Grain-Oriented Steel Rolling Temperature Control for Texture Stability
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Solution Overview
Problem
Existing methods for producing grain-oriented electrical steel sheets with inhibitorless secondary recrystallization face challenges in maintaining stable magnetic properties due to variations in rolling rate, particularly when using a tandem mill, leading to inconsistent texture and iron loss properties.
Innovation Solution
The method involves controlling the steel sheet temperature by adjusting the heating device in conjunction with the rolling rate during cold rolling, ensuring that the temperature difference between steady and deceleration parts satisfies a specific formula (T1≥T0+10°C) to stabilize secondary recrystallization behavior and suppress texture variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rolling rate is decreased to connect coils by welding, then the operation is easier, but the steel sheet temperature becomes lower and texture uniformity deteriorates
Solution Approach 1:
The patent applies preliminary heating before the rolling process to ensure that even when rolling rate is decreased for coil connection, the steel sheet temperature remains within the required range (T1≥T0+10°C). This preliminary thermal preparation prevents texture variation caused by low-temperature rolling during welding operations.
Solution Approach 2:
The patent dynamically adjusts the steel sheet temperature parameter during rolling by controlling the heating device output based on rolling rate variations. When rolling rate decreases, the heating device increases temperature compensation to maintain T1≥T0+10°C, thereby resolving the contradiction between operational ease and texture stability.
2Adaptability or versatility
If the rolling rate varies during cold rolling, then the production flexibility is improved, but the magnetic properties become unstable
Solution Approach 1:
The patent implements a feedback control system where the heating device output is adjusted based on rolling rate measurements. The control unit monitors rolling rate and dynamically modifies heating parameters to maintain steel sheet temperature within the required range, ensuring stable magnetic properties despite rolling rate variations for production flexibility.
Solution Approach 2:
The patent changes the temperature parameter dynamically in response to rolling rate changes. By maintaining T1≥T0+10°C through adaptive heating control, the system allows rolling rate flexibility while preserving magnetic property stability through real-time parameter adjustment.
3Device complexity
If the steel sheet temperature is not controlled during variable rolling rate, then the process complexity is reduced, but the texture variation increases
Solution Approach 1:
The patent employs feedback control where temperature measurements guide heating device adjustments. The control unit receives temperature feedback and modifies heating output to maintain T1≥T0+10°C during variable rolling rate operations, achieving texture consistency through intelligent temperature management.
Solution Approach 2:
The patent replaces simple mechanical temperature control with an intelligent control system that uses sensors and algorithms to dynamically adjust heating based on rolling rate and temperature measurements. This substitution of mechanical control with intelligent control achieves texture stability while adapting to production requirements.
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 ensures consistent magnetic properties within the same coil, achieving stable iron loss performance by minimizing texture inconsistencies and enhancing the uniformity of the grain-oriented electrical steel sheet.
Implementation Method 1
controlling the steel sheet temperature by adjusting the heating device in conjunction with the rolling rate during cold rolling
Implementation Method 2
the temperature of a steel sheet during rolling increases due to processing heat generated by the rolling
Implementation Method 3
simultaneously heat releasing by the rolls in contact with the steel sheet occurs
Data Source
AI summary
Provided is a production method for a grain-oriented electrical steel sheet with which stable magnetic properties are obtained in the same coil. The method comprises: hot rolling a steel slab having a predetermined chemical composition, followed by annealing to obtain a hot-rolled and annealed sheet; cold rolling the hot-rolled and annealed sheet one time, or two times or more with intermediate annealing being performed therebetween, to obtain a cold-rolled sheet, followed by subjecting to primary and secondary recrystallization annealing, wherein in the cold rolling, a rolling reduction ratio is 80% or more at least one time out of the one time or two times or more, and a steel sheet temperature T0 (° C.) while a rolling rate is a set value R0 (mpm) and a steel sheet temperature T1 (° C.) while the rolling rate is less than or equal to 0.5×R0 (mpm) satisfy a formula (1).