Continuous Bright Annealing Furnace Manufacturer for Stainless Steel Tubes

A bright annealing furnace is a specialised industrial furnace designed to perform annealing heat treatment on metals within a sealed, protective atmosphere; it is classified as precision heat treatment equipment. Unlike conventional annealing furnaces, it completely prevents atmospheric oxidation throughout the process. As a result, the treated metal workpieces require no subsequent acid washing or polishing; their surfaces remain clean, bright, free from oxidation and decarburisation, making it a core piece of equipment in the metal finishing industry.

The equipment utilises a sealed furnace structure to introduce hydrogen, nitrogen or a nitrogen-hydrogen mixed protective gas into the furnace, completely displacing the air inside and preventing oxygen from coming into contact with the high-temperature metal. Through electric heating, it precisely raises the temperature according to a preset process curve, maintains a constant temperature and cools down in a controlled manner to perform heat treatment on cold-worked metal materials. This process not only eliminates internal stresses, refines metal grain structure and optimises mechanical properties, but also preserves the surface lustre and material precision of the workpiece throughout the entire process.

1. Excellent Surface Quality: With inert/reducing atmosphere protection throughout the process, workpieces remain free from oxidation, blackening and decarburisation. After annealing, they immediately exhibit the metal’s natural lustre, eliminating the need for subsequent polishing or acid washing processes and reducing processing losses.

2. Uniform and Stable Performance: Equipped with a high-precision temperature control system, furnace temperature uniformity can be maintained within ±5°C, with high-precision models achieving ±2°C. Hardness, toughness and stress relief effects are consistent across the entire batch of workpieces, with minimal performance variation.

3. High process precision: Temperature control accuracy of ±1–3°C allows precise adaptation to the annealing requirements of various metallic materials. Stress relief efficiency exceeds 90%, effectively resolving deformation and cracking issues arising from metal stamping, drawing and bending.

4. Energy-efficient automation: Most models employ a sealed insulation structure and air circulation design, resulting in high thermal efficiency. Combined with automated start/stop, temperature control and ventilation systems, they enable stable continuous or batch production, meeting the demands of industrial mass production.

1. Continuous Bright Annealing Furnace
This is an assembly line operation, where workpieces pass continuously and at a constant speed through the heating, holding, cooling and unloading stations, with a very high degree of automation. It is primarily suited to large batches of long, strip-shaped or coiled workpieces, such as stainless steel strips, steel wire, copper tubes and precision wire, and is widely used in large-scale metal processing production lines. Tubular bright annealing furnaces are a sub-type of this category, specifically designed for the continuous annealing of various metal bars and wires.

2. Chamber/Bell-Type Bright Annealing Furnaces
These are batch-processing equipment operating on an intermittent basis. Featuring a highly sealed furnace chamber, they are suitable for small batches, irregularly shaped and large workpieces, such as precision hardware components, moulds, small alloy workpieces, and coiled copper and steel materials. The equipment offers high flexibility and can accommodate customised annealing processes for workpieces of various specifications and categories.

Widely used for finishing annealing of various ferrous and non-ferrous metals, the core applicable materials include: stainless steel, carbon steel, alloy steel, copper and copper alloys, aluminium and aluminium alloys, silicon steel, etc. Common application scenarios cover precision hardware manufacturing, tube and wire processing, electronic components, new energy metal fittings, automotive precision components and other fields, primarily addressing issues such as excessive hardness, susceptibility to cracking, residual internal stresses, and surface oxidation and blackening after metal processing.