Product Overview – Duplex Steel S31803 Seamless Pipes
Duplex Steel S31803 seamless pipes are manufactured from duplex stainless steel that combines the advantages of both austenitic and ferritic stainless steel structures. This dual-phase microstructure provides excellent mechanical strength along with high corrosion resistance.
UNS S31803, commonly referred to as Duplex 2205,offers significantly higher strength compared to standard austenitic stainless steels such as 304 and 316. It also provides improved resistance to chloride-induced stress corrosion cracking, making it ideal for harsh industrial environments.
The seamless manufacturing process ensures superior structural integrity and consistent wall thickness, which allows the pipes to handle high pressure, aggressive chemicals, and extreme operational conditions.
Due to their exceptional durability and corrosion resistance, Duplex Steel S31803 seamless pipes are widely used in oil and gas pipelines, offshore platforms, chemical processing equipment, heat exchangers, and desalination plants.
Standard & International Identification - Duplex Steel S31803 Seamless Pipes
Technical Specifications – Duplex S31803 Seamless Pipes
| Pipe Type: | Seamless Duplex Stainless Steel Pipes |
| Manufacturing Process: | Hot Piercing → Cold Drawing → Solution Annealing → Pickling & Passivation |
| Outer Diameter: | 6 mm to 610 mm |
| Wall Thickness: | 0.5 mm to 50 mm |
| Length Options: | Single Random Length/ Double Random Length/ Custom Cut Length |
| Surface Finish: | Bright Annealed / Pickled & Annealed / Polished Finish Available |
| Testing & Inspection: | Hydrostatic Test,Ultrasonic Testing, PMI,Dimensional Inspection |
| Certification : | EN 10204 3.1 / 3.2 MTC |
Third Party Inspection Available
All specifications are in accordance of ASTM A269 / ASME SA269 standards. Mechanical and chemical values are as per standard limits. Mill Test Certificates (MTC) available upon request.
Chemical Composition – Duplex Steel S31803
(As per ASTM specification)
| Element | Max (%) |
|---|---|
| Carbon (C): | 0.03% |
| Chromium (Cr): | 21 – 23% |
| Nickel (Ni): | 4.5 – 6.5% |
| Molybdenum (Mo): | 2.5 – 3.5% |
| Nitrogen (N): | 0.08 – 0.20% |
| Manganese (Mn): | Max 2% |
| Silicon (Si): | Max 1% |
| Iron : | Balance |
Note: This balanced composition provides both high strength and corrosion resistance.
Mechanical Properties – Duplex S31803 Pipes
| Property | Minimum Value |
|---|---|
| Tensile Strength | 620 MPa |
| Yield Strength | 450 MPa |
| Elongation | 25% |
Duplex S31803 pipes offer almost twice the strength of conventional stainless steels, making them ideal for heavy-duty industrial piping systems.
Corrosion Resistance of Duplex Steel S31803 Pipes
Duplex S31803 seamless pipes provide excellent corrosion resistance in challenging environments.
mportant corrosion resistance advantages include:
Because of these characteristics, Duplex steel pipes are commonly used in marine and offshore engineering systems.
Major Industrial Applications of Duplex Steel S31803 seamless pipes
- Duplex Steel S31803 seamless pipes are widely used in:
- 🔸Oil and Gas Industry
- 🔸Offshore Platforms
- 🔸Chemical Processing Plants
- 🔸Desalination Plants
- 🔸Heat Exchanger Equipment
- 🔸Marine Engineering Systems
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