Description
The billet secondary heating furnace is designed for reheating steel billets after initial preheating, ensuring they reach the optimal rolling temperature in modern steel mills.
Also called a billet secondary temperature maintenance furnace or billet reheating furnace, this equipment is essential for continuous casting and rolling lines where billets have cooled during storage or transport.
With precise PLC-controlled induction heating, the billet secondary heating electric furnace achieves uniform temperature, minimal surface oxidation, and energy-efficient operation.
🔹 Challenges in Secondary Billet Heating
After initial preheating, billets may lose heat while waiting for rolling, leading to:
* ❌Uneven billet temperature
* ❌Surface oxidation or decarbonization
* ❌Delays in rolling production
* ❌Increased energy consumption
Modern billet secondary reheating furnaces address these issues, providing rapid and uniform billet reheating before entering the rolling mill.
🔹 Billet Secondary Heating Furnace Solution
The billet secondary heating furnace uses medium-frequency electromagnetic induction to quickly reheat billets:
* Maintains a consistent billet temperature for optimal rolling
* Reduces surface oxidation compared with traditional fuel-fired billet reheating furnaces
* Integrates with automatic feed and rolling systems for uninterrupted production
Yuantuo billet secondary temperature maintenance furnace supports a wide range of billet sizes and lengths and is fully compatible with continuous casting and rolling lines.
🔹 Advantages of Billet Secondary Heating Equipment
✅ Energy-efficient: uses 40–110 kWh per ton, much lower than conventional fuel-fired systems
✅ Reduced oxidation: surface scale typically ≤0.5%
✅ Uniform heating: eddy currents provide internal billet heating
✅ Precise temperature control: PLC closed-loop system with infrared monitoring
✅ Fast response: short reheating cycles improve overall rolling line efficiency
✅ Flexible configuration: supports square and round billets, various lengths
The billet secondary heating electric furnace is ideal for mills aiming for high billet quality, energy savings, and process stability.
🔹Working Principle of Billet Secondary Reheating Furnace
The billet secondary reheating furnace operates by converting AC power to medium-frequency current:
1. Induction coils generate a high-density magnetic field
2. Eddy currents inside the billet produce uniform internal heat
3. Heating is controlled automatically based on billet entry temperature and speed
Compared with traditional billet reheating furnaces, the billet secondary heating electric furnace provides faster, cleaner, and more controllable billet reheating.
🔹 Technical Specifications
* Power: 1000–12000 kW
* Frequency: 500–1200 Hz
* Capacity: 40–300 tons/hour
* Billet size: 60–200 mm square
* Length: 3–12 meters
* Energy consumption: 40–110 kWh per ton
* Control system: PLC + Infrared temperature closed-loop
🔹 System Components
* Medium-frequency induction power supply
* Heating coil system
* Billet feeding and conveying system
* Infrared temperature measurement system
* PLC control system (Siemens S7 recommended)
* Cooling system and auxiliary support
The billet secondary temperature maintenance furnace ensures precise reheating with minimal operator intervention.
🔹 Applications
The billet secondary heating furnace is widely applied in:
* Steel billets that require reheating after cooling
* Continuous casting billet lines
* Carbon steel and alloy steel billets
* Semi-finished billet rolling
* High-speed rolling lines where precise temperature control is critical
🔹 Conclusion
The billet secondary heating furnace (also known as billet secondary temperature maintenance furnace or billet reheating electric furnace) provides:
* Uniform billet reheating
* Reduced oxidation and energy consumption
* Precise and stable billet temperature control
* High reliability for continuous rolling lines
It is an essential solution for modern steel mills that require high-quality billet reheating and optimized energy efficiency.
