Duplex Steel Pipe & Tube
Duplex Steel Pipe & Tube
Duplex Steel Pipes & Tubes are made from a combination of ferritic and austenitic stainless steel, which gives them exceptional strength and resistance to corrosion. The duplex structure provides higher mechanical strength compared to regular stainless steel while maintaining excellent resistance to pitting, stress corrosion, and crevice corrosion. These materials are ideal for use in harsh environments such as chemical plants, marine applications, and pressure vessels. Duplex Steel is available in grades like 2205, 2507, and 31803, and is used extensively in industries such as oil & gas, petrochemical, desalination, and power generation.
Duplex Steel Pipes & Tubes are highly favored in industries that demand both high strength and resistance to corrosion, particularly in applications exposed to aggressive environments such as marine, chemical, and oil & gas sectors. The unique microstructure of duplex steel (a mix of ferrite and austenite) enables superior resistance to stress corrosion cracking, making it ideal for pipelines and heat exchangers where high pressure and temperature are factors. With excellent weldability and a cost-effective solution for corrosion-resistant piping systems, duplex steel has become the material of choice for numerous critical industrial applications worldwide.
Specification Table
| Specification | Grade | Size Range | Wall Thickness | Standard |
|---|---|---|---|---|
| ASTM A790 | Duplex 2205 | 1/2" to 24" | Sch 5S to Sch 160 | ASME, ANSI, ASTM |
| ASTM A312 | Duplex 2507 | 1/2" to 36" | Sch 10S to Sch 160 | ISO, EN, ASTM |
| ASTM A276 | Duplex 31803 | 1/8" to 4" | Sch 5S, Sch 40S, Sch 80S | ASTM, ASME |
| ASTM A790 | Duplex 2205 | 1" to 12" | Sch 40S, Sch 80S | ASME, ANSI |
Grade Comparison Table
| Grade | Composition | Common Applications | Corrosion Resistance |
|---|---|---|---|
| Duplex 2205 | 22% Cr, 3% Mo, 5% Ni | Offshore, chemical plants, marine environments | Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking |
| Duplex 2507 | 25% Cr, 7% Ni, 4% Mo | High-strength applications, seawater desalination, petrochemical | Superior resistance to chloride stress corrosion cracking, pitting, and crevice corrosion |
| Duplex 31803 | 22% Cr, 3% Mo, 4.5% Ni | Heat exchangers, power generation, pressure vessels | Resistant to chloride-induced stress corrosion and general corrosion |
Client Comments
-
Ravi Kumar
We procured Duplex 2205 seamless tubes from Stellirox Tubular LLP for a desalination project. The tubes exhibited excellent resistance to chloride stress corrosion cracking and showed high strength under pressure. The delivery was timely and the quality exceeded expectations.
-
Linda Morgan
We used Duplex Steel UNS S31803 pipes supplied by Stellirox Tubular LLP in our offshore piping system. The pipes handled harsh marine conditions effectively with no sign of pitting or corrosion. Truly durable material and excellent surface finish.
-
Ahmed Siddiqui
Our chemical plant installed Duplex Steel 2205 tubes from Stellirox Tubular LLP in the heat recovery system. The tubes demonstrated outstanding resistance to chemical corrosion and provided long service life. We are very satisfied with their technical assistance.
-
Emma Rodriguez
We purchased Duplex Steel 2205 welded pipes from Stellirox Tubular LLP for our paper mill system. The pipes were precisely fabricated, and their dual-phase structure gave excellent toughness and corrosion resistance. Their after-sales support is commendable.
-
Suresh Iyer
We regularly procure Duplex Steel pipes and tubes from Stellirox Tubular LLP for our pressure vessel applications. The mechanical strength and weld quality are consistently reliable. Definitely a trusted supplier for duplex materials.
Key Features- High Strength: Duplex steels offer higher yield and tensile strength compared to conventional stainless steels.
- Superior Corrosion Resistance: Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride environments.
- Good Weldability: Can be easily welded using common welding techniques without compromising strength.
- Improved Fatigue Strength: Ideal for high-pressure and fluctuating stress environments.
- Longer Lifespan: Duplex stainless steel offers a longer service life in challenging environments, reducing maintenance costs.
- Cost-Effective: Although initially more expensive than standard stainless steel, its durability and strength offer long-term cost savings.