Yuhong Group Co., Ltd. designs and manufactures shell and tube heat exchangers, pressure vessels, and air coolers, supported by an integrated supply of tube bundles, U-tubes, finned tubes, and heat exchanger components including tubesheets, baffles, and heads.
Our ASME SA179 / SA210 A1 G-Type finned tube bundles are engineered for air cooled heat exchangers (ACHE) in refineries, petrochemical plants, and power generation facilities. The base tubes are cold-drawn seamless, fully killed carbon steel to ASME SA179 or SA210 A1, with aluminum fins (Alloy 1060/1050) mechanically embedded into a helical groove plowed into the tube outer surface.
| Parameter | ASME SA179 Base Tube | ASME SA210 A1 Base Tube |
|---|---|---|
| Base Tube OD | 15.88 – 50.80 mm | 15.88 – 50.80 mm |
| Wall Thickness | ≥ 1.65 mm | ≥ 2.0 mm |
| Fin Height | 6.35 – 15.88 mm | 6.35 – 15.88 mm |
| Fin Thickness | 0.20 – 0.50 mm | 0.20 – 0.50 mm |
| Fin Pitch | 5 – 11 FPI | 5 – 11 FPI |
| Max. Operating Temp. | ~400°C (Al fins) | ~400°C (Al fins) |
| Fin Type | Embedded G-Type | Embedded G-Type |
| Region | ASME SA179 | ASME SA210 A1 |
|---|---|---|
| EN | P195GH/P235GH | P235GH |
| GB (China) | 10# / 20# | 20# |
ASME SA179 covers cold-drawn low-carbon steel tubes for heat exchanger and condenser service. ASME SA210 A1 specifies medium-carbon seamless tubes for boiler and superheater applications, offering higher tensile strength (≥415 MPa) and yield strength (≥255 MPa).
ASME SA179 tubes undergo heat treatment at a minimum temperature of 650°C (1200°F) after the final cold-draw pass, producing a uniform ferrite-pearlite microstructure with low residual stress. Hardness is controlled to ≤72 HRB. ASME SA210 A1 tubes similarly deliver a tensile strength of ≥415 MPa and yield strength ≥255 MPa, suitable for elevated-pressure service.
The embedded G-fin design maintains a continuous metallic contact between the aluminum fin foot and the grooved tube wall, eliminating the air gap that accelerates galvanic corrosion in wrapped-fin or tension-wound constructions. Fin pull-off force is typically ≥70N, which limits relative movement under thermal cycling and reduces crevice corrosion initiation at the fin root. For mildly corrosive environments where carbon steel alone is insufficient, aluminum fins provide sacrificial cathodic protection to the exposed tube surface.
The G-Type embedded finning process involves three stages: plowing a helical groove 0.25–0.30 mm deep into the tube outer wall, inserting the aluminum fin strip under controlled tension, and back-filling the displaced tube metal to lock the fin root permanently.
Each finned tube bundle is inspected per ASME Code and API 661 requirements. Testing includes chemical composition verification, tensile and yield strength testing, hardness testing, dimensional inspection of tube OD, fin height, and fin pitch, plus hydrostatic testing at 1.5× design pressure. Mill Test Certificates to EN 10204 3.1 are issued with full chemical and mechanical traceability.
Oil and gas / refinery ACHE units: Overhead condensers, inter-stage coolers
Petrochemical plants: Process gas cooling where the medium temperature reaches 250–400°C
Power generation: Air-cooled condensers and auxiliary cooling systems
Chemical processing: Heat rejection for mildly corrosive fluids
Q: What causes fin detachment in air cooler service?
Fin-to-tube differential expansion is the primary driver. When the base tube and fin material expand at different rates, tension-wound fins can loosen, creating a thermal contact resistance that progressively reduces heat transfer. The embedded G-fin design mitigates this by locking the fin root into the tube wall, but continuous operating temperatures above 400°C with aluminum fins remain a design limit.
Q: SA179 vs. SA210 A1 — how to choose the correct base tube?
SA179 is a low-carbon grade with tensile strength ≥325 MPa, best suited for lower-pressure heat exchanger service with maximum metal temperatures around 400°C. SA210 A1 contains higher carbon (≤0.27%) and delivers tensile strength ≥415 MPa for applications requiring greater creep resistance and higher allowable stress. Selection should be driven by design pressure, metal temperature, and the applicable code stress values.
Q: What documentation accompanies each finned tube bundle?
Standard delivery includes Mill Test Certificates (EN 10204 3.1) covering chemical composition and mechanical properties, dimensional inspection reports, hydrostatic test records, and fin pull-off test data. Third-party inspection (SGS, BV, TÜV) is available on request.
Contact
For a quotation, technical datasheet, or dimensional drawing of ASME SA179 / SA210 A1 G-Type finned tube bundles for air cooled heat exchangers, contact Yuhong Group Co., Ltd. at vladimir@steelseamlesspipe.com
