No.
In a continuous casting and rolling process, billets may still contain considerable residual heat when they reach the reheating section. However, the actual inlet temperature, temperature distribution along the billet and thermal condition across the section may vary.
The purpose of a billet temperature compensation system is therefore not simply:
“Heat the billet to a higher temperature.”
The system needs to determine how much additional heat is required according to the actual billet condition and raise the billet to the required temperature for the downstream rolling process within the available production time.
At the same time, the heating section must operate in coordination with the rolling mill.
For this reason, simply providing:
“The billet size is 150 × 150 mm.”
is normally not enough to determine the complete induction heating solution.
Inlet temperature is one of the first parameters that should be confirmed for a billet temperature compensation project.
Consider the same billet specification under two production conditions:
Condition A: Inlet temperature approximately 800°C
Condition B: Inlet temperature approximately 650°C
If both billets need to reach the same target temperature before rolling, the amount of additional heat required will clearly be different.
Therefore, engineers normally need to know:
The temperature difference between the actual inlet condition and the target rolling condition is an important basis for calculating the required heating capacity.
This means that two billets with exactly the same cross-sectional dimensions do not necessarily require the same heating power or effective heating length.
Online temperature measurement is an important part of a billet reheating line, but a single outlet temperature reading does not describe the complete heating condition.
During continuous production, engineers also need to consider:
This becomes particularly important for larger billet sections.
If the effective heating time is insufficient, a surface temperature reading alone may not fully represent the thermal condition across the billet section.
For this reason, heating capacity, effective heating time, online temperature measurement and conveying speed should be considered as part of one integrated system.
For continuous industrial production, reaching the target temperature is only one requirement.
Another important question is:
Can the system continuously reach the required temperature at the specified tons per hour?
Consider billets with the same dimensions and material grade.
If one production line requires 10 t/h and another requires 20 t/h, the amount of steel passing through the heating section per unit time changes significantly.
Engineers therefore need to reevaluate:
This is why required capacity in t/h is an essential parameter when designing an induction billet heating system.
A billet temperature compensation line usually does not operate as an isolated process.
In continuous casting and direct rolling applications, both the upstream billet supply and the downstream rolling mill have their own production rhythms.
A typical process sequence may be:
Billet Feeding → Inlet Temperature Measurement → Induction Temperature Compensation → Outlet Temperature Measurement → Temperature Confirmation → Rolling Mill
Therefore, billet conveying speed should not be determined by the induction heating section alone. It must also match the required rolling mill production takt.
If the rolling mill temporarily stops or its production speed changes, the control strategy may also need to consider:
This is one reason why a billet heating before rolling system should be engineered as part of an integrated production process rather than as an isolated heating machine.
In actual production, billet temperature is not always completely uniform.
During conveying and waiting, temperature differences may develop due to:
For this reason, a billet reheating or temperature compensation system should not focus only on the average outlet temperature.
The required temperature uniformity should also be considered according to the downstream rolling process.
For billets with different section sizes, materials and inlet temperatures, engineers need to coordinate:
The objective is not simply to obtain one acceptable temperature reading.
The objective is to provide the rolling mill with billets under more stable and suitable thermal conditions for continuous rolling.
For an initial engineering evaluation, it is recommended to provide:
| Parameter | Information Required |
|---|---|
| Billet Type | Square billet, rectangular billet, round billet, etc. |
| Cross Section | Width × height or diameter |
| Length | Minimum, maximum and common length |
| Material | Steel grade |
| Inlet Temperature | Minimum, normal range and fluctuation |
| Target Temperature | Required temperature before rolling |
| Production Capacity | t/h |
| Rolling Mill Takt | Rolling speed and production rhythm |
| Conveying System | Existing roller conveyor and line connection |
| Plant Conditions | Available installation space and current layout |
If multiple billet specifications need to be processed, it is also useful to provide the commonly produced sizes, production share of each size and changeover frequency.
These parameters provide a much stronger basis for customized engineering than billet cross-sectional dimensions alone.
The engineering logic of a complete billet temperature compensation line should normally follow:
Billet Size & Material → Actual Inlet Temperature → Target Rolling Temperature → Required Heat Input → Production Capacity → Effective Heating Length & Conveying Speed → Online Temperature Measurement → Rolling Mill Coordination
Therefore, an induction billet heating system should not be selected simply by matching a billet size to a standard power rating.
For a customized project, the more important task is to coordinate induction heating, online temperature monitoring, roller conveying and rolling mill production takt as one complete system.
Usually not. Inlet temperature, target temperature, material grade, production capacity, conveying speed and rolling mill takt should also be considered when determining the complete configuration.
Because temperature compensation is based on the amount of heat required to bring the billet from its actual inlet condition to the required rolling condition. Different inlet temperatures therefore require different heat input.
No. Temperature compensation normally applies to billets that still retain residual heat but require additional heating before rolling. Heating a cold billet from a much lower initial temperature requires significantly different heat input and may require a different system configuration.
Because the billet heating system must support continuous rolling. If the heating and discharge rhythm cannot match the rolling mill, successfully heating an individual billet does not necessarily mean the complete production line can achieve the required continuous output.
Billet cross-sectional size is only one of the basic parameters required to design a temperature compensation line.
For billet reheating before rolling, continuous casting billet temperature compensation or direct rolling projects, it is recommended to provide:
billet cross section, length, material grade, inlet temperature, target rolling temperature, hourly production capacity and rolling mill takt.
Based on these operating conditions, engineers can further evaluate the required induction heating capacity, effective heating length, roller conveyor speed, online temperature monitoring and automatic line coordination.
The final objective is not simply to heat the billet, but to make the billet heating system and rolling process operate as a coordinated continuous production line.
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