ASTM A179 Carbon Steel Extruded Fin Tube For Boilers and Economizers

1. Material Specification
Base Tube Standard: ASTM A179 specifies seamless cold-drawn low-carbon steel tubes, designed for heat exchangers and condensers in medium-low temperature and high-pressure environments.

Chemical Composition (precise ranges and functions):

2. Mechanical Properties:

• Tensile Strength: ≥325 MPa
• Ensures resistance to fracture under high pressure.
• Yield Strength: ≥180 MPa
• Reflects load-bearing capacity before plastic deformation.
• Elongation: ≥35% (50mm gauge length)
• High elongation indicates ductility, suitable for cold-working processes (e.g., fin extrusion).

3. Manufacturing Process:

• Cold Drawing: Refines grain structure, improves surface finish, and ensures dimensional accuracy.
• Heat Treatment: Annealing may be applied to relieve stress, but ASTM A179 tubes are typically delivered in the "as-drawn" condition.

4. Extruded Fin Manufacturing Process

• Tube Pre-Treatment: Surface cleaning (pickling or sandblasting) to remove oxides and contaminants, ensuring fin formation quality.
• Die Design: Die Material: Tungsten carbide (high wear resistance). Die Structure: Spiral groove design to control fin height (H), pitch, and thickness.
• Extrusion: Mechanical Extrusion: The base tube is forced through rotating dies, integrally forming helical fins without welding or bonding. Cold Work Hardening: Fin regions undergo lattice distortion, increasing hardness (HV +20–30%) and fatigue resistance.
• Post-Processing: Dimensional calibration (fin height/pitch tolerance: ±0.1mm). Surface treatments: Optional galvanizing, aluminizing, or anti-corrosion coatings (e.g., epoxy).

5. Process Advantages

• Seamless Integration: Fins and base tube are monolithic, eliminating interfacial corrosion risks.
• High Thermal Conductivity: No contact thermal resistance (superior to welded or wrapped fins).
• Adjustable Fin Density: 5–11 FPI (fins per inch) balances heat transfer and pressure drop.

6. Applications

• Power Generation: Boiler economizers, air preheaters (APH), condensers.
• Petrochemical & Refining: Hydrocracker feed/effluent exchangers, crude oil preheaters.
• HVAC & Refrigeration: Industrial chiller condensers, heat pump evaporators/condensers.
• Renewable Energy: Biomass boiler flue gas heat recovery, geothermal heat exchangers.

Boilers Extruded Fin Tube

Economizers Extruded Fin Tube

ASTM A179 Carbon Steel Fin Tube

ASTM A179 Carbon Steel Extruded Fin Tube For Boilers and Economizers Images