In harsh, corrosive, and high-pressure environments, ordinary stainless steel often falls short which leads to frequent replacements, downtime, and rising costs. That’s where SS Duplex Welded Pipes shine. Combining the best of austenitic and ferritic stainless steels, Stainless steel duplex welded pipes deliver roughly double the yield strength of common grades like 304/316, exceptional resistance to pitting, crevice corrosion, and chloride stress corrosion cracking: all at a more economical price point.
The name “Duplex” refers to the unique two-phase microstructure of the metal. It consists of roughly equal proportions of Austenitic (300 series) and Ferritic (400 series) stainless steel. By balancing these two phases, Stainless steel duplex welded pipes deliver twice the strength of standard austenitic grades while providing significantly higher resistance to stress corrosion cracking and pitting.
Chemical Properties of SS Duplex Welded Pipes:
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤0.030 |
| Chromium (Cr) | 21.5-24.5 |
| Molybdenum (Mo) | – |
| Nickel (Ni) | 3.0-5.5 |
| Nitrogen (N) | 0.05-0.20 |
| Manganese (Mn) | ≤2.50 |
Mechanical Properties of Stainless Steel Duplex Welded Pipes:
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 600 min |
| Yield Strength 0.2% (MPa) | 400 min |
| Elongation (% in 50mm) | 25 min |
| Hardness (HB max) | 293 |
| Hardness (Rockwell B max) | 31 |
Physical Properties of Duplex Welded Pipes:
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ |
| Thermal Expansion (20-100°C) | 13 × 10⁻⁶/°C |
| Service Temperature Range | -50°C to +300°C |
| Microstructure | 50% ferrite/50% austenite |
Product Specifications:
| Parameter | Details |
|---|---|
| Steel Grade | SS Duplex |
| Unit Pipe Length | 6 meter |
| Outer Diameter | 6 mm to 2000 mm |
| Finish | Mirror Polish, Matt Polish, without polish |
| Diameter | 4 mm – 450 mm |
| Thickness | 1 mm to 25 mm |
| Min. Order Quantity | 200 Kilogram |
Applications: Where Duplex Welded Pipes Dominate
- Oil & Gas / Offshore: Subsea pipelines, risers, platforms—resisting seawater chlorides and H2S.
- Chemical & Petrochemical: Tanks, reactors, heat exchangers handling acids, chlorides, and high pressures.
- Desalination & Water Treatment: RO plants, brine lines—outperforming 316L in saline conditions.
- Pulp & Paper / Power: Bleaching equipment, flue gas desulfurization—handling corrosive slurries and gases.
- Marine & Architecture: Structural supports in coastal areas requiring long-term durability.
In Chennai’s industrial ecosystem, our Duplex Welded Pipes support refineries, chemical plants, and export projects with proven reliability.
Countries We Export
Macau, Philippines, Estonia, Slovakia, India, Switzerland, France, Gambia, United States, Nepal, Iran, Australia, Thailand, Gabon, Zimbabwe, Bangladesh, Angola, Lithuania, Kuwait, Kazakhstan, Trinidad & Tobago, Puerto Rico, Singapore, Mexico, Azerbaijan, Brazil, Bulgaria, United Arab Emirates, Tibet, Greece, South Africa, Afghanistan, Sri Lanka, Italy, China, Serbia, Turkey, Mexico, Bolivia, Peru, Chile, Belarus, Yemen, Namibia, Qatar, Algeria, Libya, Nigeria, Japan, Poland, Austria, Bhutan, Nigeria, Portugal, Czech Republic, Croatia, Jordan, Hungary, Finland, Pakistan, Spain, South Korea, Ecuador, Denmark, Canada, Kenya, Saudi Arabia, Vietnam, Sweden, Malaysia, Bahrain, Costa Rica, Venezuela, Israel, Netherlands, United Kingdom, New Zealand, Russia, Morocco, Poland, Indonesia, Hong Kong, Egypt, Oman, Norway, Chile, Iran, Lebanon, Taiwan, Ghana, Romania, Mongolia, Ukraine, Colombia, Tunisia, Ireland, Iraq, Belgium, Argentina, Germany.
Cities We Supply
Calgary, Al Jubail, Hong Kong, Bhopal, Jeddah, Toronto, Ulsan, Aberdeen, Thiruvananthapuram, Petaling Jaya, Nashik, Houston, Montreal, Cairo, Ernakulam, Atyrau, Karachi, Haryana, Istanbul, Jakarta, Sharjah, Nagpur, Dallas, Ranchi, Algiers, Doha, Santiago, Geoje-si, Singapore, Chennai, Jamshedpur, Perth, New Delhi, Tehran, Vadodara, New York, Caracas, Ahmedabad, Edmonton, Kanpur, Busan, Mumbai, Secunderabad, Bengaluru, Kolkata, Pimpri-Chinchwad, Manama, Vung Tau, Melbourne, Bangkok, Colombo, Ankara, Bogota, Sydney, Milan, Port-of-Spain, Abu Dhabi, Thane, Ahvaz, Visakhapatnam, Rajkot, Jaipur, Indore, Kuwait City, Gurgaon, Baroda, Navi Mumbai, La Victoria, Surat, Ludhiana, Lahore, Hanoi, Riyadh, Faridabad, Hyderabad, Coimbatore, Mexico City, Dubai, Al Khobar, Rio de Janeiro, Pune, Chiyoda, Moscow, Lagos, London, Madrid, Granada, Ho Chi Minh City, Brisbane, Chandigarh, Seoul, Courbevoie, Los Angeles, Gimhae-si, Dammam, Howrah, Muscat, Noida, Kuala Lumpur, Pondicherry, Tamil Nadu.
