ASTM A790 UNS S31803 Duplex Stainless Steel Tubes For Chemical Plants
Jan 30, 2026
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Are you looking for high-performance duplex stainless steel tubes for industrial pipelines in Egypt?We recently supplied ASTM A790 UNS S31803 duplex stainless steel tubes in diameters of 8" and 10", SCH 80S, for a chemical processing project in Egypt. The project required superior corrosion resistance, high strength, and compliance with ASTM standards for long-term service in harsh environments.
🔹Customer Background
Project Location: Egypt
Industry: Chemical processing / Industrial piping
Material Required: ASTM A790 UNS S31803 duplex stainless steel tubes
Quantity: 26 pieces
Application: High-pressure pipelines handling corrosive chemicals
The client was looking for a trusted duplex stainless steel supplier capable of delivering high-quality ASTM A790 tubes with full traceability and compliance with international standards.
🔹Project Requirements & Challenges
Pipe Diameters: 8" and 10"
Schedule: SCH 80S
Material: Duplex stainless steel UNS S31803
Core Requirements:
Excellent corrosion resistance in chloride-containing and chemical environments
High mechanical strength and toughness for pressurized pipelines
Compliance with ASTM A790 standards for duplex stainless steel
Accurate dimensions and wall thickness for seamless installation
Previous pipelines in similar projects suffered stress corrosion cracking and high maintenance costs, making duplex stainless steel a preferred solution.
🔹Our Solution
We supplied ASTM A790 UNS S31803 duplex stainless steel tubes with the following specifications:
| Parameter | Specification |
|---|---|
| Standard | ASTM A790 / ASME SA790 |
| Material Grade | UNS S31803 Duplex Stainless Steel |
| Diameters | 8" and 10" |
| Schedule | SCH 80S |
| Quantity | 26 pieces |
| Length | Custom lengths as per project requirement |
| Surface Finish | Mill finish |
| Certification | MTC 3.1 / 3.2, full chemical and mechanical test reports |
🔹Project Results & Performance
All 26 tubes were delivered on time and within specification
Pipes installed successfully in high-pressure chemical pipelines
No signs of corrosion or stress-related damage during initial operation
Client reported reduced maintenance and longer service life compared to previous projects
"The duplex stainless steel tubes supplied by Gnee provided exactly the corrosion resistance and strength we needed for our high-pressure chemical pipelines in Egypt."– Project Engineer, Egypt
🔹Applications of ASTM A790 UNS S31803 Duplex Stainless Steel Tubes
Chemical processing pipelines
Oil and gas industry piping
Offshore and marine applications
Heat exchangers and pressure vessels
Any system exposed to chlorides and corrosive chemicals
This project demonstrates why ASTM A790 UNS S31803 duplex stainless steel tubes are widely used in high-pressure and highly corrosive environments.
ASTM A790 UNS S31803 Stainless steel pipe Pricing Reference (2026)
| Diameter | SCH | Price per kg (USD) | Notes |
|---|---|---|---|
| 8" | SCH 80S | $8.00 – $9.50 | Depends on length and quantity |
| 10" | SCH 80S | $9.00 – $10.50 | Heavy-duty duplex tube pricing |
Final pricing depends on size, wall thickness, surface finish, and order quantity.Email: sales@gneestainless.com
FAQ
Q: Why choose duplex S31803 over 304 or 316 stainless steel?
Duplex S31803 offers double the strength of 304/316 and better resistance to chloride-induced corrosion.
Q: Can ASTM A790 tubes be welded on site?
Yes, duplex tubes have excellent weldability, but proper filler metals and pre/post-weld treatments are recommended.
Q: Are these tubes certified?
Yes, all tubes are supplied with MTC 3.1 / 3.2 including chemical and mechanical testing reports.
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