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ASTM A789 UNS S32750 Duplex Stainless Tube
Material
ASTM A789 UNS S32750 is a type of duplex stainless steel tube. Duplex stainless steel is a family of stainless steels that have a mixed microstructure of austenite and ferrite phases. This material offers excellent corrosion resistance and high strength, making it suitable for various applications.
Specification
The ASTM A789 specification covers seamless and welded tubes made from UNS S32750 duplex stainless steel. The dimensions, tolerances, and mechanical properties of the tubes are specified in this standard.
Key Features
- Excellent corrosion resistance: ASTM A789 UNS S32750 exhibits superior resistance to pitting, crevice corrosion, and stress corrosion cracking.
- High strength: This material offers high yield and tensile strength, making it suitable for demanding applications.
- Good weldability: Duplex stainless steel has good weldability and can be easily joined using various welding methods.
- Low thermal expansion: ASTM A789 UNS S32750 has a low coefficient of thermal expansion, reducing the risk of distortion during heat treatment.
Chemical Composition
The chemical composition of ASTM A789 UNS S32750 is as follows:
| Element | Percentage (Weight) |
|---|---|
| Chromium (Cr) | 24.0 - 26.0% |
| Nickel (Ni) | 6.0 - 8.0% |
| Molybdenum (Mo) | 3.0 - 5.0% |
| Nitrogen (N) | 0.24 - 0.32% |
| Carbon (C) | 0.03% max |
| Manganese (Mn) | 1.2% max |
| Silicon (Si) | 0.8% max |
| Phosphorus (P) | 0.035% max |
| Sulfur (S) | 0.02% max |
Mechanical Properties
The mechanical properties of ASTM A789 UNS S32750 are as follows:
| Property | Value |
|---|---|
| Yield Strength | 550 MPa min |
| Tensile Strength | 800 MPa min |
| Elongation | 15% min |
| Hardness (HB) | 270 max |
Steel Grade
ASTM A789 UNS S32750 belongs to the grade of duplex stainless steels, which are designated as S32750. The "S" indicates it is a stainless steel, while the number "32750" denotes the specific composition and properties of this alloy.
Application
ASTM A789 UNS S32750 duplex stainless steel tubes find applications in various industries, including:
- Oil and gas exploration and production
- Chemical processing plants
- Desalination and seawater handling systems
- Heat exchangers and condensers
- Pulp and paper industry
- Structural components in marine environments
Possible Alternative Grades
There are several alternative grades to ASTM A789 UNS S32750. Some of the commonly used alternatives include:
- ASTM A790 UNS S31803: This is another type of duplex stainless steel with similar properties, but slightly lower corrosion resistance and strength.
- ASTM A928 UNS S32750: This specification covers duplex stainless steel pipes rather than tubes but offers similar performance characteristics.
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