Principle of Spheroidizing Annealing
The spheroidizing annealing furnace achieves spheroidization through three key steps:
(1) Heating to near the Ac1 temperature
This allows the lamellar cementite in the pearlite to begin to relax and decompose.
(2) Holding at the critical temperature
Maintaining the temperature near Ac1 for several hours allows the cementite to gradually spheroidize.
(3) Slow cooling
Slow cooling in the furnace allows for the stable formation of spherical carbides and a uniform microstructure.
The entire process requires precise furnace temperature control, a stable atmosphere, and strong convection; otherwise, spheroidization can be uneven. This is the important value of the spheroidizing annealing furnace.
| Applicable Processes | Spheroidized Annealing, Annealing, Quenching, Normalizing, Solid Solution; suitable for Steel, Stainless Steel, Copper & Copper Alloys, Aluminum & Aluminum Alloys |
| Load Capacity | Minimum 40 tons/batch, Maximum 70 tons/batch |
| Effective Loading Space | Width: 500–1,800 mm Height: 500–2,400 mm Length: 8,500–100,000 mm (customizable according to client requirements) |
| Customization | Can be tailor-made for special sizes or specific process requirements |
| Heating Power | 600–1,200 kW |
| Heating Source | Electric or Natural Gas |
| Protective Atmosphere | Nitrogen, Methanol Cracked Gas or RX Gas, Ammonia, or other protective gases |
| Electrical Control System | PC touch screen with professional heat treatment software, full-process automatic control |
| Atmosphere Control System | Oxygen probe, carbon potential control system, infrared gas analyzer, or Furnace Doctor monitoring system |
| Automation Level | Full-process automated operation; programmable heating, holding, and cooling; ensures uniform spheroidized structure and stable process |
Custom Spheroidizing Annealing Furnace Application
The spheroidizing annealing furnace is suitable for all high-carbon steel series that require improved machinability:
● Bearing steel (GCr15, etc.)
● High-carbon tool steel (T8/T10)
● Cold work die steel (Cr12, Cr12MoV)
● Cold heading steel, spring steel
● Wire rod, steel wire, steel strip
● Tool and mold blanks
● High-carbon bars and forgings
The entire process requires precise furnace temperature control, a stable atmosphere, and strong convection; otherwise, spheroidization can be uneven. This is the important value of the spheroidizing annealing furnace.
What Pain Points Can It Address?
The problems we most frequently hear from our customers are:
● Difficult machining and rapid tool wear
● Uneven spheroidization and significant batch variations
● Frequent customer complaints and inconsistent hardness
● Large furnace temperature deviations and low yield rate
● The need to re-develop processes after replacing equipment
Our spheroidizing annealing furnace is specifically designed to address these pain points.
FAQ
1.What materials can this furnace handle?
Steel, stainless steel, high-carbon steel, tool steel, copper & alloys, aluminum & alloys.
2.What is the load capacity?
40–70 tons per batch. Custom sizes available.
3.Can it be customized?
Yes. Width: 500–1,800 mm, Height: 500–2,400 mm, Length: 8,500–100,000 mm, or special sizes on request.
4.What heating options are available?
Electric or natural gas, 600–1,200 kW.
5.How is the protective atmosphere controlled?
Nitrogen, methanol cracked gas, RX gas, or ammonia; with oxygen probe & carbon potential control.
6.Key advantages?
Uniform heating, consistent spheroidized structure
Improved machining & reduced tool wear
Energy-efficient design
Flexible for multiple materials
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