ASTM B163 N08800 Extruded Finned Tube With Al1060 Fins for Air Cooler and

Product Specification

ASTM B163 N08800 Extruded Finned Tube With Al1060 Fins for Air Cooler and Condenser

Product Overview

This bimetallic extruded finned tube adopts seamless UNS N08800 Incoloy 800 alloy base tube manufactured fully complying with ASTM B163 heat exchanger tube standard, matched with industrial pure Al1060 aluminum outer fins integrated by cold extrusion forming. Different from traditional wound or welded fin structures, our one-piece extrusion molding locks aluminum fins tightly onto the alloy substrate without gaps, eliminating interface thermal resistance and galvanic corrosion risks. The inner N08800 alloy bears high-temperature corrosive fluid medium, while outer Al1060 fins maximize air-side heat exchange area, forming a dual-performance heat exchange component that balances high temperature resistance, anti-corrosion capacity and ultra-high heat transfer efficiency.

Core Material Configuration & Unique Performance Advantages

1. Chemical Composition of ASTM B163 N08800 seamless pipe (Weight %, ASTM B163 Standard Limits)

Mechanical Properties of ASTM B163 N08800 seamless pipe (Solution Annealed Condition, ASTM B163 Seamless Tube)

Supplementary Note for ASTM B163 N08800

2. Outer Fins: Integral Extruded Al1060 Pure Aluminum Fins

We select 1060 industrial pure aluminum with ≥99.6% aluminum content for external fin molding via high-pressure cold extrusion, rather than sleeved or wrapped fins.

• Superior thermal conductivity: Al1060 ranks top among common aluminum alloys for heat conduction, rapidly transferring heat from alloy base tube to air flow, cutting equipment energy consumption for cooling/heating circulation.
• Full encapsulation protection: Extruded aluminum layer completely wraps the outer wall of N08800 tube, forming a protective barrier to isolate dust, moisture and weak corrosive air, slowing substrate surface oxidation.
• Ultra-stable bonding structure: Fin and tube form an integrated metal transition layer under extrusion pressure; no loosening, separation or gap expansion after repeated thermal cycling, stable heat transfer coefficient in long-term operation. High-pressure water washing and dust cleaning will not deform or peel fins, greatly lowering equipment maintenance frequency.
• Lightweight design: Low aluminum density reduces overall equipment dead weight, simplifying transportation, installation and frame load design for air coolers.

3. Manufacturing Process – Extruded Fin Technology

The extruded finned tube is manufactured through a specialized mechanical forming process where an aluminum sleeve is extruded over the base tube, creating a continuous, integral fin structure without joints or welds.

Key Process Features:

The aluminum outer tube is mechanically extruded over the N08800 base tube

Fins are formed from a continuous metal layer – no separate fin strip attachment

The aluminum fully encloses the base tube, providing complete external corrosion protection

This creates an excellent metallurgical bond with minimal contact thermal resistance

4. Comprehensive Strengths of Combined Bimetallic Extruded Finned Tube

• Zero gap heat conduction interface: No contact thermal resistance existing in wound fin tubes, heat exchange efficiency improved by 20%–35% compared with traditional finned pipes of same size.
• Dual anti-corrosion system: Inner N08800 withstands harsh chemical medium inside tubes; outer Al1060 fins resist atmospheric, rainwater and light industrial flue gas corrosion, suitable for complex working conditions where both internal high-corrosion fluid and external air cooling are required.
• Wide temperature matching range: Stable service from low-temperature refrigeration circulation up to 550℃ high-temperature waste heat recovery; aluminum fins can continuously work under 300℃ air-side temperature without softening failure.
• Customizable full-size parameters: Freely adjust tube outer diameter, wall thickness, fin height, fin pitch, fin thickness and single tube length as per client heat exchanger design drawings; support fixed-length cutting, end finishing and bending processing.
• Long service cycle: Resist vibration from fan air flow, thermal fatigue and frequent start-stop temperature fluctuation; far longer service life than carbon steel or stainless steel finned tubes in petrochemical, power and chemical waste heat recovery scenes.

5. Main Industrial Application Scenarios

This special alloy aluminum extruded finned tube targets high-end harsh working conditions that regular carbon steel or stainless steel finned tubes cannot adapt to, core application industries as below:

• Petrochemical Industry Effluent air coolers, sulfuric acid/nitric acid medium heat exchangers, ethylene reforming furnace waste heat recovery equipment, ammonia synthesis cooling systems, refinery process fluid air cooling condensers. N08800 effectively resists chloride ion corrosion and high-temperature hydrogen attack inside tubes.
• Power & Energy Generation Gas turbine waste heat boilers, nuclear auxiliary cooling heat exchangers, industrial boiler reheater auxiliary cooling components, thermal power plant flue gas waste heat recovery air coolers.
• Chemical & Pharmaceutical Processing Organic acid production liquid coolers, chemical digestion tank heating/cooling coils, waste incineration flue gas heat recovery devices, high-purity medium heat exchange equipment requiring non-contamination alloy substrate.
• Metallurgy & Heat Treatment Heat treatment furnace air cooling radiators, metal processing hydraulic oil high-temperature coolers, annealing furnace waste heat recycling units.
• Special Environmental Engineering Offshore platform process medium air coolers, coastal chemical factory anti-atmospheric corrosion heat exchange equipment, high-temperature industrial ventilation heating coils.