Cu-Containing Electrical Steel Sheet for Low Iron Loss Annealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing non-oriented electrical steel sheets face challenges in achieving low iron loss and high magnetic induction while maintaining cost-effectiveness and manufacturing efficiency, as high silicon and aluminum content leads to reduced magnetic induction and increased manufacturing costs, and traditional processes like normalizing and bell-type furnace annealing prolong production cycles and increase costs.
Innovation Solution
A Cu-containing non-oriented electrical steel sheet with controlled chemical compositions (0<C≤0.003%, Si: 0.1-2.0%, Mn: 0.1-0.55%, S: 0-0.004%, Cu: 0.003-0.2%, Al: 0.1-1.0%) and a continuous annealing process involving rapid heating rates (50-800°C/s) and controlled heating rates (≤30°C/s) to optimize grain growth and reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contents of silicon and aluminum in steel are significantly increased to reduce iron loss and improve magnetic induction, then electromagnetic performance is improved, but magnetic induction decreases rapidly and manufacturing cost increases
Solution Approach 1:
The patent changes the chemical composition parameters by adding copper (0.03-0.20%) while controlling silicon (0.10-2.00%) and aluminum (0.10-1.00%) content to specific ranges. This parameter optimization allows achieving low iron loss (≤4.1W/kg) and high magnetic induction (≥1.72T) without the rapid degradation seen in conventional high-silicon steels
Solution Approach 2:
The patent creates a composite alloy system combining silicon, aluminum, and copper in specific proportions. The copper acts as a grain boundary segregator that works synergistically with silicon and aluminum to improve electromagnetic performance while maintaining magnetic induction, effectively creating a multi-element composite material system
2Reliability
If traditional normalizing and bell-type furnace intermediate annealing processes are used to improve iron loss and magnetic induction, then electromagnetic performance is improved, but production cycle is prolonged and manufacturing cost increases
Solution Approach 1:
The patent performs preliminary action by adding copper during the initial steelmaking stage, which enables grain boundary segregation to occur during subsequent rolling and annealing processes. This preliminary copper addition prepares the material structure in advance, allowing the final annealing to achieve superior electromagnetic performance without requiring extended normalizing or intermediate annealing treatments
Solution Approach 2:
The patent extracts or eliminates the need for separate normalizing and bell-type furnace intermediate annealing processes by incorporating copper into the base steel composition. The copper-driven grain boundary segregation during rolling and final annealing replaces the function of these traditional multi-step heat treatments, simplifying the production process and reducing cycle time
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
The solution achieves iron loss of ≤4.1 W/kg and magnetic induction of ≥1.72 T, with improved production efficiency and reduced energy consumption, while maintaining high cleanliness and magnetic performance.
Implementation Method 1
0.20-0.45% of (Sn+Cu) is added into the steel, so as to improve texture formation of the materials by grain boundary segregation
Implementation Method 2
a continuous annealing process involving rapid heating rates (50-800°C/s) and controlled heating rates (≤30°C/s) to optimize grain growth
Data Source
AI summary
The present invention discloses a Cu-containing non-oriented electrical steel plate having high cleanliness, comprising the following chemical elements in percentage by mass: 0<C≤0.003%; Si: 0.1-2.0%; Mn: 0.1-0.55%; S: 0-0.004%; Cu: 0.003-0.2%; Al: 0.1-1.0%; and the balance being Fe and inevitable impurities. In addition, the present invention further discloses a continuous annealing process for the Cu-containing non-oriented electrical steel plate having high cleanliness. Moreover, the present invention further discloses a manufacturing method for Cu-containing non-oriented electrical steel plate having high cleanliness, including the steps of: smelting and casting; hot rolling; normalizing; cold rolling; performing the continuous annealing process; and applying an insulation coating to obtain a finished non-oriented electrical steel plate. The Cu-containing non-oriented electrical steel plate having high-cleanliness is high in cleanliness and excellent in magnetic performance.