Serrated Finned Tube HF Welding ASTM A335 P9 For Power Generation Boilers
Serrated Finned Tube HF Welding ASTM A335 P9 For Power Generation & Boilers
Chemical Composition (%)
| Grade | C | Mn | P | S | Si | Cr | Mo | Ni | V |
| P9 | 0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.25-1.00 | 8.00-10.00 | 0.90-1.10 | ... | ... |
Mechanical Properties
| Grade | Tensile Strength,min | Yield Strength (0.2%Offset,min) |
| P9 | 60ksi (415 MPa) | 30ksi (205 MPa) |
ASTM A335 this standard specification for seamless ferritic alloy-steel pipe for high-temperature service, is a critical material standard for fin tubes used in high-temperature and high-pressure applications, such as power plants, petrochemical refineries, and heat recovery systems.
P9 material has good oxidation & corrosion resistance and better than P11/P22. With excellent high-temperature strength (up to 600°C+) and superior creep resistance for long-term thermal cycling, P9 material is suitable for welding & fabrication (requires post-weld heat treatment).
Design Features Serrated Finned Tubes
Serrated Fins:The fins are serrated, increasing turbulence & heat transfer efficiency by ~20-30% vs. smooth fins and reduces ash fouling in flue gas applications.
Material:Usually carbon steel, stainless steel, alloy or copper, providing durability and resistance to corrosion.
Spiral Configuration:Enhance the heat transfer process.
Welding Process:High-FrequencyResistance Welding ensures strong metallurgical bonding.Post-Weld Heat Treatment (PWHT) required to relieve stresses.
Primary Application
Power plant superheaters
Refinery heaters & reformers
HVAC Systems
Waste heat recovery systems
Specifications For Various Types Of Finned Tubes We Can Do
| Type | Description | Base tube | Fin specification (mm) | ||
| O.D. (mm) | Fin pitch | Fin height | Fin thick | ||
| Embedded | G-type fin tube | 16-63 | 2.1-5 | <17 | ~0.4 |
| Extruded | Single metal / Combined metal | 8-51 | 1.6-10 | <17 | 0.2-0.4 |
| Low fin tube / T-type fin tube | 10-38 | 0.6-2 | <1.6 | ~0.3 | |
| Bamboo tube / corrugated tube | 16-51 | 8-30 | <2.5 | ~0.3 | |
| Wound | L / KL / LL type fin tube | 16-63 | 2.1-5 | <17 | ~0.4 |
| String | String fin tube | 25-38 | 2.1-3.5 | <20 | 0.2-0.5 |
| U-type | U-type fin tube | 16-38 | / | / | / |
| Welding | HF-welding fin tube | 16-219 | 3-25 | 5-30 | 0.8-3 |
| H/HH type fin tube | 25-63 | 8-30 | <200 | 1.5-3.5 | |
| Serrated spiral fin tube | 25-219 | 2-7 | <38.1 | 0.9-2.0 | |
| Studed fin tube | 25-219 | 8-30 | 5-35 | φ5-20 |
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