ASTM A179
Basic Info
The ASTM A179 standard specifies the standard specifications for seamless cold drawn low-carbon steel pipes, which are commonly used in the manufacture of boilers and heat exchangers. These pipes have good corrosion resistance and thermal conductivity, and exhibit excellent performance at low temperatures. A179 pipes undergo strict chemical composition and mechanical performance testing to ensure their quality meets standards. This standard also covers the dimensions and processing requirements of pipes to ensure their suitability for various engineering applications.
Characteristics
Seamless Construction: ASTM A179 steel is produced through a seamless manufacturing process, ensuring uniformity in composition and structural integrity. This seamless construction eliminates potential weak points and enhances reliability in heat exchange applications.
High Thermal Conductivity: ASTM A179 steel exhibits excellent thermal conductivity, making it ideal for use in heat exchangers, condensers, and similar applications where efficient heat transfer is essential. Its ability to rapidly conduct heat helps optimize the performance of thermal systems.
Corrosion Resistance: Despite its low carbon content, ASTM A179 steel offers good corrosion resistance, particularly in low-temperature environments. This corrosion resistance ensures long-term durability and reliability in harsh operating conditions.
ASTM A179 Data Sheet
Dimensions and Tolerances
Equivalent Steel Grades
Chemical Composition
Mechanical Properties
Fabrication and Welding
Dimensions and Tolerances
Shape: Round
- Outer Diameter (OD): Tolerance of ±0.015 inches (0.38 mm).
- Wall Thickness (WT): Tolerance of ±10% of the specified wall thickness.
- Length: Tolerance of +/- 1/8 inch (3.2 mm).
Shape: Other
- Custom shapes: Tolerances are specified by the manufacturer.
Equivalent Steel Grades
United States:
- Equivalent Grade(s): UNS K01200
- Standard: ASTM A179
China:
- Equivalent Grade(s): GB/T 699: 10#, 20#
- Standard: GB/T 699
Japan:
- Equivalent Grade(s): JIS G3461: STB340, STB410
- Standard: JIS G3461
Germany:
- Equivalent Grade(s): DIN 17175: St35.8, St45.8, 17Mn4
- Standard: DIN 17175
Chemical Composition
Carbon (C): 0.06–0.18%
Manganese (Mn): 0.27–0.63%
Phosphorus (P): 0.035% (max)
Sulfur (S): 0.035% (max)
Mechanical Properties
Tensile Strength: 47,000 – 60,000 psi (325 – 415 MPa)
Yield Strength: 26,000 – 47,000 psi (180 – 325 MPa)
Elongation: 35% (min)
Hardness: Not specified
Modulus of Elasticity: 29,000 ksi (200 GPa)
Poisson’s Ratio: 0.29
Fabrication and Welding
Fabrication Methods: ASTM A179 steel tubing can be fabricated using conventional methods such as cold forming, bending, and machining. It is typically supplied in the annealed condition.
Machinability: ASTM A179 steel tubing exhibits good machinability, allowing for easy cutting, drilling, and milling operations.
Forming: ASTM A179 steel tubing can be formed into various shapes using cold forming techniques. Care should be taken to avoid excessive cold working, which may cause cracking.
Heat Treatment: ASTM A179 steel tubing is not typically subjected to heat treatment as it is supplied in the annealed condition.
Weldability: ASTM A179 steel tubing has excellent weldability. It can be welded using common welding methods such as TIG welding, MIG welding, and oxyfuel welding.
Preheating and Post-Weld Heat Treatment: Preheating and post-weld heat treatment are generally not required for ASTM A179 steel tubing. However, stress relieving may be performed after welding if necessary.
Applications
ASTM A179 tubing finds extensive application across various industries due to its favorable characteristics. Primarily used in heat exchangers and condensers, this tubing excels in transferring heat efficiently while maintaining structural integrity under high temperatures and pressures. Its seamless construction and uniform dimensions make it ideal for critical applications requiring reliability and durability.
In the automotive industry, ASTM A179 tubing is employed in radiators and heaters, ensuring optimal heat transfer for engine cooling and cabin heating systems. Similarly, in the power generation sector, it plays a crucial role in steam condensers and heat recovery systems, contributing to the efficient operation of power plants. Additionally, this tubing is utilized in HVAC (heating, ventilation, and air conditioning) systems for both residential and commercial buildings, facilitating the exchange of thermal energy to maintain comfortable indoor environments.
Moreover, ASTM A179 tubing is prevalent in the manufacturing of boilers, where it facilitates the transfer of heat from combustion gases to water, thereby generating steam for various industrial processes. Its versatility extends to the chemical and petrochemical industries, where it serves in heat exchangers for refining processes, ensuring optimal performance and longevity in corrosive environments. Overall, ASTM A179 tubing’s wide-ranging applications underscore its importance in diverse sectors requiring efficient heat transfer solutions.
