Duplex Steel 2205/S31803 Pipe
Duplex Steel 2205 (UNS S31803) is a two-phase, ferritic-austenitic stainless steel that provides superior corrosion resistance and high strength compared to conventional stainless steels. This grade is widely used in aggressive environments, including chemical processing, marine applications, and oil & gas industries, due to its excellent mechanical properties and resistance to pitting and stress corrosion cracking.
Key Features of Duplex Steel 2205/S31803 Pipe
High Strength and Durability:
Duplex 2205 pipes offer almost twice the yield strength of standard austenitic stainless steels like 304 and 316, making them ideal for high-pressure applications. Their robust mechanical properties ensure long-term performance in demanding industrial environments.
Superior Corrosion Resistance:
With high chromium (22%) and molybdenum (3%) content, Duplex 2205 provides excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. This makes it particularly suitable for offshore platforms, chemical processing plants, and marine structures.
Excellent Weldability and Formability:
Duplex Steel 2205 can be easily welded and fabricated using standard techniques, making it highly versatile for various piping applications. Proper post-weld heat treatment enhances its strength and prevents intermetallic phase precipitation.
Improved Fatigue and Erosion Resistance:
Compared to austenitic stainless steels, Duplex 2205 has enhanced resistance to erosion and fatigue, making it ideal for applications involving dynamic stress, fluctuating temperatures, and abrasive environments.
Chemical Composition
Element | Composition (%) |
Chromium (Cr) | 21.0 – 23.0 |
Nickel (Ni) | 4.5 – 6.5 |
Molybdenum (Mo) | 2.5 – 3.5 |
Nitrogen (N) | 0.08 – 0.20 |
Manganese (Mn) | 2.0 max |
Carbon (C) | 0.03 max |
Silicon (Si) | 1.0 max |
Phosphorus (P) | 0.03 max |
Sulfur (S) | 0.02 max |
Mechanical Properties
Property | Value |
Tensile Strength | 620 MPa min |
Yield Strength | 450 MPa min |
Elongation | 25% min |
Hardness | 293 HB max |
Manufacturing Process
Duplex Steel 2205/S31803 pipes are manufactured using advanced metallurgical processes to ensure high quality and reliability. The production process includes:
- Billet Selection: High-quality raw materials are chosen.
- Hot Extrusion or Cold Drawing: Pipes are shaped to the required dimensions.
- Solution Annealing: Heat treatment enhances corrosion resistance and mechanical strength.
- Pickling and Passivation: Improves surface finish and removes scale or contaminants.
- Quality Testing: Pipes undergo rigorous testing to meet industry standards.
Common Applications
Oil & Gas Industry:
Duplex 2205 pipes are widely used in offshore drilling rigs, pipelines, and refineries due to their ability to withstand harsh environments and resist chloride-induced stress corrosion cracking.
Chemical Processing Plants:
The superior resistance to corrosive chemicals, acids, and high temperatures makes these pipes suitable for chemical reactors, storage tanks, and piping systems.
Marine and Shipbuilding:
Duplex 2205 pipes offer exceptional resistance to seawater corrosion, making them ideal for ship structures, heat exchangers, and ballast water systems.
Power Plants:
Used in high-pressure steam and water pipelines, these pipes enhance operational safety and efficiency in thermal and nuclear power plants.
Food and Beverage Industry:
The non-contaminating properties of Duplex Steel 2205 make it a preferred choice for processing equipment, piping, and storage tanks in the food and beverage sector.
Available Sizes and Dimensions:
Duplex Steel 2205/S31803 pipes are available in a variety of sizes, thicknesses, and schedules to meet industry requirements.
Pipe Size (NPS) | Wall Thickness (Sch 40) | Wall Thickness (Sch 80) |
1/2″ | 0.109″ | 0.147″ |
3/4″ | 0.113″ | 0.154″ |
1″ | 0.133″ | 0.179″ |
2″ | 0.154″ | 0.218″ |
4″ | 0.237″ | 0.337″ |
Testing and Quality Standards
To ensure superior quality, Duplex Steel 2205/S31803 pipes undergo strict testing and inspection processes, including:
- Hydrostatic Testing: Verifies pressure-handling capabilities.
- Non-Destructive Testing (NDT): Includes ultrasonic, radiographic, and eddy current tests.
- Chemical Analysis: Ensures compliance with ASTM and other international standards.
- Mechanical Testing: Checks tensile strength, yield strength, and elongation.
Surface Finish and Coatings
To enhance performance and durability, these pipes can be provided with various surface treatments:
- Pickled and Passivated (Standard finish)
- Electropolished Finish for improved corrosion resistance
- Epoxy Coating for added protection in harsh environments
- Galvanization for enhanced longevity
Quality Assurance & Packaging
At Riyaarth Overseas, we ensure the highest quality standards for Duplex Steel 2205/S31803 pipes, providing reliable and high-performance piping solutions for critical industries.
Certifications & Standards:
- Compliant with ASTM, ASME, ISO, and API standards.
- Meets stringent industry regulations for high-pressure and high-temperature applications.
Packaging:
Our pipes are securely packaged to prevent damage during transit. Each pipe is labeled and wrapped in protective materials to ensure safe delivery and easy identification.
Get high-quality Duplex Steel 2205/S31803 pipes from a trusted supplier. Contact us today for customized piping solutions tailored to your industry needs!
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Industry We Serve
- Oil & Gas industries
- Chemical process industries
- Pump and valve in high pressure component
- Food industries
- Pulp and paper industry
- Aerospace industry
- Power plant
- Mechanical component
- Sugar industry
- Cement industry