ASTM A498 Grade 1, 3, 6, 7, 8 Stainless Steel Finned Tube Seamless Steel Tube for Carbon Heat-Exchanger
Material Specification
ASTM A498 is a specification that covers seamless and welded carbon and alloy steel tubes with integral fins. These tubes are primarily used in heat exchangers, where efficient heat transfer is critical. The specification includes various grades, such as Grade 1, 3, 6, 7, and 8, each offering distinct properties suitable for different applications.
Key Features
- High Thermal Conductivity: The finned design enhances heat transfer efficiency, making these tubes ideal for heat exchangers.
- Corrosion Resistance: Stainless steel grades provide excellent resistance to corrosion, extending the lifespan of the tubes.
- Durability: The seamless construction ensures high strength and durability, suitable for high-pressure applications.
- Versatility: Available in multiple grades to meet specific application requirements.
Chemical Composition
Below is a table presenting the typical chemical composition for the ASTM A498 stainless steel finned tubes:
| Element | Grade 1 | Grade 3 | Grade 6 | Grade 7 | Grade 8 |
| Carbon (C) | ≤ 0.30% | ≤ 0.30% | ≤ 0.30% | ≤ 0.30% | ≤ 0.30% |
| Manganese (Mn) | 0.29-1.06% | 0.29-1.06% | 0.29-1.06% | 0.29-1.06% | 0.29-1.06% |
| Phosphorus (P) | ≤ 0.035% | ≤ 0.035% | ≤ 0.035% | ≤ 0.035% | ≤ 0.035% |
| Sulfur (S) | ≤ 0.035% | ≤ 0.035% | ≤ 0.035% | ≤ 0.035% | ≤ 0.035% |
| Silicon (Si) | ≤ 0.40% | ≤ 0.40% | ≤ 0.40% | ≤ 0.40% | ≤ 0.40% |
| Chromium (Cr) | 16.0-18.0% | 16.0-18.0% | 16.0-18.0% | 16.0-18.0% | 16.0-18.0% |
| Nickel (Ni) | 8.0-10.5% | 8.0-10.5% | 8.0-10.5% | 8.0-10.5% | 8.0-10.5% |
Mechanical Properties
The mechanical properties of ASTM A498 stainless steel finned tubes are outlined in the following table:
| Property | Grade 1 | Grade 3 | Grade 6 | Grade 7 | Grade 8 |
| Tensile Strength (MPa) | ≥ 485 | ≥ 485 | ≥ 485 | ≥ 485 | ≥ 485 |
| Yield Strength (MPa) | ≥ 275 | ≥ 275 | ≥ 275 | ≥ 275 | ≥ 275 |
| Elongation (%) | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 | ≥ 20 |
| Hardness (HB) | ≤ 187 | ≤ 187 | ≤ 187 | ≤ 187 | ≤ 187 |
Steel Grade
The ASTM A498 specification includes several grades, each designed to meet specific performance criteria. The grades are differentiated based on their chemical composition and mechanical properties, allowing for tailored solutions in various industrial applications.
Application
ASTM A498 stainless steel finned tubes are widely used in:
- Heat Exchangers: For efficient heat transfer in power plants, chemical processing, and HVAC systems.
- Boilers: To enhance heat transfer efficiency and reduce energy consumption.
- Petrochemical Industry: For processing and refining operations where corrosion resistance is crucial.
Possible Alternative Grades
While ASTM A498 provides a robust solution for many applications, alternative grades may be considered depending on specific requirements:
- ASTM A213: For seamless ferritic and austenitic alloy steel boiler, superheater, and heat-exchanger tubes.
- ASTM A269: For seamless and welded austenitic stainless steel tubing for general service.
- ASTM A312: For seamless, welded, and heavily cold worked austenitic stainless steel pipes.
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