China Industrial Continuous Annealing Furnace for Sale – Best Price

A continuous annealing furnace is a type of metal heat treatment equipment designed for continuous, assembly-line operation, and represents the mainstream production model among annealing furnaces.

Unlike intermittent annealing furnaces such as bell-type or box-type furnaces, it does not require shutdown for loading or unloading. Instead, it utilises a traction conveying mechanism to move metal strip, wire and tubing at a constant speed and without interruption through the various temperature zones within the furnace, thereby continuously completing the entire process of preheating, heating and holding, annealing, cooling and unloading. When combined with a protective atmosphere, this enables bright, oxidation-free continuous annealing.

Continuous Annealing Furnace

The continuous annealing furnace operates on the principle of automated annealing, utilising continuous conveyor-belt transport, zone-specific temperature control and atmosphere protection.

The equipment utilises a traction drive system to feed strip, wire and tube materials into the sealed furnace chamber at a constant, uninterrupted speed. The furnace interior is divided into distinct zones according to the process: a preheating zone, a high-temperature heating and holding zone, a slow-cooling zone and a final cooling zone. Through precise temperature control in each section, the metal materials undergo a complete annealing process—including heating, grain recrystallisation, stress relief and uniform cooling—in accordance with standard process curves.

Simultaneously, nitrogen, a nitrogen-hydrogen mixture or pure hydrogen is continuously introduced into the furnace as a protective atmosphere, completely displacing the air inside and isolating the metal from oxygen. This prevents oxidation, decarburisation and blackening of the metal at high temperatures, ultimately achieving an annealing result characterised by continuous, uninterrupted mass production, a bright surface finish and the complete elimination of internal stresses.

1. Consistent & stable quality – Multi-zone temperature control ensures uniform hardness, gloss, and flatness; high yield.

2. High efficiency & mass production ready – Continuous 24/7 operation, no downtime for loading/unloading or heating/cooling.

3. Excellent surface finish & cost saving – Protective atmosphere prevents oxidation; eliminates pickling/polishing steps, reducing cost and environmental burden.

4. Superior material properties & full stress relief – Optimized annealing curve removes residual stress, refines grain, improves ductility and flexibility.

5. Highly automated & low labor cost – Fully automatic control of temperature, speed, and atmosphere; minimal manual intervention.

6. Energy efficient & eco-friendly – Continuous isothermal operation avoids heat loss; no acid/alkaline wastewater pollution.

7. Stable performance for high-end manufacturing – Stored process parameters ensure long-term consistency; meets precision requirements of automotive, electronics, and new energy industries.