA | ASTM A240/A790 | UNS S32304 (Lean Duplex 2304) | Lean duplex with lower Ni and Mo, for less aggressive environments. |
| Worldwide | Various proprietary | Modified 2205 grades | Some proprietary modifications with higher N or optimized composition for improved weldability. |
Notes:
Welding: Use filler metals matching 2209 or equivalent over-alloyed wire to maintain pitting resistance. Control heat input and interpass temperature to avoid detrimental phase precipitation. Heat treatment: Solution annealing at 1020-1100°C followed by rapid cooling is essential to restore phase balance and corrosion resistance. Workability: Good hot and cold formability, but due to high strength, higher forming forces are required compared to austenitic grades. Corrosion: PREN (Pitting Resistance Equivalent Number) = %Cr + 3.3(%Mo) + 16(%N) ≈ 34-36, ensuring good resistance in chloride-containing environments.
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