A335 P9 HFW Finned Tubes For High Temp Heat Exchangers Carbon Steel Fins
Price:
Negotiable
MOQ:
10PCS
Delivery Time:
Depends on quantity
Brand:
YUHONG
Product Description
High-Frequency Welded Finned Tubes (Base Tube: A335 P9 / Fins: Carbon Steel CS)
1. A335 P9 + CS Finned Tube Core Technology
High-frequency welded finned tubes integrate A335 P9 chromium-molybdenum alloy base tubes with carbon steel (CS) fins. This synergy delivers exceptional heat transfer efficiency (up to 98% weld integrity) and resistance to thermal stress (operating range: -50°C to 580°C). Ideal for high-pressure, corrosive industrial applications.
2. Precision Manufacturing Process
Our high-frequency welding (HFW) ensures metallurgical bonding without filler metals:
- Surface Prep: Base tube grit-blasted to Sa 2.5 (ISO 8501-1).
- Fin Winding: Fins spirally wound at 3–6 RPM under 150–300 MPa tension.
- HFW Bonding: 400–800 kHz frequency creates a seamless fin-to-tube interface.
- Post-Weld Treatment: Stress-relieved at 650°C ±15°C (ASME Section IX compliant).
3. Chemical Composition: ASTM-Compliant Materials
| Component | A335 P9 Base Tube (%) | Carbon Steel Fins (%) |
|---|---|---|
| Carbon (C) | 0.15 max | 0.25–0.35 |
| Chromium (Cr) | 8.0–10.0 | ≤ 0.40 |
| Molybdenum (Mo) | 0.90–1.10 | ≤ 0.15 |
| Silicon (Si) | 0.50–1.00 | 0.15–0.35 |
| Manganese (Mn) | 0.30–0.60 | 0.60–1.20 |
| Sulfur (S) | 0.025 max | 0.04 max |
4. Dimensional Tolerances: Precision Engineering
| Parameter | Base Tube (A335 P9) | Fins (CS) |
|---|---|---|
| Outer Diameter | ±0.20 mm | ±0.05 mm |
| Thickness | ±10% nominal | ±0.03 mm |
| Fin Height | N/A | ±0.15 mm |
| Fin Density | N/A | 150–400 fins/meter |
| Straightness | ≤1.5 mm/m length | ≤1.0 mm/m length |
5. High-Temperature Application Domains
- Power Generation: Boiler economizers (450–550°C), flue gas heat recovery.
- Petrochemical: Crackers, reformers, and sulfur recovery units (H₂S resistance).
- HVAC Systems: Industrial air preheaters (250–400°C).
- Renewable Energy: Biomass/waste-to-energy boilers (abrasion-resistant).
- Marine Engineering: Exhaust gas boilers (salt spray corrosion protection).
6. Advantages & Performance Validation
- Thermal Stability: P9’s 9% Cr content reduces oxidation at >540°C.
- Mechanical Strength: Tensile strength: ≥415 MPa (base), ≥310 MPa (fins).
- Corrosion Resistance: CS fins + P9 base withstand pH 3–12 environments.
- Quality Assurance: 100% eddy current testing, hydrostatic pressure checks (40 MPa).
- Proven Expertise: 12+ years supplying EU/NA power plants with zero field failure.
Why Choose Us?
✅ Customizable fin configurations (L-foot, embedded, serrated).
✅ ASME B36.10M, EN 10204-3.1 certified.
✅ Lead time: 30–45 days (MOQ: 500 meters).
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Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
Yuhong Group Co.,Ltd
Location
20TH FLOOR,NO.1 NEW WORLD BUILDING ,NO.1018 MINAN ROAD,YINZHOU DISTRICT, NINGBO CITY, ZHEJIANG PROVINCE, CHINA
Contact Person
Jikin Cai