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Duplex Steel 2205 (UNS S31803) Angle Channel is a high-performance structural alloy known for its exceptional strength and corrosion resistance. It contains a balanced microstructure of approximately equal parts austenite and ferrite, providing superior toughness and higher mechanical strength than standard stainless steels. This duplex stainless steel is ideal for applications where resistance to pitting, crevice corrosion, and stress corrosion cracking is essential. Its durability and long service life make it a preferred choice for industries that operate under harsh conditions.
The Duplex 2205 Angle Channel offers remarkable resistance to chloride environments, making it suitable for use in marine, offshore, and chemical process applications. The combination of chromium, molybdenum, and nitrogen enhances its corrosion resistance against chloride-induced stress cracking. Its excellent fatigue and impact strength allow it to perform efficiently in temperature variations and dynamic loading conditions. Due to its dual-phase structure, it maintains good weldability and formability, making fabrication and construction easier and more reliable.
In structural and industrial engineering, Duplex 2205 (UNS S31803) Angle Channels are used to provide strength and stability in frameworks, platforms, and support systems. They are also employed in heat exchangers, pressure vessels, bridges, and desalination plants. This material’s ability to maintain strength at both high and sub-zero temperatures makes it highly versatile. Engineers prefer Duplex 2205 because it delivers excellent mechanical performance with a reduced wall thickness, optimizing weight without compromising safety or integrity.
One of the most notable features of Duplex 2205 is its exceptional resistance to localized corrosion such as pitting and crevice attack. In environments containing chlorides, acids, or alkalis, this alloy performs significantly better than standard austenitic stainless steels like 304 or 316. The balanced composition of chromium (around 22%), molybdenum, and nitrogen contributes to this superior corrosion performance. These properties make the Duplex 2205 Angle Channel an ideal choice for environments exposed to seawater, brackish water, and chemical solutions.
The mechanical properties of Duplex 2205 (UNS S31803) are another reason for its popularity across multiple industries. It exhibits a yield strength roughly double that of 304 or 316 stainless steel, allowing designers to achieve strength with less material. This contributes to weight savings, cost efficiency, and enhanced structural integrity. It also retains excellent toughness, ensuring reliable performance even under cyclic loading and impact stress. The combination of strength and ductility enables safe use in demanding industrial conditions.
Fabrication of Duplex 2205 Angle Channels can be done through standard machining and welding methods. However, it requires slightly higher cutting forces compared to austenitic grades. Proper filler metals and post-weld cleaning are recommended to maintain corrosion resistance in welded zones. The material is compatible with TIG, MIG, and SMAW welding techniques. Once fabricated, these angle channels are used in process equipment, support frames, and structural reinforcements in refineries, power plants, and water treatment facilities.
Overall, Duplex Steel 2205 (UNS S31803) Angle Channel represents the ideal combination of strength, corrosion resistance, and economy. Its durability ensures extended service life with minimal maintenance requirements, especially in aggressive industrial and marine atmospheres. Whether for offshore oil rigs, chemical plants, or seawater pipelines, it provides a dependable and cost-effective solution. With its ability to withstand both mechanical and chemical stress, Duplex 2205 continues to be one of the most reliable materials for modern construction and industrial engineering applications.
Specification Table
| Specification | Details |
|---|---|
| Grade | Duplex Steel 2205 / UNS S31803 / UNS S32205 |
| Standard | ASTM A240, ASTM A276, ASTM A479, ASTM A484 / ASME SA240, SA276, SA479, SA484 |
| Form | Angle, Channel, Equal & Unequal Angle Bars, L-Shaped Sections, Custom Profiles |
| Finish | Hot Rolled, Cold Drawn, Pickled, Bright, Polished, 2B, BA, No.4, Mirror Finish |
| Length | 3 Meter, 6 Meter or Custom Cut Lengths |
| Size Range | 20mm × 20mm up to 200mm × 200mm (Equal / Unequal) or as per customer requirement |
| Thickness | 3mm to 20mm or as specified |
| Type | Hot Rolled / Cold Formed / Laser Cut Angle Channels |
| Surface Treatment | Annealed & Pickled, Polished, Sand Blasted, or Passivated |
| Applications | Marine Equipment, Chemical Plants, Oil & Gas Platforms, Desalination Units, Structural Frames |
Chemical Composition (Typical ranges for SSIS)
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) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| 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 | Metric Value | Imperial Value |
|---|---|---|
| Tensile Strength (Min) | 620 MPa | 90,000 psi |
| Yield Strength (0.2% Proof, Min) | 450 MPa | 65,000 psi |
| Elongation (in 50mm) | 25% (Minimum) | 25% (Minimum) |
| Hardness (Brinell, Max) | 290 HB | 290 HB |
| Impact Strength (Charpy V-Notch) | ≥ 100 J at Room Temperature | ≥ 74 ft·lb at Room Temperature |
| Modulus of Elasticity | 200 GPa | 29,000 ksi |
| Density | 7.80 g/cm³ | 0.282 lb/in³ |
Equivalent Grades
| Standard | Grade | UNS | Werkstoff Nr. | EN / DIN |
|---|---|---|---|---|
| ASTM / ASME | 2205 | S31803 / S32205 | 1.4462 | X2CrNiMoN22-5-3 |
| AFNOR (France) | Z2CND22-05Az | S31803 | 1.4462 | - |
| BS (United Kingdom) | 318S13 | S31803 | 1.4462 | - |
| JIS (Japan) | SUS 329J3L | S32205 | 1.4462 | - |
| GOST (Russia) | 08Х22Н6Т | - | - | - |
| ISO | 2205 | S31803 | 1.4462 | X2CrNiMoN22-5-3 |
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.
