- Product Name: Fin Tube Serrated Machine | Serrated Fin Serration Machine | Serrated Finned Tube Machine
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The following is Datang’s precise maintenance of the technical specifications and formats of fin tube serrated machine:
️ I. Material Properties & Standards Compliance
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ASTM A106 Gr.B Carbon Steel Core Specifications
- Chemical Composition: Carbon ≤0.30%, Manganese 0.29-1.06%, Sulfur/Phosphorus ≤0.035% – ensures high-temperature pressure integrity.
- Mechanical Performance: Tensile strength ≥415 MPa, Yield strength ≥240 MPa, operational range -28.9~565°C.
- Corrosion Vulnerability: Requires zinc plating, epoxy coating, or sacrificial anode protection.
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Serrated Fin Structural Advantages
- Turbulence Enhancement: Serrated edges disrupt boundary layers, increasing heat transfer coefficients by 40-60% vs. bare tubes.
- Anti-Fouling Design: Fin pitch ≥2.5mm minimizes particulate accumulation.
️ II. Manufacturing & Performance Enhancement
| Process Stage | Key Parameters | Performance Impact |
|---|---|---|
| Base Tube Forming | Hot-rolled seamless process (1100~1200°C) | 30% higher pressure resistance |
| Fin Attachment | High-frequency welding/cold winding (45°±2° helix), fin height 1.0-2.5mm | Fin-tube bond strength ≥210 MPa |
| Surface Protection | Triple-layer: Sandblasting → Epoxy primer → Zn/Al coating | Service life extended from 2 to 8 years (sour environments) |
Critical Process Controls:
- Minimum bend radius ≥2×OD prevents root cracking;
- Laser welding mitigates intergranular corrosion in heat-affected zones.
???? III. Thermodynamic Performance & Engineering Adaptation
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Heat Transfer Quantification
- Area Multiplier Effect: Fin ratio β=2.8~3.5 provides 5-8× effective surface area, boosting heat exchange >50%;
- Case Study: Petrochemical condenser (DN32 saw-tooth tube, 1.8mm H/2mm P) reduced steam consumption by 22%.
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Harsh Condition Resilience
- Flue Gas Applications: Aluminized fins withstand ≤450°C gas with ≤30g/Nm³ dust;
- High-Viscosity Fluids: Serrated fins disrupt viscous boundary layers (>200 cP crude oil).
️ IV. Application Limits & Maintenance Protocols
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Design Restrictions
- Slurry services require fin pitch ≥3mm + flow velocity >2 m/s;
- Internally enhanced tubes preferred when h> 1.8×ho.
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Lifespan Preservation
- Cleaning Protocol: Hydrochloric acid prohibited; use 5% citric acid at 60°C±5°C;
- Welding Exclusion: No welding within 50mm of finned sections.
???? Typical Applications
- Chemical Processing: Distillation reboilers (316L-clad carbon steel hybrid);
- Power Generation: Boiler air preheaters (zinc-plated for sulfur resistance);
- Industrial Heating: Workshop radiators (>90% efficiency at -30°C).
Datang produces various fin tube machines, such as Extruded Fin Tube Machine, L Type Fin Tube Machine, High Frequency Welded Fin Tube Machine, Crimped Fin Tube Machine, Low Fin Tube Machine, Embedded G Type Fin Tube Machine,Laser Welded Fin Tube Machine