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Duplex Steel S32205 Pipe & Tube, 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 tubes 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 tubes are engineered for demanding industrial environments where both strength and corrosion resistance are critical. As a duplex stainless steel, S32205 combines the properties of austenitic and ferritic steels, providing enhanced mechanical performance while resisting corrosion. These tubes and pipes are widely used in chemical, petrochemical, marine, and oil & gas industries.
S32205 features a balanced chemical composition that includes approximately 22% chromium, 5–6% nickel, 3% molybdenum, and small amounts of nitrogen. The nitrogen content enhances the material’s strength and improves resistance to pitting and crevice corrosion. This combination makes S32205 superior to conventional austenitic stainless steels in harsh chloride-rich environments.
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 tubes 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.
S32205 duplex steel pipes and tubes exhibit high tensile strength, typically in the range of 650–750 MPa, and yield strength around 450–500 MPa. They also provide an elongation of approximately 25–30%, ensuring flexibility under stress. This high strength-to-weight ratio allows engineers to design thinner-walled piping systems without compromising safety or durability.
The duplex microstructure of S32205 delivers excellent corrosion resistance. It performs exceptionally well against pitting, crevice corrosion, and stress corrosion cracking. The presence of molybdenum and nitrogen enhances its resistance to chloride-induced corrosion, making it suitable for seawater applications, desalination plants, and chemical transport pipelines.
Specification Table
| Property | Specification / Range |
|---|---|
| Grade | S32205 / 2205 Duplex Stainless Steel |
| Standard | ASTM A789, ASTM A790, ASTM A182 |
| Type | Seamless & Welded Pipe / Tube |
| Sizes | 1/2" to 48" (DN15 to DN1200) |
| Wall Thickness | Schedule 10 to Schedule XXS / Custom Thickness |
| Surface Finish | Mill Finish, Pickled & Passivated, Polished |
| Application | Oil & Gas, Chemical Processing, Pulp & Paper, Desalination, Marine & Offshore |
| Corrosion Resistance | Excellent resistance to pitting, crevice, and stress corrosion in chloride environments |
| Mechanical Strength | High strength: Yield ~450 MPa, Tensile ~620 MPa |
| Temperature Range | -50°C to 300°C (intermittent up to 315°C) |
Chemical Composition (Typical ranges for SSS32205)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.0 |
| Phosphorus (P) | ≤ 0.03 |
| Sulfur (S) | ≤ 0.02 |
| Silicon (Si) | 0.5 – 1.0 |
| Chromium (Cr) | 21 – 23 |
| Nickel (Ni) | 4.5 – 6.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Nitrogen (N) | 0.08 – 0.20 |
| Copper (Cu) | ≤ 0.5 |
Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 450 |
| Tensile Strength (MPa) | 620 – 850 |
| Elongation (%) | 25 – 35 |
| Hardness (HB) | ≤ 290 |
| Impact Strength (Charpy V, J) | ≥ 40 at -40°C |
| Modulus of Elasticity (GPa) | 200 |
| Poisson’s Ratio | 0.27 – 0.30 |
Equivalent Grades
| Standard / Specification | Equivalent Grade |
|---|---|
| UNS | S32205 |
| EN / DIN | 1.4462 / X2CrNiMoN22-5-3 |
| ASTM / ASME | A790 / A789 / A182 F51 |
| JIS | SUS 329J4L |
| GB / Chinese Standard | 06Cr22Ni5Mo3N |
| ISO | ISO 11960-2205 |
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 Pipe Size (NPS) | Outside Diameter (OD) mm | Wall Thickness (WT) mm | Weight per Meter (kg/m) |
|---|---|---|---|
| 1/2" | 21.3 | 2.77 | 1.65 |
| 3/4" | 26.7 | 2.87 | 2.21 |
| 1" | 33.4 | 3.38 | 3.01 |
| 2" | 60.3 | 3.91 | 6.35 |
| 3" | 88.9 | 4.85 | 11.5 |
| 4" | 114.3 | 6.02 | 17.5 |
| 6" | 168.3 | 7.11 | 31.2 |
| 8" | 219.1 | 8.18 | 50.1 |
| 10" | 273.0 | 9.27 | 74.5 |
| 12" | 323.9 | 10.97 | 102.5 |
Types Of Duplex Steel S32205 Pipe & Tubes
SS S32205 Seamless Pipe
SS S32205 Welded Pipe
SS S32205 ERW Pipe
SS S32205S EFW Pipe
Duplex Steel S32205S Seamless Tube
S32205H Duplex Steel Welded Tube
S32205 Duplex Steel Capillary Tube
S32205H Duplex Steel Heat Exchanger Tubes
Frequently Asked Questions (FAQ)
Q1: What is Duplex Steel S32205?
Duplex Steel S32205, also known as 2205, is a duplex stainless steel grade with a balanced microstructure of austenite and ferrite. It provides high strength and excellent resistance to pitting, crevice, and stress corrosion.
Q2: What are the common applications of S32205 pipes and tubes?
They are widely used in oil & gas, chemical processing, desalination, marine, pulp & paper, and power industries. Common applications include pipelines, pressure vessels, heat exchangers, and structural components in corrosive environments.
Q3: What types of S32205 pipes and tubes are available?
S32205 is available in seamless and welded forms with various sizes, wall thicknesses, and surface finishes such as mill finish, pickled & passivated, or polished.
Q4: What makes S32205 better than 304 or 316 stainless steel?
S32205 has nearly double the yield strength of 304/316, better resistance to chloride stress corrosion cracking, and higher pitting and crevice corrosion resistance, making it ideal for harsh environments.
Q5: Can Duplex S32205 be welded?
Yes, S32205 has good weldability. Proper welding techniques must be followed to maintain its duplex structure and corrosion resistance, typically using matching filler metals and controlled heat input.
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