The soaking zone functions as the critical equalization phase for Titanium/Steel clad plates, tasked with harmonizing the temperature distribution across the material. It provides a high-temperature environment with minimal thermal fluctuations, allowing the plate to reach internal thermal equilibrium. By minimizing the temperature difference between the surface, the core, and the distinct metal layers, the soaking zone ensures that both materials possess consistent plastic deformation capabilities required for high-precision rolling.
The primary value of the soaking zone is not merely adding heat, but stabilizing it. It acts as a thermal buffer that eliminates the severe temperature gradients created during preheating, ensuring the Titanium and Steel layers behave uniformly under rolling pressure.
The Mechanism of Thermal Equilibrium
Minimizing Internal Gradients
When a Titanium/Steel clad plate enters the furnace, the preheating zone creates a significant disparity between the surface and the core. The surface heats rapidly via convection and radiation, while the core lags behind.
The soaking zone reverses this dynamic. By maintaining a stable temperature, it allows the accumulated heat to conduct thoroughly to the center, drastically reducing the cross-sectional temperature difference.
Regulating Core Temperature
The soaking zone is the most effective tool for manipulating the core temperature of the plate. Numerical simulations demonstrate a direct and efficient correlation between the furnace setting and the plate's core.
For every 5°C increase in the soaking zone temperature, the center temperature of the Titanium/Steel clad plate rises by an average of 4.5°C. This high transfer efficiency is vital for ensuring the core is soft enough for rolling without overheating the surface.
Impact on Rolling Capabilities
Ensuring Consistent Plastic Deformation
The ultimate goal of the heating process is to prepare the metal for deformation. Because Titanium and Steel have different physical properties, they react differently to heat.
The soaking zone ensures that both metal layers reach a unified thermal state. This synchronization ensures that when the plate hits the rollers, the plastic deformation is uniform across the entire thickness, preventing structural defects.
Reducing Thermal Stress and Delamination
Temperature gradients generate internal stress. If the difference between the surface and core—or the interface between the Titanium and Steel—is too high, the materials fight against each other.
By optimizing the residence time and gas temperature in the soaking zone, the process minimizes these stresses. This is the primary defense against interface delamination, where the two metals might separate due to conflicting thermal expansion or contraction.
Understanding the Trade-offs
The Risk of Aggressive Heating
While increasing the soaking zone temperature efficiently raises the core temperature, it is not without risk. Data indicates that aggressively raising the soaking temperature can inadvertently result in a slight increase in the cross-sectional temperature difference.
Balancing Speed vs. Uniformity
Operators must find an optimal balance between heating speed and temperature uniformity. Prioritizing speed (higher temps, shorter time) may achieve the target core temperature but leave residual gradients that compromise rolling precision.
Making the Right Choice for Your Goal
To optimize the quality of Titanium/Steel clad plates, you must tune the soaking zone parameters based on your specific operational constraints.
- If your primary focus is Flawless Bonding: Prioritize extended residence time over higher temperatures to ensure maximum thermal equilibrium and minimize interface stress.
- If your primary focus is Rolling Precision: Tightly control the soaking zone temperature stability to guarantee consistent plastic deformation across both metal layers.
- If your primary focus is Throughput Efficiency: Utilize the 5°C to 4.5°C ratio to elevate core temperatures quickly, but monitor cross-sectional gradients closely to avoid exceeding stress limits.
The quality of the final product depends less on how hot the furnace gets, and more on how uniformly the soaking zone distributes that heat across the clad layers.
Summary Table:
| Parameter/Function | Role in Clad Plate Quality |
|---|---|
| Thermal Equilibrium | Eliminates temperature gradients between surface, core, and metal interfaces. |
| Core Heat Transfer | Every 5°C increase in furnace temp raises plate core by approx. 4.5°C. |
| Plastic Deformation | Synchronizes metal layer behavior for uniform thickness during rolling. |
| Stress Management | Minimizes internal thermal stress to prevent interface delamination. |
| Operational Focus | Balances residence time and temperature for optimal bonding and throughput. |
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References
- Zhanrui Wang, Hui Yu. Numerical investigation on heating process of Ti/Steel composite plate in a walking-beam reheating furnace. DOI: 10.2298/tsci231108082w
This article is also based on technical information from Kintek Furnace Knowledge Base .
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