ASTM A790, ASTM A928, S32205,S31803 , S32750 Duplex Steel Pipe
Jan 15, 2026
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If you are looking for high-performance duplex stainless steel pipes for demanding applications, such as chemical processing, oil & gas, or marine industries, then ASTM A790, ASTM A928, S32205, S31803, and S32750 duplex steel pipes should be at the top of your list. These duplex alloys provide superior corrosion resistance, high strength, and excellent resistance to pitting and crevice corrosion, making them ideal for environments that involve high pressure, high temperature, and aggressive chemicals.
At Gnee Steel, we offer a wide range of duplex steel pipes, with full certifications and tailored solutions to meet your specific project needs. Our pipes are manufactured according to ASTM A790, ASTM A928, and other industry standards, ensuring that they meet the highest quality and performance requirements.
What Is ASTM A790 Duplex Steel Pipe?
ASTM A790 Duplex Steel Pipe is a standard for seamless and welded pipes made from ferritic/austenitic (duplex) stainless steels, offering a unique mix of high strength (often double austenitic grades), excellent corrosion resistance (especially to pitting and stress corrosion cracking in chloride environments), and good toughness, making it ideal for marine, chemical, and heat exchanger applications. These pipes contain significant chromium and molybdenum, creating dual-phase microstructures for superior performance, with common grades including S31803 (2205) and S32750/S32760 (super duplex).
What is ASTM A928 duplex stainless steel pipe?
ASTM A928 standard covers duplex stainless steel pipes, with a particular focus on ferritic-austenitic stainless steel. Duplex steels conforming to the ASTM A928 standard are used in welded form, and S31803 and S32205 are the most commonly used duplex steel grades for welded pipes. These alloys offer high strength and corrosion resistance and are frequently used in offshore engineering, chemical processing, and oil and gas pipelines.
ASTM A790 Duplex Stainless Steel Pipe Grades
ASTM A790 is the standard specification for seamless and welded duplex stainless steel pipes. It includes various grades, such as S32205, S31803, and S32750, each designed for different environmental conditions. Below is a comparison of these grades:
| Grade | UNS Number | Chemical Composition | Corrosion Resistance | Common Applications |
|---|---|---|---|---|
| S32205 | UNS S32205 | 22% Cr, 5% Ni, 3% Mo, 0.17% N | Excellent resistance to pitting and crevice corrosion | Chemical processing, offshore, pressure vessels |
| S31803 | UNS S31803 | 22% Cr, 5% Ni, 3% Mo, 0.17% N | High resistance to chloride stress corrosion cracking | Petrochemical, desalination plants |
| S32750 | UNS S32750 | 25% Cr, 7% Ni, 4% Mo, 0.24% N | Exceptional resistance to pitting and crevice corrosion | Marine, offshore, power plants, refineries |
ASTM A790 / A928 Duplex Steel Pipe Specifications:
| Property | S32205 (ASTM A790) | S31803 (ASTM A790) | S32750 (ASTM A790) |
|---|---|---|---|
| Grade | UNS S32205 | UNS S31803 | UNS S32750 |
| Yield Strength (MPa) | ≥ 450 | ≥ 450 | ≥ 550 |
| Tensile Strength (MPa) | ≥ 620 | ≥ 620 | ≥ 800 |
| Elongation (%) | ≥ 25 | ≥ 25 | ≥ 25 |
| Hardness (HB) | ≤ 248 | ≤ 248 | ≤ 250 |
| Pitting Resistance Equivalent (PREN) | ≥ 35 | ≥ 35 | ≥ 40 |
| Surface Finish | 2B, Polished, Pickled | 2B, Polished, Pickled | 2B, Polished, Pickled |
ASTM A790 / A928 Duplex Steel Pipe price
| Grade | Size Range | Price (USD per kg) | Price (USD per meter) |
|---|---|---|---|
| S32205 | 1/2" – 24" | 5.0 – 7.0 | 40 – 85 |
| S31803 | 1/2" – 24" | 5.2 – 7.2 | 42 – 87 |
| S32750 | 1/2" – 24" | 7.0 – 9.0 | 70 – 120 |
Note: Prices fluctuate based on market demand, order volume, and material availability. Always check with the supplier for real-time pricing.
What are the differences between ASTM A790 and ASTM A928?
The main difference is manufacturing method: ASTM A790 covers seamless & welded duplex/super duplex pipes, often welded without filler metal, while ASTM A928 is specifically for electric fusion welded (EFW) pipes, requiring filler metal addition for specific compositions. A790 is a broader standard for various duplex pipe types (welded/seamless), whereas A928 focuses on EFW, offering different material classes for specialized corrosion/temperature needs.
What is the difference between S32205 and S32750 duplex steel?
S32205 is suitable for general applications requiring good corrosion resistance, while S32750 offers superior resistance to pitting and crevice corrosion, making it ideal for severe marine or chemical environments.
What industries use duplex stainless steel pipes?
Duplex stainless steel pipes are commonly used in industries such as oil and gas, chemical processing, desalination, marine, offshore, and power generation, where high strength and corrosion resistance are crucial.
If you are looking for ASTM A790, ASTM A928, S32205, S31803, or S32750 Duplex Steel Pipes, you are selecting one of the Most Reliable Materials available for High-Stress, High-Corrosion environments. These duplex steel pipes are Ideal For Applications in industries such as Marine, Chemical Processing, and Oil & Gas, where both Strength And Corrosion Resistance are essential.
📩 Contact Gnee Steel Today to get the latest Pricing, Stock Availability, and Technical Support for your Duplex Stainless Steel Pipe Needs.
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