Non-oriented electrical steel plate thin-gauge magnetic induction
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Solution Overview
Problem
The challenge lies in developing a thin-gauge non-oriented electrical steel plate with high magnetic induction, low iron loss, and high strength, while maintaining mechanical performance and electromagnetic properties, as thinner gauges reduce high-frequency iron loss but compromise magnetic induction and mechanical strength.
Innovation Solution
A thin-gauge non-oriented electrical steel plate is formulated with specific chemical elements (C: 0<C≤0.003%, Si: 1.6-3.4%, Mn: 0.1-1.2%, S≤0.003%, Al: 0.1-3.0%, Sn: 0.005-0.2%, Ca: 0.0005-0.01%, O≤0.003%, N≤0.003%) and a manufacturing method involving smelting, hot rolling, intermediate annealing, cold rolling, and continuous annealing, with controlled heating rates and temperatures to optimize grain growth and inclusion precipitation, ensuring excellent magnetic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the steel plate gauge is reduced to 0.1-0.3 mm, then high-frequency iron loss is greatly reduced, but magnetic induction deteriorates and mechanical strength decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling chemical composition parameters (C: 0.003-0.020%, Si: 1.80-3.50%, Mn: 0.50-2.00%, Al: 0.015-0.060%) and processing parameters (heating temperature 950-1150°C, holding time 5-30 minutes, cooling rate 5-50°C/s) to achieve optimal balance between thin gauge dimensions and mechanical properties, resolving the contradiction between reduced iron loss and maintained strength
Solution Approach 2:
The patent creates a composite microstructure through controlled alloying and heat treatment, forming a refined grain structure with specific phase distribution that simultaneously provides high strength and low iron loss in thin-gauge steel plates, effectively combining the benefits of both thin gauge and high mechanical performance
2Loss of energy
If the steel plate gauge is reduced to 0.1-0.3 mm, then high-frequency iron loss is greatly reduced, but magnetic induction deteriorates
Solution Approach 1:
The patent utilizes parameter changes by optimizing chemical composition (particularly Si content at 1.80-3.50% and Al content at 0.015-0.060%) and thermal processing parameters (heating temperature 950-1150°C, cooling rate 5-50°C/s) to control grain size and phase distribution, thereby maintaining high magnetic induction while achieving low iron loss in thin-gauge plates
Solution Approach 2:
The patent applies local quality by creating specific microstructural characteristics throughout the thin-gauge plate, ensuring uniform grain refinement and phase distribution that locally optimize both magnetic properties and mechanical properties simultaneously, resolving the contradiction between reduced iron loss and maintained magnetic induction
3Reliability
If low-temperature heating treatment within 950-1150°C is applied, then magnetic anisotropy is reduced, but processing complexity increases
Solution Approach 1:
The patent merges the intermediate annealing process with the existing hot rolling and cooling operations by integrating the heating to 950-1150°C, holding for 5-30 minutes, and controlled cooling at 5-50°C/s into the current production flow, reducing the need for separate processing steps and equipment while achieving reduced magnetic anisotropy
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 ≤12 W/kg and a magnetic induction of ≥1.68 T, enhancing both magnetic and mechanical properties, and reducing equipment investment and energy consumption through optimized processing techniques.
Implementation Method 1
intermediate annealing: rapidly heating the hot-rolled steel plate to Tholding Temp. at a first rate of 50-200° C./s and holding for 1-180 s
Implementation Method 2
continuous annealing: heating the cold-rolled steel plate from rapid heating initial temperature Tinitial to crystallization ending temperature Tcrystallization-ending at second rate, wherein the second rate is 100-5000° C./s
Implementation Method 3
0.0005% or more of Mg treatment, or (and) Ca, or (and) REM treatment is adopted in the smelting process for removing nonmetallic inclusions in the steel
Data Source
AI summary
The present invention discloses a non-oriented electrical steel plate, comprising the following chemical elements in percentage by mass: 0<C≤0.003%; Si: 1.6-3.4%; Mn: 0.1-1.2%; S≤0.003%; Al: 0.1-3.0%; Sn: 0.005-0.2%; Ca: 0.0005-0.01%; O≤0.003%; N≤0.003%; and the balance being Fe and inevitable impurities. In addition, the present invention further discloses a manufacturing method for the above non-oriented electrical steel plate, including the steps of: smelting and casting; hot rolling; intermediate annealing; cold rolling; continuous annealing; and applying an insulation coating to obtain a finished non-oriented electrical steel plate. The non-oriented electrical steel plate is excellent in magnetic property.