Oriented Silicon Steel Grain Control
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Solution Overview
Problem
Current methods for producing oriented silicon steel with excellent magnetic properties under working magnetic flux densities of 1.5-1.7T are inadequate, and conventional manufacturing methods are inefficient, leading to high energy consumption and environmental concerns.
Innovation Solution
Control the area ratio of small crystal grains with a grain size less than 5mm to not more than 3% and optimize the cold rolling process to achieve a magnetic conductivity ratio of 0.50 or more under specific magnetic inductions, using a slab with suitable components and reducing the heating temperature to improve magnetic properties and reduce production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the number of small crystal grains is increased to reduce iron loss, then iron loss decreases, but magnetic properties may be degraded due to large-angle deviation from Goss texture
Solution Approach 1:
The patent applies parameter changes by precisely controlling the area ratio of small crystal grains (D<5mm) to be 5-30%, rather than simply increasing their number. This quantitative parameter control ensures that small grains contribute to reducing iron loss while maintaining sufficient Goss texture orientation to preserve magnetic properties.
Solution Approach 2:
The patent applies local quality by differentiating the treatment and evaluation of small grains versus large grains. Small grains (D<5mm) are controlled within a specific area ratio range to provide local refinement that reduces iron loss, while large grains (D≥5mm) maintain the dominant Goss texture for overall magnetic performance. This localized control of grain characteristics resolves the contradiction between iron loss reduction and magnetic property preservation.
2Reliability
If heating temperature is increased to improve magnetic properties, then magnetic conductivity improves, but energy consumption increases and environmental impact worsens
Solution Approach 1:
The patent applies parameter changes by optimizing the heating temperature to a specific range (1000-1200°C) rather than using excessively high temperatures. This parameter optimization achieves the necessary magnetic conductivity improvement while avoiding unnecessary energy consumption and environmental harm associated with higher heating temperatures.
3Reliability
If cold rolling reduction ratio is increased to improve grain orientation, then magnetic properties improve, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by setting the cold rolling reduction ratio within a specific range (80-95%) rather than simply maximizing it. This parameter control achieves sufficient grain orientation and Goss texture development while avoiding excessive manufacturing complexity that would result from extremely high reduction ratios requiring multiple passes or specialized equipment.
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
Stably produces oriented silicon steel with excellent magnetic properties and low iron loss, while reducing energy consumption and environmental impact by controlling grain size and composition, and optimizing the manufacturing process.
Implementation Method 1
heating a slab of the oriented silicon steel to 1100-1200°C and then performing hot rolling to obtain a hot rolled plate
Implementation Method 2
performing an annealing treatment on the cold rolled plate to obtain the oriented silicon steel finished product
Data Source
AI summary
The invention discloses an oriented silicon steel with excellent magnetic properties and a manufacturing method thereof. The present invention obtains the oriented silicon steel with excellent magnetic properties by controlling the area ratio of small crystal grains of D<5mm in an oriented silicon steel finished product to be not more than 3%, and controlling the ratio µ17/µ15 of the magnetic conductivity under the magnetic induction of 1.7T to the magnetic conductivity under the magnetic induction of 1.5T in the oriented silicon steel finished product to be 0.50 or more. In addition, by using a slab of the oriented silicon steel with suitable components and an optimized cold rolling step, the present invention effectively decreases the heating temperature of the slab and the production cost thereof, and simultaneously better controls the size and ratio of the crystal grains in the oriented silicon steel finished product and the magnetic conductivity in a certain range of magnetic induction, ensures that secondary recrystallization has good Goss texture orientation and finally, stably obtains the oriented silicon steel product with excellent magnetic properties.