A335 P11 HFW Serrated Finned Tube with GR.11 Fins - Boiler & HRSG Applications

High-Frequency Welded Serrated Finned Tubes Base Tube: ASTM A335 P11 | Fins: Aluminum Alloy GR.11

1. Product Overview

High-frequency welded serrated finned tubes combine ASTM A335 P11 chromium-molybdenum alloy steel base tubes with aluminum alloy GR.11 fins via advanced HFW technology. Designed for extreme conditions (≤600°C), they deliver 30%+ higher thermal efficiency than smooth tubes.

2. Material Composition (ASTM-Compliant)

Table: Chemical Properties

Key Material Advantages:

• P11 Base Tube: High creep strength (60ksi yield) & oxidation resistance.

• GR.11 Fins: Anti-corrosion (salt spray >1,000hrs), thermal conductivity 200W/m·K.

3. Structure & Manufacturing Process

• Base Tube: Seamless, OD 15.88-50.8mm, Thickness 2.0-4.5mm

• Fins: Serrated edge (enhances turbulence), Height 12-20mm, Thickness 0.3-0.5mm

• Embedding Process:

HFW Technology: Fin-to-base bond strength >100MPa (per ASTM E8)

Helical Pitch: 3-10 fins/inch (customizable)

100% Weld Penetration: Ensures zero thermal contact resistance

4. Precision Tolerances

Table: Dimensional Standards (ASME B36.10)

5. Performance Advantages

• Heat Transfer: 8-12x surface area expansion vs. bare tubes

• Fouling Resistance: Serrated fins disrupt boundary layers

• Pressure Integrity: P11 base tube rated for 15MPa @ 450°C

• Corrosion Protection: GR.11 forms Al₂O₃ protective layer

6. Application Industries

7. Why Choose Our Finned Tubes?

• Certified Quality: EN 10204 3.1, ASME Section II, ISO 9001:2015

• Custom Engineering: Fin density/height tailored to fluid properties (gas/oil/steam)

• Proven Longevity: >60,000 service hours in refineries (API 530 compliant)

• Global Supply: 500+ tons/month capacity, lead time ≤30 days