Carbon Steel ASME SA179 Seamless U Bend Tubes for Heat Exchanger and Condenser
SA179 Seamless U-Bend Tubes are specialized tubes made from low-carbon steel, designed primarily for use in heat exchangers and condensers. The "U-bend" refers to the shape of the tube, which is bent into a U configuration to facilitate efficient heat transfer in compact heat exchange systems. These tubes are manufactured in accordance with the ASTM A179 specification, which sets the standards for seamless cold-drawn low-carbon steel tubes used in heat exchangers and condensers.
Key Features of SA179 Seamless U-Bend Tubes:
1. Material:
Made from low-carbon steel, which provides excellent thermal conductivity, good weldability, and formability.
The low carbon content also ensures resistance to corrosion and scaling.
2. Seamless Construction:
The tubes are seamless, meaning they have no welded joints, which enhances their strength, durability, and ability to withstand high pressure and temperature.
3. U-Bend Design:
The U-bend shape allows for efficient heat transfer and compact design in heat exchange systems. It also minimizes the need for additional fittings, reducing potential leak points.
4. Dimensions:
Available in various sizes and wall thicknesses to meet specific application requirements.
The bending radius and angle can be customized based on the design of the heat exchanger or condenser.
5. Surface Finish:
Typically has a smooth surface finish to minimize fouling and improve heat transfer efficiency.
Overall, seamless SA179 U-bend tubes are essential components in industries where efficient heat transfer and reliability are critical. Their design and material properties make them well-suited for demanding applications in heat exchange systems.
Material Composition of SA179 (ASTM A179)
| Element | Composition (%) |
| Carbon (C) | 0.06% - 0.18% |
| Manganese (Mn) | 0.27% - 0.63% |
| Phosphorus (P) | 0.035% max |
| Sulfur (S) | 0.035% max |
| Silicon (Si) | 0.10% min (typically 0.10% - 0.35%) |
Mechanical Properties of SA179 (ASTM A179)
| Property | Value |
| Tensile Strength | Minimum 325 MPa (47,000 psi) |
| Yield Strength | Minimum 180 MPa (26,000 psi) |
| Elongation (in 2 inches) | Minimum 35% |
| Hardness (Typical) | 72 - 77 HRB (Rockwell B scale) |
Additional Notes:
- Thermal Conductivity: High thermal conductivity, making it suitable for heat exchange applications.
- Corrosion Resistance: Good resistance to corrosion, especially in water and steam environments.
- Heat Treatment: Typically supplied in annealed or stress-relieved condition for optimal properties.
The applications of SA179 U-bend tubes:
Seamless SA179 U-bend tubes are specifically designed for use in heat exchangers and condensers. These tubes are made from low-carbon steel and are known for their excellent thermal conductivity, corrosion resistance, and ability to withstand high-pressure environments. The U-bend shape allows for efficient heat transfer and compact design in heat exchange systems. Here are the primary applications of seamless SA179 U-bend tubes:
- Heat Exchangers: SA179 U-bend tubes are widely used in shell-and-tube heat exchangers, where they facilitate the transfer of heat between two fluids. Their seamless construction ensures reliability and efficiency in high-pressure and high-temperature environments. They are commonly used in industries such as petrochemical, oil and gas, power generation, and HVAC (heating, ventilation, and air conditioning).
- Condensers: These tubes are ideal for condensers, where they help convert vapor or gas into liquid by cooling. They are often used in power plants, refrigeration systems, and chemical processing plants.
- Refrigeration and Air Conditioning: SA179 U-bend tubes are used in refrigeration systems and air conditioning units, where they play a critical role in heat exchange processes.
- Power Plants: In power generation facilities, these tubes are used in condensers and heat exchangers to improve thermal efficiency and maintain system performance.
- Petrochemical and Chemical Industries:They are used in various heat exchange applications in refineries and chemical plants, where they handle corrosive fluids and high temperatures.
- Marine Applications: SA179 U-bend tubes are used in marine heat exchangers and condensers, where they must withstand harsh environments and saline conditions.
- Food and Beverage Industry: In food processing, these tubes are used in heat exchangers for pasteurization, sterilization, and other temperature-controlled processes.
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