ASTM A790 Pipes – Duplex Stainless Steel Pipe Standard for Superior Performance
Why Choose ASTM A790 Pipes from Ganyeah Group?
In demanding industries such as offshore oil & gas, chemical processing, and desalination plants, equipment failure is not an option. ASTM A790 pipes -manufactured from duplex and super duplex stainless steels-offer the perfect combination of high mechanical strength and superior corrosion resistance.
At Ganyeah Group, we don’t just supply ASTM A790 pipes; we deliver complete piping solutions backed by strict quality control, competitive lead times, and global shipping.
ASTM A790 duplex stainless steel pipes for offshore use
ASTM A790 Pipe Material Grades
The ASTM A790 standard includes several duplex stainless steel grades, such as:
- UNS S31803 / S32205 – Standard duplex stainless steel with high strength and resistance to chloride stress corrosion cracking.
- UNS S32750 (Super Duplex) – Enhanced corrosion resistance for offshore and marine applications.
- UNS S32760 (Super Duplex) – Exceptional pitting and crevice corrosion resistance, suitable for harsh chemical environments.
What is ASTM A790?
ASTM A790 is an American Society for Testing and Materials (ASTM) standard that covers seamless and welded pipes made from duplex and super duplex stainless steel grades. This specification sets strict requirements for:
- Chemical Composition – Ensuring precise percentages of chromium, nickel, molybdenum, nitrogen, and other elements for optimal corrosion resistance.
- Mechanical Properties – Specifying minimum yield and tensile strength values, often twice as high as standard austenitic stainless steels like 304 and 316.
- Manufacturing Methods – Pipes must be produced via a seamless process or by automatic welding without filler metal.
- Testing & Quality Control – Including hydrostatic testing, tensile tests, flattening tests, and nondestructive examination (e.g., ultrasonic or eddy current testing).
These requirements guarantee that every ASTM A790 pipe delivers exceptional structural integrity and long service life in harsh operating environments.
Key Advantages of ASTM A790 Duplex Stainless Steel Pipe
| Advantage | Description | Customer Benefit |
|---|---|---|
| Exceptional Corrosion Resistance | High resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC), especially in chloride-rich seawater. | Longer service life and fewer replacements in marine and offshore projects. |
| High Strength | Yield strength up to twice that of 304/316 stainless steel. | Thinner walls possible → lighter system weight & reduced material costs. |
| Good Weldability | ASTM A790 specifies post-weld heat treatment and inspection for optimal microstructure. | Reliable performance in welded joints. |
| Long-Term Cost-Effectiveness | Higher upfront cost offset by lower maintenance and extended lifespan. | Lower total cost of ownership for critical piping systems. |
Common Applications of ASTM A790 Pipe
1. Oil & Gas Industry
- High-pressure flowlines, risers, and manifolds in offshore and onshore operations.
- Resistant to hydrogen sulfide (H₂S) and chlorides in sour gas environments.
2. Chemical Processing Plants
- Heat exchangers, reactors, and process piping handling aggressive acids and solvents.
- Complies with NORSOK M-630 for critical chemical processing applications.
3. Desalination Plants
- Piping systems for seawater intake, brine discharge, and evaporator heat exchangers.
- Outstanding resistance to chloride-induced corrosion.
4. Pulp & Paper Industry
- Bleach plant piping, digesters, and chemical recovery lines.
- Excellent performance in acidic and alkaline media.
5. Marine & Shipbuilding
- Freshwater cooling systems, ballast water piping, and offshore platform infrastructure.
- Maintains strength and corrosion resistance in saltwater exposure.
Super duplex stainless steel ASTM A790 welded tubing in warehouse
Available Grades & Sizes
We supply ASTM A790 pipes in the following grades:
- Duplex 2205 (UNS S32205 / S31803)
- Super Duplex 2507 (UNS S32750 / S32760)
Size Range: 1/2″ to 24″ (DN15 to DN600)
Wall Thickness: Sch 10S to Sch 160S and custom options
Outside Diameter: 6mm – 610mm
Length: Up to 12 meters (or custom cut)
Why Choose Ganyeah Group for ASTM A790 Pipes?
- Certified Supply Chain – All pipes sourced from approved mills with full EN 10204 3.1 or 3.2 certification.
- Comprehensive Stock – Duplex and super duplex grades in seamless and welded forms, ready for immediate dispatch.
- Technical Expertise – Our engineers assist with grade selection, welding advice, and corrosion analysis.
- Global Delivery – Proven track record in supplying to oil & gas, marine, and chemical projects worldwide.
Get a Quote Today
For high-performance ASTM A790 duplex stainless steel pipes tailored to your project, contact Ganyeah Group today. Request a free material test report (MTR) and see how our expertise can add value to your operations.