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| Brand Name: | Yuhong |
| Model Number: | ASTM A179 |
| MOQ: | 100KGS |
| Price: | Negotiable |
| Payment Terms: | L/C, T/T |
| Supply Ability: | 1000 ton/month |
Product Description
KL-type wound fin tubes are produced by tightly wrapping an aluminum strip around the base carbon steel tube under controlled tension. During the process, the base of the aluminum strip is simultaneously knurled and wound, ensuring a tight mechanical bond between the fin and the tube. This structure provides good heat transfer efficiency and prevents fin loosening during service. KL-type fin tubes are widely used in heat exchangers, air coolers, and condensers where cost-effective and efficient thermal performance is required.
Chemical Composition (ASME SA179 Base Tube)
| Element | C | Mn | P (max) | S (max) |
|---|---|---|---|---|
| Content (%) | ≤ 0.06 | 0.27–0.63 | 0.035 | 0.035 |
| Property | Requirement |
|---|---|
| Tensile Strength | ≥ 325 MPa |
| Yield Strength | ≥ 180 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 72 HRB |
| Element | Al | Si | Fe | Cu | Mn | Zn | Others (each) | Others (total) |
|---|---|---|---|---|---|---|---|---|
| Content (%) | ≥ 99.6 | ≤ 0.25 | ≤ 0.35 | ≤ 0.05 | ≤ 0.03 | ≤ 0.05 | ≤ 0.03 | ≤ 0.10 |
Fins Type:
KL-Type (Knurled + Wrapped)
Aluminum strip wound onto the tube with knurled base for enhanced bonding
Available in various fin heights and pitches as per design.
Fin Tube Types
| Feature / Type | L Type | KL Type | G Type | Extruded Type |
|---|---|---|---|---|
| Bonding Method | Wrapped, L-foot | Knurled + Wrapped | Groove + Embedded Fin | Aluminium Sleeve Extruded |
| Fin-Tube Contact | Moderate | Good | Excellent | Excellent |
| Heat Transfer | Moderate | Good | Good–Excellent | Excellent |
| Temperature Resistance | Low–Moderate | Moderate | High | High |
| Mechanical Strength | Fair | Better than L | High | Very High |
| Cost | Low | Low–Medium | Medium | High |
| Typical Use | Basic air coolers | General air coolers | Petrochemical / Refineries | Offshore / Harsh Environments |
Advantages
Economical and efficient finning method
Improved mechanical bonding between fin and tube compared to L-type
Good heat transfer efficiency
Suitable for moderate temperature applications
Widely applied in heat exchangers for air cooling, power generation, and petrochemical industries
