EN10217-7 1.4301 Extrudded Finned Tube with Al1060 Fins for HRSGs System

EN10217-7 1.4301 Extrudded Finned Tube with Al1060 Fins for HRSGs System

EN10217-7 1.4301 Extruded Finned Tube with Al1060 Fins is a high-performance, pressure-rated heat exchanger tube where:

• The inner pressure-bearing tube is made of stainless steel AISI 304 (1.4301), manufactured and tested according to the strict pressure vessel tube standard EN 10217-7. This makes it suitable for steam, hot water, or other process fluids under pressure.
• The outer heat transfer fins are made of high-conductivity, commercially pure aluminum (Al1060).
• The fins are extruded from a sleeve, creating a durable, monolithic finned structure with no gaps or weak joints.

Here are some detailed breakdowns:

1. Base Tube:

(1) EN 10217-7 1.4301 (AISI 304) – Chemical Composition

The composition is specified for the steel product (tube). Values are maximum percentages unless a range is given.

Key Point: The 1.4301 grade is synonymous with AISI 304. For seamless/welded pressure tubes under EN 10217-7, the specific limits above are mandated to ensure consistent performance.

(2) EN 10217-7 1.4301 (AISI 304) – Mechanical Properties

Properties are specified for the finished tube in the delivery condition (typically annealed). The standard defines minimum requirements.

2. Fins: Al1060 Extruded Fin

"Extruded" Process: A specialized machine uses tremendous pressure to roll or extrude the aluminum sleeve, forcing the aluminum to flow and form a tight, continuous helical fin from the aluminum itself. This creates a strong, integral, metallurgical bond between the fin and the tube with excellent heat transfer characteristics.

Al1060: This is a designation for commercially pure aluminum (at least 99.6% aluminum).

Key Properties:

• Excellent Thermal Conductivity: Aluminum is chosen primarily for this reason—it transfers heat from the base tube to the fin surface very efficiently.
• Good Corrosion Resistance: Forms a protective oxide layer.
• High Formability/Malleability: Essential for the extrusion process.
• Lightweight & Cost-Effective: Compared to making the fins from stainless steel.

3. Key Advantages of This Specific Combination:

• Corrosion Resistance (Internal): The 1.4301 tube resists corrosion from the internal fluid.
• Pressure Integrity: The tube meets a recognized pressure equipment standard.
• High Efficiency: The aluminum fins provide outstanding heat dissipation.
• Robust Bond: The extruded fin ensures long-term thermal performance without loosening.
• Cost Optimization: Using expensive stainless steel only where needed (for pressure/corrosion) and cheaper, more conductive aluminum for the fins.

Core Application Principle

This tube is designed for industrial heat exchangers where a pressurized fluid (liquid or gas) inside the tube needs to reject heat to ambient air (or another gas/air stream) flowing over the fins.

By Industry & Application

1. Power Generation

• Heat Recovery Steam Generators (HRSGs): Capturing exhaust heat from gas turbines to produce steam for a secondary steam turbine. These tubes often form the evaporator or economizer sections.
• Air-Cooled Condensers (ACCs): Condensing exhaust steam from a turbine in power plants located in water-scarce regions. The 1.4301 tube handles the steam/condensate, while Al fins maximize heat rejection to air.
• Feedwater Heaters & Deaerators: Pre-heating boiler feedwater using extracted steam. The pressure rating (EN10217-7) is critical here.

2. Oil, Gas & Petrochemical

• Process Fluid Coolers (Fin-Fan Coolers / Air Coolers): Cooling process streams (hydrocarbons, water, etc.) after distillation, cracking, or other reactions. The 1.4301 (304 SS) resists corrosion from many process chemicals and cooling water.
• Gas Compression Aftercoolers: Cooling hot compressed gases (e.g., natural gas) before they enter pipelines or next stages.
• Lube Oil & Seal Oil Coolers: Maintaining optimal oil temperature for large rotating equipment like turbines and compressors.

3. HVAC-R (Large Scale Industrial)

• Industrial Chiller Condensers: Rejecting heat from refrigerant to atmosphere.
• Heat Pump Coils: For large commercial or district heating/cooling systems.
• Thermal Storage Systems: As part of heat exchangers for large-scale energy storage.

4. Marine & Offshore

• Central Cooling Water Coolers: Using ambient air to cool the central fresh water loop that cools shipboard engines and equipment. The 1.4301 offers good resistance to marine atmospheres.
• LNG Heat Exchangers: In auxiliary systems for liquefied natural gas facilities.

5. General Industrial

• Waste Heat Recovery Units: Capturing and reusing heat from furnace exhausts, ovens, or dryers.
• Hydraulic Oil Coolers: For heavy machinery in steel mills, plastic injection molding, etc.