| Size (mm x mm x mm) | Thickness (mm) | Approx. Weight (kg/m) | Approx. Weight (kg/ft) |
|---|---|---|---|
| 20 x 20 x 3 | 3 | 0.88 | 0.27 |
| 25 x 25 x 3 | 3 | 1.10 | 0.34 |
| 30 x 30 x 4 | 4 | 1.62 | 0.49 |
| 40 x 40 x 4 | 4 | 2.20 | 0.67 |
| 50 x 50 x 5 | 5 | 3.35 | 1.02 |
| 60 x 60 x 6 | 6 | 4.80 | 1.46 |
| 65 x 65 x 6 | 6 | 5.30 | 1.62 |
| 75 x 75 x 8 | 8 | 7.90 | 2.41 |
| 90 x 90 x 8 | 8 | 9.60 | 2.93 |
| 100 x 100 x 10 | 10 | 12.10 | 3.69 |
| 130 x 130 x 12 | 12 | 18.40 | 5.60 |
| 150 x 150 x 15 | 15 | 26.60 | 8.10 |
| 200 x 200 x 20 | 20 | 47.40 | 14.45 |
Types Of Duplex Steel 2205 UNS S31803 Angle & Channel
Stainless Steel Angle & Channel
Monel 400 Angle & Channel
Inconel 600 Angle & Channel
Hastelloy Angle & Channel
Super Duplex Angle & Channel
Duplex Angle & Channel
Nickel Angle & Channel
Monel K500 Angle & Channel
Frequently Asked Questions (FAQ)
What is Duplex Steel 2205 (UNS S31803) Angle Channel?
Duplex Steel 2205 (UNS S31803) Angle Channel is a stainless steel structural shape with a dual-phase microstructure of austenite and ferrite. It offers higher strength and excellent corrosion resistance compared to conventional austenitic stainless steels. This makes it suitable for demanding environments like marine, offshore, and chemical processing applications.
What are the key features of Duplex 2205 Angle Channel?
The Duplex 2205 Angle Channel provides outstanding resistance to chloride stress corrosion cracking, pitting, and crevice corrosion. It also offers double the yield strength of 304/316 stainless steel, excellent weldability, and good fatigue strength. Its durability and cost-effectiveness make it a preferred choice for structural and industrial applications.
Where is Duplex Steel 2205 Angle Channel commonly used?
Duplex 2205 Angle Channels are widely used in chemical plants, marine engineering, desalination units, pulp & paper industries, oil and gas refineries, pressure vessels, and heat exchangers. They are also used in offshore platforms, bridges, and load-bearing structural frameworks where high strength and corrosion resistance are essential.
What standards and specifications cover Duplex 2205 Angle Channel?
Duplex Steel 2205 (UNS S31803/S32205) Angle Channels are manufactured according to ASTM A240, ASTM A276, ASTM A479, and ASTM A484 standards. Equivalent standards include ASME SA240, EN 1.4462, and JIS SUS 329J3L. These standards define its chemical composition, mechanical properties, and dimensional tolerances for industrial applications.
How does Duplex 2205 compare to 316 stainless steel?
Duplex 2205 offers roughly twice the yield strength of 316 stainless steel and superior resistance to stress corrosion cracking and pitting in chloride environments. While 316 is easier to fabricate, Duplex 2205 performs better in aggressive or high-pressure environments, offering longer service life and reduced maintenance requirements.
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