ASTM A790 / ASME SA790 S32750 Seamless Ferritic Stainless Steel Tube For Automobile
Material and Specification
ASTM A790 / ASME SA790 S32750 is a seamless ferritic stainless steel tube specifically designed for use in automobiles. It is commonly known as S32750 stainless steel or by its trade name Super Duplex 2507. The material is widely used in various automotive applications due to its exceptional strength, corrosion resistance, and durability.
This tube is manufactured according to the ASTM A790 and ASME SA790 specifications, which outline the requirements for seamless and welded ferritic/austenitic stainless steel tubes for general corrosive service.
Key Features
The ASTM A790 / ASME SA790 S32750 stainless steel tube offers several key features that make it well-suited for automotive applications:
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High Strength: S32750 stainless steel exhibits significantly higher strength compared to traditional stainless steels, making it ideal for demanding automotive components.
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Excellent Corrosion Resistance: This stainless steel tube is highly resistant to corrosion in a wide range of aggressive environments, including those encountered in the automotive industry.
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Superior Toughness: The material provides outstanding toughness, which ensures the tube can withstand external impacts and vibrations commonly experienced in automotive applications.
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Good Weldability: S32750 stainless steel demonstrates good weldability, allowing for easy fabrication of complex automotive structures.
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Wide Temperature Range: The material maintains its mechanical properties over a broad temperature range, making it suitable for both high-temperature and low-temperature automotive applications.
Chemical Composition
The chemical composition of ASTM A790 / ASME SA790 S32750 stainless steel (in weight percentage) is presented in the following table:
| Element | Minimum | Maximum |
| Chromium | 24.0 | 26.0 |
| Nickel | 6.0 | 8.0 |
| Molybdenum | 3.0 | 5.0 |
| Nitrogen | 0.24 | 0.32 |
| Carbon | 0.030 | - |
| Silicon | 0.80 | - |
| Manganese | 1.20 | - |
| Phosphorus | - | 0.035 |
| Sulfur | - | 0.020 |
| Copper | - | 0.50 |
Please note that the above composition may vary depending on the steel manufacturer.
Mechanical Properties
The mechanical properties of ASTM A790 / ASME SA790 S32750 stainless steel are given in the following table:
| Property | Value |
| Tensile Strength (MPa) | 795 - 1000 |
| Yield Strength (0.2% offset) | ≥ 550 |
| Elongation (%) | ≥ 15 |
| Hardness (Brinell) | ≤ 310 |
Steel Grade: S32750
Application
The ASTM A790 / ASME SA790 S32750 stainless steel tube finds extensive application in the automotive industry. It is commonly used for the following purposes:
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Exhaust Systems: S32750 stainless steel tubes are well-suited for manufacturing exhaust systems due to their high-temperature resistance and excellent corrosion resistance in harsh environments.
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Fuel Delivery Systems: The material's resistance to various types of fuels, including gasoline and diesel, makes it suitable for constructing fuel delivery systems, such as fuel tanks and fuel lines.
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Hydraulic Systems: S32750 stainless steel tubes are utilized in hydraulic systems where resistance to corrosion and high pressures is crucial.
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Structural Components: The superior strength and toughness of this stainless steel make it ideal for structural components in automobiles, ensuring the safety and durability of the vehicle.
Possible Alternative Grades
Several alternative grades to ASTM A790 / ASME SA790 S32750 stainless steel exist, depending on the specific requirements and environmental conditions. Some potential alternatives include:
- S31803 / 2205 Duplex Stainless Steel
- S32550 Super Duplex Stainless Steel
- S32760 Super Duplex Stainless Steel
- S31254 / 254 SMO Stainless Steel
It is essential to consult with engineers and experts to determine the most suitable alternative grade for a particular automotive application.
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