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.
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