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Duplex Steel S32205 Pipe & Fittings, also known as Duplex 2205, is one of the most widely used grades in the duplex stainless steel family. It combines the beneficial properties of both austenitic and ferritic stainless steels, making it highly durable and reliable for industrial applications. With a balanced microstructure of approximately 50% austenite and 50% ferrite, this grade offers superior resistance to stress corrosion cracking and pitting compared to conventional stainless steels.
One of the key advantages of Duplex S32205 pipes and Fittingss is their excellent corrosion resistance, especially in chloride-containing environments. This makes them an ideal choice for industries exposed to seawater, brine, and aggressive chemical media. The alloy also provides outstanding resistance to intergranular corrosion, crevice corrosion, and general atmospheric corrosion, ensuring a long service life even in highly demanding conditions.
Duplex Steel S32205 pipes and fittings are widely recognized for their excellent combination of mechanical strength and corrosion resistance. This duplex stainless steel combines austenitic and ferritic microstructures, giving it enhanced toughness and durability. It is commonly used in industries such as oil and gas, chemical processing, marine, and desalination plants, where performance in aggressive environments is critical.
S32205 duplex stainless steel typically contains 22% chromium, 5–6% nickel, 3% molybdenum, and small amounts of nitrogen. This composition improves resistance to pitting, crevice corrosion, and stress corrosion cracking, particularly in chloride-rich environments. The balanced chemical makeup ensures both high mechanical strength and excellent corrosion resistance, making it suitable for demanding applications.
In terms of mechanical properties, S32205 Duplex Steel delivers high yield strength, almost double that of standard austenitic stainless steels like 304 and 316. This allows for reduced material thickness while maintaining the required strength, leading to cost savings in fabrication and construction. Additionally, it provides good toughness and weldability, making it suitable for complex engineering projects where both strength and formability are essential.
Duplex Steel S32205 pipes and Fittingss are widely used across multiple industries, including oil and gas, chemical processing, power generation, marine, desalination, and pulp & paper industries. They are employed in heat exchangers, pressure vessels, structural applications, pipelines, and offshore platforms where a combination of corrosion resistance and mechanical strength is vital. Their durability ensures reliability in aggressive and high-pressure environments.
Duplex S32205 pipes and fittings exhibit high tensile strength, generally around 650–750 MPa, with a yield strength of approximately 450–500 MPa. They offer elongation of 25–30%, providing flexibility and reliability under mechanical stress. The higher strength allows the use of thinner wall sections, reducing material costs while maintaining structural integrity in pipelines and pressure vessels.
S32205 is engineered to resist various forms of corrosion, including pitting, crevice, and stress corrosion cracking. The addition of molybdenum and nitrogen enhances performance in chloride-containing environments, making it ideal for seawater applications, chemical transport, and offshore structures. Its corrosion resistance ensures long-term durability and reduced maintenance requirements.
