ASTM A179 Heat Exchanger Tube
Material
ASTM A179 is a standard specification for seamless cold-drawn low-carbon steel tubes specifically designed for heat exchangers, condensers, and similar heat transfer apparatus. These tubes are known for their excellent thermal conductivity and are widely used in industries where efficient heat transfer is crucial.
Specification
ASTM A179 tubes are manufactured to meet stringent quality standards, ensuring they can withstand high temperatures and pressures. The specification covers seamless cold-drawn low-carbon steel tubes with a minimum wall thickness for use in tubular heat exchangers, condensers, and similar heat transfer devices.
Key Features
Seamless Construction: Ensures uniformity and strength, reducing the risk of leaks and failures.
Cold-Drawn Process: Enhances dimensional accuracy and surface finish, providing better mechanical properties.
Low Carbon Content: Improves weldability and reduces the risk of carbide precipitation.
High Thermal Conductivity: Ideal for efficient heat transfer applications.
Corrosion Resistance: Suitable for environments where corrosion resistance is a concern.
Chemical Composition
| Element | Composition (%) |
| Carbon (C) | 0.06 - 0.18 |
| Manganese (Mn) | 0.27 - 0.63 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
Mechanical Properties
| Property | Value |
| Tensile Strength | ≥ 325 MPa (47,000 psi) |
| Yield Strength | ≥ 180 MPa (26,000 psi) |
| Elongation | ≥ 35% |
Physical Properties
| Property | Value |
| Density | 7.85 g/cm³ |
| Melting Point | 1425-1540°C |
| Thermal Conductivity | 51.9 W/m·K |
| Specific Heat | 0.486 J/g·K |
Process Performance
| Process | Performance |
| Machinability | Good |
| Weldability | Excellent |
| Formability | High |
| Corrosion Resistance | Moderate |
Steel Grade
ASTM A179 is a low-carbon steel grade that is specifically designed for heat exchanger and condenser tubes. Its low carbon content ensures excellent weldability and reduces the risk of carbide precipitation during welding. The cold-drawn process enhances its mechanical properties, making it suitable for high-pressure applications. The steel grade is known for its high thermal conductivity, making it ideal for efficient heat transfer.
Application
ASTM A179 tubes are widely used in:
Heat Exchangers: For efficient heat transfer between fluids.
Condensers: In power plants and refrigeration systems.
Boilers: For steam generation and heat recovery.
Chemical Processing: In equipment where corrosion resistance and thermal conductivity are essential.
Possible Alternative Grades
ASTM A192: Similar to A179 but with higher carbon content, suitable for high-pressure applications.
ASTM A210: Medium-carbon steel tubes for boiler and superheater applications.
ASTM A213: Alloy steel tubes for high-temperature service, offering enhanced corrosion resistance.
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