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CDOCAST protective-atmosphere annealing furnaces provide programmable resistance heating, nitrogen or nitrogen-hydrogen atmosphere control and rapid water cooling for gold, silver, platinum, copper and suitable alloy workpieces.
A precious metal annealing furnace heats cold-worked metal to a controlled temperature so internal stress can be reduced and ductility can be restored before further rolling, drawing, stamping, forming or polishing. Unlike open-flame annealing, the enclosed chamber provides repeatable temperature control and a managed protective atmosphere. The video above lets buyers see the real batch workflow before comparing an annealing furnace manufacturer or requesting an annealing furnace quotation.
CDOCAST uses high-temperature resistance-wire heating around the chamber for more uniform heat distribution. Nitrogen protection or a nitrogen-hydrogen reducing atmosphere helps limit oxidation, while the integrated cooling tank shortens handling between heating and quenching.
Choose the chamber format from the workpiece dimensions, batch quantity, required atmosphere and production method—not from furnace power alone.
The standard protective-atmosphere furnace for flexible batches of precious-metal sheet, strip, rods and small components.
A longer heating zone for larger workpieces or increased batch loading where the standard CDO-AF16 chamber is too short.
A channel-style configuration for longer products and customers who need more loading length or a production-oriented workflow.
These are the standard specifications currently published for the compact batch model.
| Model | CDO-AF16 |
|---|---|
| Power supply | Three-phase 380 V ±10%, 50/60 Hz |
| Rated power | 16 kW |
| Maximum temperature | 1000°C |
| Temperature fluctuation | Within ±2°C after the set temperature stabilizes |
| Heating zone | 450×200×100 mm (L×W×H) |
| External dimensions | 850×1800×1200 mm (L×W×H) |
| Machine weight | 350 kg |
| Protective atmosphere | Ammonia dissociation gas, nitrogen or nitrogen-hydrogen mixture |
| Protective-gas flow reference | 6–8 L/min |
| Heating principle | High-temperature resistance-wire heating |
| Chamber material | High-temperature refractory material |
| Metal chamber and furnace-door material | 310S stainless steel |
The useful advantage is not temperature alone; it is how heating, atmosphere protection and handling work together.
Heating elements are arranged around the chamber to reduce hot spots and improve consistency across the loaded workpieces.
Operators can set heating programs for different metals, thicknesses, batch sizes and annealing requirements.
Nitrogen or a suitable nitrogen-hydrogen mixture helps limit oxygen contact and reduce scale during annealing.
An optional system produces a nitrogen-hydrogen atmosphere for customers seeking brighter surfaces and lower gas operating cost.
The workpiece rack can be transferred to the adjacent cooling tank after heating, shortening the batch handling cycle.
Scheduled start-up and a workshop-friendly footprint support routine production without an unnecessarily complex line.
These details help buyers evaluate the machine beyond the maximum-temperature number.
The heat-resistant chamber and movable loading rack are arranged so hot workpieces can be transferred efficiently to the adjacent water-cooling tank after annealing.
A combustion device at the entrance and slight positive pressure inside the chamber help reduce outside-air ingress and improve atmosphere stability during bright annealing.
The same furnace can serve different products when chamber size, loading density, temperature, hold time, atmosphere and cooling are correctly matched.
A useful annealing furnace quotation should be based on the actual workpiece and production target.
Choose a dedicated system when the product form or required production method differs from batch chamber annealing.
Review the standard CDO-AF16 layout and provide your workpiece size and output when requesting a quotation.
Answers to the questions buyers most often ask before selecting a precious metal annealing furnace.
It can anneal gold, silver, platinum and other precious metals, as well as suitable copper, brass and stainless-steel workpieces. Common forms include rods, tubes, wire, sheet, strip, plate and small components.
The published CDO-AF16 options include nitrogen, a nitrogen-hydrogen mixture and gas produced by an optional ammonia dissociation system. Gas choice depends on the alloy, desired surface brightness and workshop safety provisions.
It is optional. Buyers can select a furnace with or without the ammonia dissociation unit. The option produces nitrogen and hydrogen, supporting oxidation control and a reducing atmosphere for brighter surfaces.
The standard CDO-AF16 maximum temperature is 1000°C. The correct operating temperature is lower for many processes and must be selected from the metal, alloy, thickness, load and required properties.
The CDO-AF16 heating zone is 450×200×100 mm. An extended 450×800×238 mm chamber and a 1 meter channel format are shown as alternative configurations for larger or longer workpieces.
After reaching and stabilizing at the set temperature, the published temperature fluctuation is within ±2°C. Actual workpiece uniformity also depends on loading density, placement, chamber size and process settings.
After annealing, the loaded rack can be pushed and rotated so workpieces enter the adjacent water tank for rapid cooling. The cooling method should still be selected for the alloy and required metallurgical result.
Provide the metal or alloy, workpiece dimensions, batch weight, daily output, required temperature, protective atmosphere, cooling method, factory voltage and workshop utilities. These details determine the chamber, power and gas-system configuration.
Send CDOCAST your material, workpiece dimensions, batch output, temperature and preferred atmosphere for a practical machine recommendation.