Tin-Containing Non-Grain-Oriented Silicon Steel for Shorter Processing
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Solution Overview
Problem
Current methods for producing non grain-oriented Fe-Si electrical steel sheets are energy-intensive and lengthy, compromising productivity while aiming to maintain optimal magnetic induction and power loss properties.
Innovation Solution
A simplified production method involving specific chemical compositions (2.0-5.0 wt% Si, 0.1-3.0 wt% Al, 0.1-1.0 wt% Mn, 0.04-0.2 wt% Sn, and controlled thermomechanical processing, including optional hot band annealing and cold rolling without intermediate annealing, to achieve balanced magnetic properties and reduced tool wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional production methods with multiple cold rolling and annealing steps are used, then magnetic properties (induction and power loss) are maintained, but productivity decreases and production route becomes lengthy
Solution Approach 1:
The invention extracts and eliminates the intermediate annealing step from the conventional production route, reducing the number of processing steps from multiple cold rolling and annealing cycles to a simplified sequence that achieves the same magnetic properties with higher productivity
Solution Approach 2:
The invention changes the chemical composition parameters by adding specific amounts of Sn (0.03-0.10%), Ti (0.01-0.05%), and Nb (0.01-0.05%) to the Fe-Si alloy, which modifies the material's microstructure and magnetic properties, allowing the simplified processing route to achieve the desired performance
2Reliability
If multiple cold rolling and annealing steps are implemented, then magnetic induction and power loss properties are optimized, but energy consumption increases
Solution Approach 1:
The invention removes the intermediate annealing step that consumes significant energy, replacing it with a simplified processing sequence that relies on the beneficial effects of Sn, Ti, and Nb additions to achieve the desired magnetic properties with reduced energy input
Solution Approach 2:
By modifying the chemical composition with specific alloying elements, the invention changes the material's inherent properties to reduce sensitivity to processing parameters, thereby reducing the energy required for thermomechanical processing while maintaining magnetic performance
3Productivity
If simplified production route is used, then productivity improves, but magnetic properties and power loss performance may deteriorate
Solution Approach 1:
The invention compensates for the simplified processing by precisely controlling chemical composition parameters, particularly the addition of Sn (0.03-0.10%), Ti (0.01-0.05%), and Nb (0.01-0.05%), which fundamentally alter the material's microstructure and magnetic properties to achieve desired performance with fewer processing steps
Solution Approach 2:
The invention creates a composite alloy system by combining Fe-Si with multiple alloying elements (Sn, Ti, Nb), where each element contributes specific properties that collectively enhance magnetic performance and enable the simplified production route to succeed
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 method achieves improved magnetic induction and reduced power losses with enhanced productivity and limited tool wear, suitable for high-efficiency motors and generators, including those for electric and hybrid vehicles.
Implementation Method 1
adding silicon to iron is a very common way to increase electrical resistivity, hence improving magnetic properties, and reducing at the same time the total power losses
Implementation Method 2
hot rolling, and then primary cold rolling with a rolling rate of 60-70% to produce a steel sheet with a middle thickness
Implementation Method 3
process annealing, and further final annealing at 950 °C or more for 20-90 seconds
Data Source
AI summary
The present invention is directed at a method of production non grain-oriented Fe-Si steel sheet. The method comprises the steps of melting a steel composition that contains in weight percentage: C ≤ 0.006, 2.0 ≤ Si ≤ 5.0, 0.1 ≤ Al ≤ 3.0, 0.1 ≤ Mn ≤ 3.0, N ≤ 0.006, 0.04 ≤ Sn ≤ 0.2, S ≤ 0.005, P ≤ 0.2, Ti ≤ 0.01, the balance being Fe and other inevitable impurities, casting said melt into a slab, reheating said slab, hot rolling said slab, coiling said hot rolled steel, optionally annealing the hot rolled steel, cold rolling, annealing and cooling the cold rolled steel down to room temperature.