Ferritic Stainless Steel Composition for Higher Magnetization
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Solution Overview
Problem
Ferritic stainless steels exhibit inferior magnetic properties, limiting their application in induction heating and electric motors, necessitating improved magnetization.
Innovation Solution
A ferritic stainless steel composition with controlled carbonitride formation, adjusted alloying elements, and specific manufacturing processes to enhance the {001} crystal texture, achieving a B50 value of 0.5 T or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ferritic stainless steel is used for induction heating applications, then corrosion resistance is improved, but magnetic properties deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of ferritic stainless steel by strictly limiting carbon (0.01% or less) and nitrogen (0.003% or less) content, and controlling the ratio of carbonitride-forming elements to manganese according to Equation (1). This parameter optimization suppresses carbonitride formation and promotes {001} crystal texture development, achieving B50 values of 0.5 T or more while maintaining corrosion resistance
Solution Approach 2:
The patent creates a composite microstructure by controlling the distribution of carbonitrides at density of 100 pieces/mm² or less and developing strong {001} crystal texture with strength of 10.0 or more. This composite approach combines the corrosion resistance of ferritic stainless steel with improved magnetic properties through textured microstructure
2Use of energy by moving object
If carbon and nitrogen content is reduced to suppress carbonitride formation, then magnetic properties are improved, but manufacturing precision becomes more difficult to control
Solution Approach 1:
The patent applies preliminary action by establishing strict compositional limits for carbon (0.01% or less) and nitrogen (0.003% or less) from the outset, and pre-calculating the carbonitride formation tendency using Equation (1) before manufacturing. This preliminary control of composition prevents excessive carbonitride formation and ensures development of desired {001} crystal texture, achieving B50 ≥ 0.5 T while maintaining manufacturing control
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 improved magnetization enables efficient induction heating and energy-efficient applications in induction cookers and electric motors.
Implementation Method 1
Induction ranges generate heat by magnetic induction
Implementation Method 2
Induction ranges use resistance heat of eddy current generated by a magnetic field
Implementation Method 3
hot-rolled annealing the hot-rolled steel sheet
Data Source
AI summary
Disclosed is a ferritic stainless steel having improved magnetization including, in percent by weight (wt %), 0.01% or less (excluding 0) of C, 0.003% or less (excluding 0) of N, 15 to 18% of Cr, 0.3 to 1.0% of Mn, 0.2 to 0.3% of Si, 0.005% or less (excluding 0) of Al, 0.005% or less (excluding 0) of Ti, and the balance of Fe and inevitable impurities, and satisfying the following equation,(Ti+Al+8*(C+N)/Mn)≤0.3 Equation (1):(wherein Ti, Al, C, N, and Mn denote amounts (wt %) of the respective elements).