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ASTM A790 S31803 S32750 S32205 Deplex Steel Pipe
Material
The ASTM A790 S31803 S32750 S32205 Deplex Steel Pipe specification covers seamless and welded ferritic/austenitic stainless steel pipe. It includes three grades: S31803, S32750, and S32205, which belong to the Duplex stainless steel family.
Specification
The specification ASTM A790 defines the requirements for seamless and welded duplex stainless steel pipes. These pipes are commonly used in various industries such as oil and gas, chemical processing, and offshore platforms.
Key Features
The key features of ASTM A790 duplex steel pipes are:
- Duplex Structure: The material exhibits a balanced combination of ferrite and austenite phases, providing excellent strength and corrosion resistance.
- High Resistance to Corrosion: Duplex stainless steel pipes offer superior resistance to various corrosive environments, including chloride-induced stress corrosion cracking.
- High Strength: Duplex steel pipes exhibit high tensile and yield strength, making them suitable for demanding applications.
- Good Weldability: ASTM A790 duplex steel pipes can be easily welded using conventional techniques.
- Excellent Toughness: These pipes possess high impact toughness, allowing them to withstand harsh conditions.
Cost-Effective: Duplex stainless steel pipes offer a cost-effective solution due to their favorable combination of properties and long-lasting performance.
Chemical Composition
The chemical composition of ASTM A790 duplex steel pipes (grades S31803, S32750, and S32205) is as follows (in weight %):
| Element | Grade S31803 | Grade S32205 | Grade S32750 |
| Chromium | 21.0 - 23.0 | 22.0 - 23.0 | 24.0 - 26.0 |
| Nickel | 4.5 - 6.5 | 4.5 - 6.5 | 6.0 - 8.0 |
| Molybdenum | 2.5 - 3.5 | 3.0 - 3.5 | 3.0 - 5.0 |
| Nitrogen | 0.08 - 0.20 | 0.14 - 0.20 | 0.24 - 0.32 |
| Others* | ≤ 2.5 | ≤ 2.5 | ≤ 2.5 |
*The "Others" category includes elements such as manganese, silicon, copper, and sulfur.
Mechanical Properties
The mechanical properties of ASTM A790 duplex steel pipes (grades S31803, S32750, and S32205) are as follows:
| Property | Grade S31803 | Grade S32205 | Grade S32750 |
| Tensile Strength | ≥ 620 MPa | ≥ 655 MPa | ≥ 795 MPa |
| Yield Strength | ≥ 450 MPa | ≥ 450 MPa | ≥ 550 MPa |
| Elongation | ≥ 25% | ≥ 25% | ≥ 15% |
| Hardness (HB) | ≤ 290 | ≤ 290 | ≤ 310 |
| Impact Toughness (J) | ≥ 100 | ≥ 100 | ≥ 50 |
Steel Grade
ASTM A790 includes the following steel grades:
- Grade S31803: This duplex stainless steel grade offers good general corrosion resistance and high strength.
- Grade S32205: It is a higher grade variant of S31803, providing better corrosion resistance and improved weldability.
Grade S32750: Also known as Super Duplex, this grade exhibits excellent resistance to corrosion and high mechanical strength.
Application
ASTM A790 duplex steel pipes find applications in various sectors, such as:
- Oil and Gas Industry: These pipes are widely used for offshore and onshore oil and gas exploration, production, and transportation.
- Chemical Processing: Duplex steel pipes are suitable for chemical processing plants due to their resistance to corrosive chemicals and high-temperature environments.
- Desalination Plants: Their resistance to chloride-induced stress corrosion cracking makes them ideal for desalination plant applications.
- Pulp and Paper Industry: Duplex stainless steel pipes are used in bleach plants and other pulp and paper manufacturing processes.
Structural Applications: These pipes can be used for construction purposes, including bridges, buildings, and infrastructure projects.
Possible Alternative Grades
If alternative grades are required, the following options can be considered:
- ASTM A928/A928M: Specification for Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric Fusion Welded with Addition of Filler Metal
- ASTM A789/A789M: Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service
- ASTM A928/A928M: Specification for Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric Fusion Welded with Addition of Filler Metal
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