A335 P9 HFW Finned Tubes For High Temp Heat Exchangers Carbon Steel Fins

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

4. Dimensional Tolerances: Precision Engineering

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).