ASTM A179 tubes are manufactured using seamless cold-drawing processes 510. For precision tubes like those potentially used for fin applications, manufacturers employ:

Multi-pass mild cold drawing with total deformation ≤25% to avoid work hardening.
Controlled temperature heat treatment at 620–660°C with temperature fluctuations ≤±5°C to eliminate cold drawing stresses.
Segmental tension straightening for long-length tubes (e.g., 15m) with residual stress ≤10MPa.
Advanced surface treatments including acid pickling + passivation to achieve surface roughness Ra ≤ 0.8μm 1, with optional phosphating (2–3g/m² coating weight) for enhanced corrosion resistance.

For longitudinal fin tubes, additional processes would include:

Fin forming through extrusion, welding, or machining processes.
Fin height and thickness control to optimize heat transfer surface area.
Potential bending operations for U-tube configurations.

3. A179 Longitudinal Fin Tube Performance Characteristics

Heat Transfer Efficiency:

The low-carbon steel composition provides high thermal conductivity (λ ≥ 45 W/m·K).
Thin-wall design (e.g., 2.0mm) enhances heat conduction by approximately 15% compared to thicker-walled tubes.
Longitudinal fins significantly increase the heat transfer surface area, potentially improving efficiency by 30-50% depending on fin geometry.

Pressure and Corrosion Resistance:

Hydrostatic test pressure: ≥18 MPa (standard calculated value: 22.6 MPa).

Intergranular corrosion resistance: Passes CuSO₄ + H₂SO₄ test (ASTM A262 Practice E) without grain boundary corrosion tendency.

Phosphating treatment option: Provides salt spray resistance ≥72 hours.

Vibration and Fatigue Resistance:

Natural frequency >50Hz at 15m length (avoiding common equipment vibration frequencies of 30–40Hz).

Vibration fatigue resistance: Withstands 10⁷ cycles at ±0.5mm amplitude @30Hz without cracking

4. A179 Longitudinal Fin Tube Fin Tube Application

Power plant condensers (single-pass length >12m).
Ship seawater cooling systems.
Multi-effect evaporator long tube bundles.
Nuclear steam generators and high-pressure heat exchangers (with appropriate nuclear-grade qualifications).
Supercritical heat exchangers (working pressure 32MPa @620°C).
Chemical processing heat exchangers where corrosion resistance and cleanability are important.

5. A179 Longitudinal Fin Tube Quality Assurance and Testing

100% eddy current testing per ASTM A450 Section 26, with detection sensitivity for Φ0.3mm through-holes.
Ultrasonic wall thickness sorting: Segmental scanning every 200mm, wall thickness fluctuation <±0.1mm.
Hydrostatic testing: 22 MPa/10s without leakage.
Flattening test: Pressed to H=3.4t (standard requires 1.4t) without cracking.
Flaring test: Inner diameter expanded by 32% (standard requires 30%) without cracking.
Helium mass spectrometry leak detection: ≤1×10⁻⁹ Pa·m³/s (for nuclear grade requirements).

Inquiry Cart 0