Rolled Aluminium Alloy Sheet Composition for Outdoor Formability
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Solution Overview
Problem
Existing aluminium alloy sheet products for the building industry lack a balance of strength, corrosion resistance, and formability, particularly for outdoor applications.
Innovation Solution
A rolled Al-Si-Mg-Mn alloy sheet with specific composition (Si1.10 - 1.6, Mg0.25 - 0.40, Mn0.6 - 1.6, Cu0.10 - 0.6, Fe0.05 - 0.7, Ti0.05 - 0.20, Zn up to 0.4, balance aluminium) that offers improved strength, corrosion resistance, and good formability, incorporating Si-containing brazing scrap and a textured surface for enhanced appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If existing aluminium alloy compositions are used for building industry applications, then manufacturing is straightforward, but the balance of strength, corrosion resistance and formability is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chemical composition parameters of the aluminium alloy. Specifically, it limits Si to 0.6-1.6%, Cu to 0.10-0.50%, Mn to 0.6-1.2%, and Mg to 0.10-0.50%, while controlling impurities. This systematic parameter optimization resolves the contradiction by achieving the required strength level while maintaining adequate corrosion resistance for building applications.
2Strength
If higher strength aluminium alloys are used, then structural performance improves, but formability and roll formability deteriorate
Solution Approach 1:
The patent resolves this contradiction through parameter changes in alloy composition. By carefully selecting and limiting the content of strengthening elements (Si: 0.6-1.6%, Cu: 0.10-0.50%, Mn: 0.6-1.2%, Mg: 0.10-0.50%) and controlling impurity levels (Fe, Zn, and others each max 0.05%, total max 0.15%), the alloy achieves sufficient strength while maintaining good formability and roll formability required for building industry fabrication.
3Ease of manufacture
If aluminium alloy contains higher levels of impurities, then manufacturing cost decreases, but corrosion resistance and material quality deteriorate
Solution Approach 1:
The patent applies parameter changes by establishing specific impurity limits that balance manufacturing feasibility with material quality. It specifies Fe up to 0.7%, Zn up to 0.20%, and other unavoidable impurities each maximum 0.05% with a total of 0.15%. These controlled parameter ranges allow cost-effective manufacturing while ensuring adequate corrosion resistance for outdoor building applications.
Data Source
AI summary
The invention relates to a rolled aluminium alloy sheet product for outdoor use in the building industry, wherein the aluminium alloy has the following composition, in wt.%: Si 0.6 to 1.6, Mg 0.10 to 0.50, Mn 0.6 to 1.6, Cu 0.10 to 0.6, Fe 0.05 to 0.7, Ti 0.05 to 0.20, Zn up to 0.4, others and unavoidable impurities, each 0.05% max, total 0.25%, balance aluminium. Furthermore, the invention relates to the use of the sheet product for outdoor use in the building industry.