Specification Table
| Product Name | Duplex Steel S32205 Pipe & Fittings |
|---|---|
| Standard | ASTM A815 / ASME SA815, ASTM A182 / ASME SA182, ASTM A790 / ASME SA790 |
| Grade | UNS S32205 (Duplex 2205) |
| Size Range | Seamless: 1/2" to 8" NB Welded: 1/2" to 48" NB |
| Type | Seamless / Welded / Fabricated |
| Schedule | Sch 10, Sch 20, Sch 40, Sch 80, Sch 160, XXS |
| Form | Elbow, Tee, Reducer, Cap, Stub End, Cross, Pipe, Bend |
| End Connection | Butt Weld, Socket Weld, Threaded |
| Dimensions | ASME/ANSI B16.9, B16.28, MSS-SP-43 |
| Equivalent Grades |
UNS: S32205 / S31803 EN: 1.4462 Werkstoff Nr.: 1.4462 Trade Name: Duplex 2205 |
| Chemical Composition (%) | C ≤ 0.03, Mn ≤ 2.00, Si ≤ 1.00, P ≤ 0.03, S ≤ 0.02, Cr 21.0–23.0, Ni 4.5–6.5, Mo 2.5–3.5, N 0.14–0.20, Fe Balance |
| Mechanical Properties |
Tensile Strength: 620 MPa min Yield Strength: 450 MPa min Elongation: 25% min Hardness: Max 290 HB |
| Temperature Range | –50°C to 300°C (continuous service) |
| Corrosion Resistance | Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride environments |
| Applications | Oil & Gas, Petrochemical, Desalination Plants, Pulp & Paper, Marine, Chemical Processing Industries |
| Testing | PMI Test, Hardness Test, IGC Test, Flattening Test, Flaring Test, Mechanical Testing, NDT |
| Certification | EN 10204 3.1 / 3.2, NACE MR0175 |
Chemical Composition (Typical ranges for SSS32205)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Composition (% by weight) |
|---|---|
| Carbon (C) | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | 0.50 – 1.00 |
| Chromium (Cr) | 21.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Nitrogen (N) | 0.08 – 0.20 |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Yield Strength (0.2% offset) | ~450 MPa (65,000 psi) |
| Tensile Strength | ~620 – 720 MPa (90,000 – 104,000 psi) |
| Elongation at Break | ~25 – 35% |
| Hardness (Brinell) | ~280 – 310 HB |
| Impact Toughness (Charpy V-Notch) | ≥ 100 J at 20°C |
| Modulus of Elasticity | ~200 GPa (29,000 ksi) |
| Thermal Conductivity | ~15 W/m·K |
| Operating Temperature | Up to 300°C (572°F) |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | S32205 |
| AISI / ASTM | 2205 |
| EN (European) | 1.4462 |
| BS (British) | EN 1.4462 |
| DIN (German) | X2CrNiMoN22-5-3 |
| JIS (Japanese) | SUS329J4L |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Nominal Size (NPS) | Outside Diameter (OD) mm / inch | Wall Thickness (mm / inch) | Weight per Meter (kg/m) |
|---|---|---|---|
| 1/2" | 21.3 mm / 0.84" | 2.77 mm / 0.109" | 1.68 kg/m |
| 3/4" | 26.7 mm / 1.05" | 2.87 mm / 0.113" | 2.21 kg/m |
| 1" | 33.4 mm / 1.31" | 3.38 mm / 0.133" | 3.05 kg/m |
| 1 1/2" | 48.3 mm / 1.90" | 3.91 mm / 0.154" | 4.80 kg/m |
| 2" | 60.3 mm / 2.38" | 4.85 mm / 0.191" | 7.30 kg/m |
| 3" | 88.9 mm / 3.50" | 5.49 mm / 0.216" | 12.20 kg/m |
| 4" | 114.3 mm / 4.50" | 6.02 mm / 0.237" | 17.80 kg/m |
| 6" | 168.3 mm / 6.63" | 7.11 mm / 0.280" | 29.80 kg/m |
| 8" | 219.1 mm / 8.63" | 8.18 mm / 0.322" | 46.30 kg/m |
Types Of Pipe Fittingss and Tubes
Tube Unions
Bite Type Tube Fittings
Stainless Steel Pipe Fittings
Forged Fsitting
Fitting
Carbon Steel Butt Weld Pipe Fittings
Frequently Asked Questions (FAQ)
1. What is Duplex Steel S32205?
Duplex Steel S32205, also known as UNS S32205 or 2205, is a duplex stainless steel that combines austenitic and ferritic microstructures. It offers high strength and excellent corrosion resistance.
2. What are the common applications of S32205 pipes and fittings?
S32205 is commonly used in chemical processing, oil & gas, marine environments, desalination plants, pulp & paper industries, and petrochemical plants due to its durability and resistance to corrosion.
3. What standards does Duplex Steel S32205 conform to?
Typical standards include ASTM A789, ASTM A182, ASME B16.9, ASME B36.19, and EN 10222-5.
4. What are the advantages of using S32205 over regular stainless steel?
S32205 offers higher strength, excellent resistance to pitting and stress corrosion, and a favorable strength-to-weight ratio compared to standard austenitic stainless steels.
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