Induction Heating for Continuous Thin Strip Casting
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Solution Overview
Problem
In continuous thin strip casting, high-temperature molten steel tends to solidify during pouring, leading to quality defects and energy inefficiencies due to temperature fluctuations and inclusion issues.
Innovation Solution
A method and device for maintaining constant-temperature pouring through external heating of the tundish and nozzle using induction heating, ensuring molten steel flows smoothly into the casting process without premature solidification, with adjustable power settings to maintain optimal superheat levels throughout the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If molten steel is poured through long nozzle and tundish without external heating, then the pouring process is simple, but the molten steel temperature decreases significantly and may solidify
Solution Approach 1:
The induction heating device heats the molten steel in advance within the tundish before it reaches the casting zone. This preliminary heating action compensates for temperature loss during transport through the long nozzle and tundish, preventing solidification without requiring complex post-heating systems.
Solution Approach 2:
The induction heating device acts as an intermediary between the molten steel and the casting process. It transfers electromagnetic energy to the molten steel to maintain temperature, serving as a thermal mediator that enables continuous pouring without direct contact heating mechanisms.
2Reliability
If high superheat degree is maintained in ladle, then molten steel remains liquid longer, but energy consumption increases and refractory material wastage increases
Solution Approach 1:
Instead of uniformly heating the entire ladle contents to high superheat, the induction heating device applies localized heating only to the molten steel in the tundish area. This local quality approach maintains liquidity where needed while minimizing overall energy consumption and refractory material exposure to extreme temperatures.
Solution Approach 2:
The system dynamically adjusts the heating parameters of the induction device based on real-time temperature monitoring. By changing the heating power parameter adaptively, the system maintains the minimum necessary superheat degree for liquidity while avoiding excessive energy consumption and refractory wastage associated with uniformly high temperatures.
3Productivity
If pouring speed is increased to improve productivity, then production efficiency improves, but temperature loss increases and solidification risk increases
Solution Approach 1:
The induction heating device operates continuously throughout the pouring process, providing uninterrupted thermal energy to the molten steel. This continuous heating action compensates for temperature losses that occur at higher pouring speeds, enabling increased productivity without sacrificing temperature stability or increasing solidification risk.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach stabilizes the pouring process, reduces energy consumption, minimizes refractory material wastage, and enhances cast strip quality by preventing solidification and facilitating inclusion floatation, thus improving the overall efficiency and consistency of continuous thin strip casting.
Implementation Method 1
heating the molten steel in a manner of externally heating the tundish... the molten steel after induction heating
Implementation Method 2
a temperature of the molten steel after induction heating is 30～50℃ higher than that at the time of it is introduced into the tundish
Data Source
AI summary
A method for continuous thin strip casting comprises: introducing molten steel through a long nozzle into a tundish from a ladle, the tundish is one strand tundish, and the molten steel flows below a weir, then passes a first dam and enters a channel with an induction heating device, and the heated molten steel then flows out from an outlet at the other side of the tundish to a nozzle also with an induction heating device for casting. The distances between the weirs of the tundish and the channel have optimal distance ranges. The present invention can improve the casting stability and the quality of the casting strip.