ASTM A179 Carbon Steel Base Tube with Aluminum Embedded Finned Tube (G-Type) for Air-Cooled Heat Exchangers in Petrochemical and Power Plant Service
In air-cooled heat exchangers (ACHE) and waste heat recovery systems operating in petrochemical refining, natural gas processing, and thermal power plants, operators frequently face limited heat transfer surface area, fin loosening under thermal cycling and vibration, elevated contact resistance, and reduced long-term efficiency. Our ASTM A179 seamless carbon steel base tube with aluminum G-type embedded fins directly addresses these issues by providing a mechanically locked, high-integrity fin-to-tube bond that maintains stable thermal performance up to 400 °C while significantly increasing external surface area.
Product Structure – ASTM A179 Base Tube + Aluminum Fins with Embedded Process
The tube consists of a seamless cold-drawn low-carbon steel base tube manufactured to ASTM A179 / ASME SA179, with continuous aluminum fin strip (typically Alloy 1060 or 1100) mechanically embedded into a precision-machined helical groove on the outer surface.
Manufacturing sequence:
- Helical groove is cut into the base tube wall (typical depth ≈ 0.35–0.5 mm).
- Aluminum fin strip is tension-wound into the groove under controlled preload.
- Groove edges are rolled/peened over the fin root to create a positive mechanical lock.
This process produces a metal-to-metal mechanical bond with pull-out force typically ≥ 70 N, ensuring the fins remain secure under thermal shock, vibration, and high-velocity air flow common in forced-draft air coolers.
Chemical Composition – ASTM A179 Base Tube and Aluminum Fin Material
| Element |
ASTM A179 Base Tube (wt%) |
Aluminum 1060 Fin (typical, wt%) |
Aluminum 1100 Fin (typical, wt%) |
| Carbon (C) |
0.06 – 0.18 |
— |
— |
| Manganese (Mn) |
0.27 – 0.63 |
≤ 0.03 |
≤ 0.05 |
| Phosphorus (P) |
≤ 0.035 |
— |
— |
| Sulfur (S) |
≤ 0.035 |
— |
— |
| Silicon (Si) |
— |
≤ 0.25 |
≤ 0.95 (Si+Fe) |
| Iron (Fe) |
— |
≤ 0.35 |
≤ 0.95 (Si+Fe) |
| Copper (Cu) |
— |
≤ 0.05 |
0.05 – 0.20 |
| Aluminum (Al) |
— |
≥ 99.6 |
≥ 99.0 |
Dimensional Range and Tolerance – ASTM A179 + Aluminum Embedded Finned Tube
| Parameter |
Standard Range |
Typical Tolerance |
| Base Tube OD |
15.88 – 50.8 mm (5/8" – 2") |
± 0.10 mm |
| Base Tube Wall Thickness |
≥ 1.65 mm (suitable for embedding) |
± 10 % |
| Fin Height |
6.35 – 15.88 mm (up to ≈ 16.5 mm) |
± 0.20 mm |
| Fin Thickness |
0.30 – 0.50 mm (typical 0.40 mm) |
± 0.03 mm |
| Fin Pitch / Density |
2.1 – 5.0 mm / 5 – 11 FPI |
± 0.5 FPI or ± 2 % |
| Embedded Depth |
0.15 – 0.25 mm |
± 0.03 mm |
| Overall Length |
Up to 12 000 – 18 000 mm |
± 2 – 3 mm |
| Unfinned Ends |
20 – 150 mm (custom) |
± 2 mm |
Performance Advantages in Air-Cooled and Waste-Heat Recovery Service
- Stable mechanical bond eliminates progressive fin loosening that occurs with tension-wound L/LL/KL fins under repeated thermal cycling.
- Contact thermal resistance remains low and consistent, delivering 8–12 times greater external surface area than bare tubes and measurably higher overall heat-transfer coefficients in gas-to-liquid or air-side duty.
- Maximum continuous operating temperature of 400 °C (some configurations rated to 450 °C) suits process air coolers, charge-air coolers, and economizers.
- Excellent resistance to vibration and high-velocity air streams common in forced-draft ACHE bundles.
- Zinc or aluminum metallized protection available on bare ends for atmospheric corrosion resistance during storage and installation.
Application Focus – Petrochemical Air Coolers, Power Plant Economizers & Waste Heat Recovery
These ASTM A179 + aluminum G-type embedded finned tubes are specified for:
- Air-cooled heat exchangers (ACHE) cooling process streams in refining and petrochemical units
- Charge-air coolers and compressor aftercoolers
- Waste-heat recovery units and economizers in thermal power plants
- Natural-gas treatment and LNG-related air coolers
- Condensers and process heaters requiring reliable fin retention under cyclic temperature and vibration
The product increases heat-rejection capacity within existing plot space, reduces the number of tube rows required, and lowers long-term maintenance associated with fin detachment or performance degradation.
Packaging, Logistics & Commercial Terms
Tubes are packed in sturdy plywood cases or steel-frame wooden crates with plastic end caps and internal supports to prevent fin damage during ocean or land transport. Export packing complies with ISPM 15 where required.
- MOQ: 200–500 kg or equivalent length (negotiable for trial orders)
- Price Basis: FOB Chinese main ports (Shanghai, Ningbo, Tianjin, etc.)
- Lead Time: 35–60 days after order confirmation and receipt of deposit / L/C, depending on quantity and specification
- Payment: T/T or irrevocable L/C at sight
Certificates & Quality Control – ASTM A179 Material Traceability
Each shipment is supplied with:
- EN 10204 3.1 Mill Test Certificate covering chemical composition and mechanical properties of the ASTM A179 base tube
- Dimensional inspection reports and fin pull-out test records
- Hydrostatic or eddy-current testing as specified
- ISO 9001 quality system certification
- Optional third-party inspection (SGS, BV, etc.)
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