Ferritic Stainless Steel Surface Texture for Whiteness and Image Clarity
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Solution Overview
Problem
Existing ferritic stainless steel sheets fail to achieve both high whiteness and high image clarity, which are essential for a calm and luxurious appearance.
Innovation Solution
The development of a ferritic stainless steel sheet with a surface texture comprising plateau portions and valley portions, where the area ratio of plateau portions is 30% to 70%, and the surface roughness resistance is enhanced by controlling the autocorrelation length and texture aspect ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the steel sheet surface is made uniformly smooth to achieve high image clarity, then image clarity is improved, but whiteness decreases due to excessive light reflection concentration
Solution Approach 1:
The steel sheet surface is divided into two types of regions with different properties: plateau portions (smooth regions occupying 30-70% of the surface area) and valley portions (rough regions occupying 30-70% of the surface area). This local differentiation allows the plateau portions to provide high image clarity through smooth light reflection, while the valley portions provide high whiteness through diffuse light scattering. The coexistence of these two distinct surface regions resolves the contradiction between image clarity and whiteness.
2Illumination intensity
If the steel sheet surface is made uniformly rough to achieve high whiteness, then whiteness is improved, but image clarity decreases due to light scattering
Solution Approach 1:
The steel sheet surface is divided into two types of regions with different properties: plateau portions (smooth regions occupying 30-70% of the surface area) and valley portions (rough regions occupying 30-70% of the surface area). This local differentiation allows the plateau portions to provide high image clarity through smooth light reflection, while the valley portions provide high whiteness through diffuse light scattering. The coexistence of these two distinct surface regions resolves the contradiction between image clarity and whiteness.
3Measurement precision
If the entire surface is made smooth to achieve high image clarity, then image clarity is improved, but surface roughness resistance decreases
Solution Approach 1:
The steel sheet surface is divided into two types of regions with different properties: plateau portions (smooth regions occupying 30-70% of the surface area) and valley portions (rough regions occupying 30-70% of the surface area). This local differentiation allows the plateau portions to provide high image clarity through smooth light reflection, while the valley portions provide high whiteness through diffuse light scattering. The coexistence of these two distinct surface regions resolves the contradiction between image clarity and whiteness.
4Object-affected harmful factors
If the entire surface is made rough to achieve high surface roughness resistance, then surface roughness resistance is improved, but image clarity decreases
Solution Approach 1:
The steel sheet surface is divided into two types of regions with different properties: plateau portions (smooth regions occupying 30-70% of the surface area) and valley portions (rough regions occupying 30-70% of the surface area). This local differentiation allows the plateau portions to provide high image clarity through smooth light reflection, while the valley portions provide high whiteness through diffuse light scattering. The coexistence of these two distinct surface regions resolves the contradiction between image clarity and whiteness.
Data Source
AI summary
Provided is a ferritic stainless steel sheet having both high whiteness and high image clarity. A surface of the ferritic stainless steel sheet is made up of plateau portions and valley portions, an area ratio of the plateau portions is 30% to 70%, Sdr of the plateau portions is 0.100 or less, Sdq of the valley portions is 0.20 or more, Sal is 50 μm or less, and Str is 0.30 or more.