Tianli aluminum roll annealing furnace is a batch-type heat-treatment unit specially designed for aluminum and aluminum-alloy coils, strips and foils. Annealing softens cold-worked aluminum, relieves work-hardening internal stresses and restores ductility for further forming, stamping and rolling.
The furnace follows a complete "heating – soaking – controlled cooling" curve for recrystallization annealing, and is equipped with a nitrogen protective atmosphere system. Nitrogen filling prevents high-temperature oxidation (surface staining) of the aluminum surface, while diluting combustible oil vapor evaporated from rolling oils to eliminate fire and explosion risks.
Backed by Tianli’s experience since 2003 and more than 200 national patents, the steel structure, refractory insulation, hot-air circulation fans, nitrogen atmosphere system and full electrical control system are all designed and manufactured in-house. Standard chamber size: 9000 × 2600 × 3200 mm (L × W × H), customizable to coil OD/ID, coil weight and plant layout. Serving aluminum sheet/strip/foil processing, automotive lightweight, aerospace and new-energy industries, and exported since 2015 to Russia, UAE (Dubai), Thailand, Vietnam, Oman and other countries.
The hermetically sealed chamber is filled with high-purity nitrogen during annealing to keep an inert atmosphere, preventing yellowing, staining and surface defects on the aluminum. Nitrogen also dilutes rolling-oil vapor below the lower explosion limit. In-line oxygen and nitrogen-flow monitoring with automatic makeup and over-limit interlocks ensure safe operation.
Heating rate, soaking temperature, holding time and cooling rate are fully programmable. Natural or forced circulation cooling is available to avoid excessive radial temperature difference that could cause coil distortion and inconsistent properties, ensuring uniform mechanical properties across the whole coil.
High-power circulation fans with optimized ducts force airflow evenly through the coil pack. Small transverse and longitudinal temperature deviation ensures consistent annealing quality across coils and within each coil.
The complete set automatically manages heating, fans, nitrogen purge, furnace-door movement and temperature recording:
• HMI touch-screen with multiple stored recipes for different alloys and coil sizes; one-click automatic process execution.
• Comprehensive safety interlocks: overtemperature protection, thermocouple break alarm, oxygen-over-limit alarm, low nitrogen pressure alarm, door/trolley limits and emergency stop.
• Automatic logging of temperature curves, nitrogen consumption and fault records with data export for aluminum-processing quality traceability.
• Key components from Schneider Electric, ABB, Siemens, Delta and Yudian (Xiamen), with worldwide spare-part support for overseas projects.
Chamber size and configuration can be tailored to coil OD/ID, single-coil weight, number of coils per batch, plant layout and utility conditions. Options include trolley charging, rapid cooling unit and upper-computer monitoring. Backed by long-term cooperation with research institutes and universities, Tianli provides process support for special aluminum alloys, reliable after-sales service and long-term spare-parts supply.
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