ASTM A790 Stainless Steel Pipe


ASTM A790 Stainless Steel Pipe

ASTM A790 is a standard specification for seamless and welded ferritic/austenitic stainless steel pipe, also known as duplex stainless steel pipe. This specification is designed for general corrosive service and high-temperature applications. ASTM A790 pipes offer excellent mechanical properties and corrosion resistance, particularly in chloride-containing environments.

ASTM A790 Steel Pipe Range

  • Type: Seamless and Welded
  • Material: Ferritic/Austenitic (Duplex) Stainless Steel
  • Service: General Corrosive Service, High-Temperature Applications

ASTM A790 Steel Pipe Size Range


Nominal Pipe Size (NPS) Outside Diameter (OD) (inches) Schedule (Wall Thickness)
1/8 0.405 Sch 5s to XXH
1/4 0.54 Sch 5s to XXH
3/8 0.675 Sch 5s to XXH
1/2 0.84 Sch 5s to XXH
3/4 1.05 Sch 5s to XXH
1 1.315 Sch 5s to XXH
1 1/2 1.9 Sch 5s to XXH
2 2.375 Sch 5s to XXH
3 3.5 Sch 5s to XXH
4 4.5 Sch 5s to XXH
6 6.625 Sch 5s to XXH
8 8.625 Sch 5s to XXH
10 10.75 Sch 5s to XXH
12 12.75 Sch 5s to XXH
14 14 Sch 5s to XXH
16 16 Sch 5s to XXH
18 18 Sch 5s to XXH
20 20 Sch 5s to XXH
24 24 Sch 5s to XXH

ASTM A790 Steel Pipe Material Grade

Grade Description
UNS S31803 Standard duplex stainless steel with 22% Cr, 5.5% Ni, 3% Mo
UNS S32205 Enhanced version of S31803 with improved corrosion resistance
UNS S32750 Super duplex stainless steel with 25% Cr, 7% Ni, 4% Mo, higher strength
UNS S32760 Super duplex stainless steel with 25% Cr, 7% Ni, 3.5% Mo, higher strength and pitting resistance

ASTM A790 Steel Pipe Mechanical Properties

Grade Tensile Strength (MPa) Yield Strength (MPa) Elongation (%)
UNS S31803 ≥ 620 ≥ 450 ≥ 25
UNS S32205 ≥ 655 ≥ 450 ≥ 25
UNS S32750 ≥ 795 ≥ 550 ≥ 25
UNS S32760 ≥ 750 ≥ 550 ≥ 25

Comparison with Other Stainless Steel Pipes

Property ASTM A790 (Duplex) ASTM A312 (Austenitic) ASTM A358 (Austenitic)
Corrosion Resistance Excellent, especially in chloride environments Good, but less than duplex Good, but less than duplex
Strength Higher Moderate Moderate
Cost Moderate to High Moderate Moderate
Applications Chemical processing, oil and gas, marine General piping, food processing, pharmaceuticals High-temperature, general corrosive service
Common Grades S31803, S32205, S32750 304, 316, 321 304, 316, 321
Temperature Resistance High High High
Weldability Good, requires skilled techniques Excellent


When comparing ASTM A790 stainless steel pipes with other stainless steel pipes made of different materials, it’s important to consider various factors such as composition, properties, and intended use. ASTM A790 stainless steel pipes are specifically designed as duplex stainless steel pipes, which offer a combination of both ferritic and austenitic microstructures. This results in pipes that have higher strength and better corrosion resistance compared to traditional austenitic stainless steel pipes like 304 or 316 stainless steel.

In terms of corrosion resistance, ASTM A790 stainless steel pipes are known for their excellent resistance to pitting and crevice corrosion, making them suitable for use in harsh environments such as chemical processing, oil and gas, and marine applications. They also exhibit good mechanical properties, including high tensile strength and impact resistance.

On the other hand, when compared to other types of stainless steel pipes made of different materials, ASTM A790 stainless steel pipes may be more expensive due to their alloy composition. However, their superior properties make them a preferred choice for applications where both strength and corrosion resistance are critical.

In summary, ASTM A790 stainless steel pipes offer a unique combination of properties that set them apart from other stainless steel pipes made of different materials.



ABTER Steel prides itself in providing around the clock services to our customers.
+ 86-317-3736333

[email protected]


Follow our activity

In addition to our pipe & fittings stock, Cutting, Testing and Supplement Services, and to the above mentioned services, we also offer large/hard to find items in ….Flanges,Fittings,Tube / Pipe.