An Aluminum Profile Aging Furnace is the final thermal treatment station in the extrusion process. While the extrusion press shapes the metal, the aging furnace “hardens” it.
Most aluminum alloys (especially the 6000 series like 6061 and 6063) are relatively soft after extrusion. The aging furnace uses a process called Precipitation Hardening to bring the aluminum to its required structural strength and “T5” or “T6” temper.
Precipitation Hardening: By heating the aluminum to a specific temperature (usually 170°C to 210°C) and holding it there for several hours, alloying elements (like magnesium and silicon) form fine particles that “lock” the metal’s grain structure, increasing its hardness.
Structural Stabilization: It removes residual stresses from the extrusion and stretching processes, ensuring the profiles don’t warp or change shape later during CNC machining or assembly.
Consistency: It ensures that every profile in a large batch has the exact same mechanical properties (tensile strength and yield strength).
Aging furnaces are categorized by how they move the air and how they are loaded.
A. Single-Door Batch Ovens
The most common model. Profiles are loaded onto “aging trolleys” and pushed into a large chamber.
Best for: Standard production where different profiles require the same aging cycle.
B. Double-Door (Pass-Through) Ovens
Profiles enter through one door and exit through the opposite door.
Best for: 10-inch lines with a linear factory layout to prevent “bottlenecks” and crossover traffic.
C. Multi-Billet / Continuous Aging Ovens
A more advanced system where profiles move slowly through a long heated tunnel.
Best for: Extremely high-volume, single-product factories (e.g., dedicated automotive component plants).
D. Vertical Aging Furnaces
Used primarily for very long profiles or specialized aerospace parts to prevent “sagging” under their own weight.
| Type | Gas-Fired Convection Oven | Electric Resistance Oven |
| Advantages | Low Operating Cost: Gas is typically cheaper for heating large volumes of air. Fast Heat-up: Higher BTU output. | Precise Control: Temperature uniformity within $\pm$ 3°C. Clean: No combustion byproducts (safer for high-finish surface). |
| Disadvantages | Uniformity Challenges: Requires complex ductwork to prevent “hot spots.” Maintenance: Burners and gas lines need regular safety checks. | High Cost: Electricity is more expensive per unit of heat. Slower: Takes longer to reach target temperature. |
| Best For | Standard 10-inch Industrial Lines | Aerospace / High-Precision Electronics |
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If you are presenting to buyers at ARABAL or ALUMINUM USA, here are the “Director-level” technical features you should highlight:
Air Circulation Technology: For 10-inch profiles, the metal mass is huge. You must suggest a model with High-Velocity Cross-Flow Fans. If the air doesn’t move fast enough, the profiles in the center of the stack won’t reach the required temperature, resulting in “soft” metal that fails safety tests.
Energy Efficiency (The “Green” Factor): Modern furnaces use thicker rock-wool insulation (150mm–200mm) and heat recovery systems. In markets with high energy costs (like Europe or North America), this is a major selling point.
T5 vs. T6 Temper: * T5: Air cooled at the press + Aging.
T6: Water quenched + Aging.
Ensure the furnace you propose has a PLC capable of storing multiple “recipes” so the client can switch between these tempers easily.
Comparison of Aging Cycles
Alloy Temperature Duration (Typical) Resulting Hardness (Webster)
| Alloy | Temperature | Duration (Typical) | Resulting Hardness (Webster) |
| 6063 | 180°C – 190°C | 4 – 6 Hours | 10 – 12 |
| 6061 | 175°C – 185°C | 8 – 10 Hours | 15+ |
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