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Duplex Steel S31803 Pipe & Tube, also referred to as Duplex 2205, is a widely used grade of duplex stainless steel that combines the excellent qualities of both austenitic and ferritic structures. It offers superior strength and outstanding resistance to stress corrosion cracking, pitting, and crevice corrosion compared to conventional stainless steels. This unique balance makes it a preferred material in highly demanding industrial applications.
One of the primary benefits of Duplex Steel S31803 pipes and tubes is their excellent resistance to chloride environments, making them highly reliable for use in marine, offshore, and chemical industries. Their dual-phase microstructure provides approximately twice the yield strength of standard austenitic stainless steels, which allows for thinner sections and lighter construction without compromising performance.
Duplex Steel S31803 pipes and tubes are engineered for applications requiring high strength and exceptional corrosion resistance. They are a type of stainless steel that combines the advantageous properties of both austenitic and ferritic stainless steels, offering superior performance in harsh environments. The duplex structure provides a balance between mechanical strength and corrosion resistance, making it a preferred choice for industries such as chemical processing, oil and gas, and marine applications.
S31803 duplex steel contains roughly 22% chromium, 5–6% nickel, 3% molybdenum, and low carbon content. It also includes small amounts of nitrogen, which enhances the alloy's mechanical properties and pitting resistance. This unique chemical composition contributes to excellent resistance against stress corrosion cracking, chloride pitting, and crevice corrosion, outperforming many conventional stainless steels in aggressive environments.
These pipes and tubes are extensively utilized in industries such as oil & gas exploration, desalination plants, chemical processing, petrochemicals, and power generation. They are also commonly used in heat exchangers, pressure vessels, and structural applications where both corrosion resistance and mechanical strength are critical requirements.
Manufactured in both seamless and welded forms, Duplex S31803 Pipe & Tube comes in a wide range of sizes, dimensions, and surface finishes. They can be customized to meet specific project requirements and are available in annealed, pickled, or polished conditions. Their adaptability and durability ensure long service life, reducing maintenance costs for industries operating in aggressive environments.
Duplex S31803 pipes and tubes are renowned for their high tensile strength, typically around 620–720 MPa, and a yield strength of approximately 450 MPa. They possess good elongation, usually around 25–35%, which ensures durability under mechanical stress. The high strength-to-weight ratio allows for the use of thinner walls while maintaining structural integrity, which is advantageous in pipeline installations and high-pressure systems.
The duplex microstructure provides superior resistance to various forms of corrosion, including pitting, crevice, and stress corrosion cracking. The addition of molybdenum and nitrogen enhances performance in chloride-rich environments, making S31803 pipes and tubes suitable for seawater applications, desalination plants, and chemical processing units. Its ability to withstand harsh chemical exposure ensures long-term reliability and reduced maintenance costs.
Specification Table
| Specification | Details |
|---|---|
| Grade | Duplex Steel S31803 / 2205 |
| UNS Number | S31803 / S32205 |
| Standards | ASTM A790 / A928, ASME SA790 / SA928 |
| Pipe Types | Seamless, Welded, Fabricated, ERW |
| Size Range | 1/2” NB to 24” NB (Nominal Bore) |
| Thickness | Sch 10s, Sch 40s, Sch 80s, Sch XXS, Custom |
| Form | Round, Square, Rectangular, Hydraulic |
| End Types | Plain End, Beveled End, Threaded |
| Surface Finish | Annealed, Pickled, Polished |
| Application | Oil & Gas, Chemical Processing, Desalination, Power Plants, Marine |
Chemical Composition (Typical ranges for SSS31803)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Percentage (%) |
|---|---|
| Chromium (Cr) | 21.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Carbon (C) | ≤ 0.03 |
| Phosphorus (P) | ≤ 0.03 |
| Sulfur (S) | ≤ 0.02 |
| Nitrogen (N) | 0.08 – 0.20 |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 620 min | MPa |
| Yield Strength (0.2% Offset) | 450 min | MPa |
| Elongation | 25 min | % |
| Hardness (Brinell) | ≤ 290 | HB |
| Impact Toughness | ≥ 100 | J (at room temperature) |
| Density | 7.8 | g/cm³ |
| Melting Point | 1350 – 1450 | °C |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | S31803 / S32205 |
| WERKSTOFF NR. | 1.4462 |
| EN | X2CrNiMoN22-5-3 |
| AFNOR | Z3CND22-05Az |
| BS | 318S13 |
| JIS | SUS 329J3L |
| GOST | 08Х22Н6Т |
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 (Sch 40) mm | Weight (kg/m) |
|---|---|---|---|
| 1/2" | 21.3 | 2.77 | 1.27 |
| 3/4" | 26.7 | 2.87 | 1.68 |
| 1" | 33.4 | 3.38 | 2.47 |
| 1 1/2" | 48.3 | 3.68 | 3.63 |
| 2" | 60.3 | 3.91 | 5.44 |
| 3" | 88.9 | 5.49 | 11.28 |
| 4" | 114.3 | 6.02 | 15.42 |
| 6" | 168.3 | 7.11 | 28.26 |
| 8" | 219.1 | 8.18 | 43.39 |
| 10" | 273.1 | 9.27 | 68.03 |
| 12" | 323.9 | 9.53 | 84.74 |
Types Of Duplex Steel S31803 Pipe & Tubes and Tubes
SS S31803 Seamless Pipe
SS S31803 Welded Pipe
SS S31803 ERW Pipe
SS S31803S EFW Pipe
Duplex Steel S31803S Seamless Tube
S31803H Duplex Steel Welded Tube
S31803 Duplex Steel Capillary Tube
S31803H Duplex Steel Heat Exchanger Tubes
Frequently Asked Questions (FAQ)
Q1: What is Duplex Steel S31803?
A1: Duplex Steel S31803, also known as Duplex 2205, is a duplex stainless steel grade that combines the properties of both austenitic and ferritic stainless steels. It offers excellent corrosion resistance and high strength, making it suitable for aggressive environments.
Q2: What are the key advantages of Duplex Steel S31803 pipes and tubes?
A2: The main advantages include superior resistance to pitting and crevice corrosion, high strength (twice that of conventional stainless steel), excellent fatigue resistance, and good weldability.
Q3: In which industries are Duplex Steel S31803 pipes & tubes commonly used?
A3: They are widely used in oil & gas, chemical processing, desalination plants, power generation, marine applications, and heat exchangers where high strength and corrosion resistance are essential.
Q4: What forms and sizes are available for Duplex Steel S31803 pipes and tubes?
A4: They are available in seamless, welded, ERW, and fabricated forms, with a wide range of sizes and thicknesses (Sch 10s to Sch XXS). Custom dimensions can also be provided based on project requirements.
Q5: How does Duplex S31803 differ from Duplex S32205?
A5: Both are very similar, but UNS S32205 has slightly tighter chemical composition limits, offering improved corrosion resistance. In most cases, S32205 can be used as a replacement for S31803.
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