Non-Oriented Electrical Steel Sheet With Controlled Texture Balance
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Solution Overview
Problem
Non-oriented electrical steel sheets face challenges in achieving low iron loss and high magnetic flux density due to increased Si and Al content, which leads to decreased magnetic flux density, torque reduction, and brittleness, as well as degraded magnetic characteristics from excessive texture development during cold rolling.
Innovation Solution
A non-oriented electrical steel sheet with controlled Si, Al, and Mn content ratios, combined with a final annealing heat treatment in an inert gas atmosphere, and a reduction ratio of 55% or less in cold rolling to suppress 111 surface texture and enhance 100 surface texture strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the content ratio of Si and Al is increased to reduce iron loss, then electrical resistance increases and iron loss decreases, but magnetic flux density decreases
Solution Approach 1:
The patent optimizes the content ratios of Si (1.0-3.5 wt%) and Al (0.2-0.6 wt%) to achieve the right balance between electrical resistance and magnetic flux density. This parameter optimization allows the material to simultaneously achieve low iron loss (2.3 W/kg or less) and high magnetic flux density (1.79 to 1.90 T) by finding the optimal compositional parameters.
2Loss of energy
If the content ratio of Si exceeds 3.5 wt% to reduce iron loss, then electrical resistance increases, but cracks occur during cold rolling due to increased brittleness
Solution Approach 1:
The patent sets the Si content ratio to 1.0-3.5 wt% (not exceeding 3.5 wt%) to maintain adequate electrical resistance for low iron loss while preventing excessive brittleness that would cause cracks during cold rolling. This parameter control ensures both low iron loss and manufacturing reliability.
3Shape
If the reduction ratio in cold rolling is increased to 60% or more to improve shape, then the texture of 111 surface is strongly developed, but the fraction of 100 surface texture decreases and magnetic characteristics are degraded
Solution Approach 1:
The patent controls the reduction ratio in cold rolling to be less than 60% to prevent excessive development of the 111 surface texture. By maintaining the reduction ratio below this threshold, the patent preserves a higher fraction of the 100 surface texture which has excellent magnetic characteristics, thereby maintaining superior magnetic performance.
4Shape
If the reduction ratio in cold rolling is increased to 60% or more to improve shape, then the texture of 111 surface is strongly developed, but iron loss increases due to degraded magnetic characteristics
Solution Approach 1:
The patent optimizes the reduction ratio to remain below 60% to prevent the development of unfavorable 111 surface texture. This parameter control ensures that the magnetic characteristics remain excellent, thereby achieving low iron loss (2.3 W/kg or less) while still obtaining adequate shape improvement from the cold rolling process.
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 an iron loss of 2.3 W/kg or less and a magnetic flux density of 1.79 to 1.90 T, suitable for high-efficiency applications in motors and transformers, while preventing brittleness and maintaining excellent magnetic characteristics.
Implementation Method 1
performing a final annealing heat treatment in an inert gas atmosphere
Data Source
AI summary
Disclosed are a non-oriented electrical steel sheet and a manufacturing method therefore, the sheet ensuring excellent magnetic characteristics by having increased texture intensity of surface (100) through strict control of the content ratio of Si, Al and the like and through final annealing heat treatment in an inert gas atmosphere.