Multi-Hole Aluminum Pipe Composition for Strength and Extrudability
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Solution Overview
Problem
Existing extruded multi-hole pipes face a challenge in achieving high strength while maintaining extrudability, as increasing alloying elements to enhance strength often leads to increased deformation resistance, making it difficult to manufacture complex cross-sectional shapes.
Innovation Solution
An extruded multi-hole pipe with a chemical composition of Si: 0.30-1.80%, Cu: 0.10-0.50%, Mn: 0.30-1.00%, and Mg: 0.30-1.00%, along with a manufacturing process involving homogenizing, hot extrusion, controlled cooling, and artificial-aging, to achieve a tensile strength of 290 MPa or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the content of alloying elements is increased to enhance strength, then the tensile strength is improved, but the deformation resistance increases and extrudability deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chemical composition parameters within specific ranges (Si: 0.01-0.3%, Fe: 0.01-0.3%, Cu: 0.05-0.4%, Mn: 0.05-0.3%, Zr: 0.05-0.25%, Ti: 0-0.15%) rather than simply increasing alloying element content. This optimized parameter combination achieves high tensile strength (290 MPa or more) while maintaining low deformation resistance and good extrudability for complex cross-sectional shapes.
Solution Approach 2:
The patent creates a composite material system by combining multiple alloying elements (Si, Fe, Cu, Mn, Zr, Ti) in specific proportions to form an aluminum alloy with optimized properties. The synergistic effect of these elements produces both high strength and good extrudability, resolving the contradiction between strength enhancement and manufacturing ease.
2Strength
If aluminum alloy with high strength is used, then the tensile strength is improved, but the deformation resistance during hot extrusion increases
Solution Approach 1:
The patent changes the material parameters by selecting a specific aluminum alloy composition with controlled alloying element contents. This optimized composition achieves tensile strength of 290 MPa or more while keeping deformation resistance low during hot extrusion, allowing complex cross-sectional shapes to be manufactured successfully.
Solution Approach 2:
The patent applies local quality by distributing alloying elements uniformly throughout the aluminum matrix at controlled concentrations. This creates localized strengthening effects through precipitation hardening while maintaining overall ductility and low deformation resistance during the extrusion process.
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 proposed solution effectively increases the strength of the extruded multi-hole pipe beyond conventional levels while reducing deformation resistance, enabling the production of complex cross-sectional shapes with improved extrudability.
Implementation Method 1
a homogenizing process is performed by holding the ingot at a temperature of 450° C. or higher and 620° C. or lower for 2 h or more
Implementation Method 2
the extruded, multi-hole pipe is cooled such that the average cooling rate becomes 1° C./s or more until the temperature of the extruded, multi-hole pipe reaches 150° C.
Implementation Method 3
an artificial-aging process is performed by holding the extruded, multi-hole pipe after the cooling at a temperature of 150° C. or higher and 200° C. or lower for 2 h or more
Data Source
AI summary
An extruded, multi-hole pipe (1) has an aluminum alloy composition that contains Si: 0.30 mass % or more and 1.80 mass % or less, Cu: 0.10 mass % or more and 0.50 mass % or less, Mn: 0.30 mass % or more and 1.00 mass % or less, and Mg: 0.30 mass % or more and 1.00 mass % or less. The tensile strength of the extruded, multi-hole pipe (1) is 290 MPa or more.