Copper Alloy Tube Composition for Thin-Wall Burst Pressure
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Solution Overview
Problem
Existing high-strength copper tubes face challenges in achieving a balance between strength and formability, with issues such as low burst pressure, poor corrosion resistance, and high susceptibility to intergranular corrosion, particularly in thin-walled applications.
Innovation Solution
A copper alloy composition with controlled additions of Sn, Ni, and P, combined with a recrystallization process, to create a high proportion of low-Σ value coincidence site lattice grain boundaries, enhancing tensile strength while maintaining low yield-to-tensile ratio and improving corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-strength copper tubes are developed by adding high contents of Sn, Zn and Ni, then burst pressure is improved, but formability deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the alloying element contents within specific ranges (Sn: 0.01-0.10%, Zn: 0.01-0.05%, Ni: 0.01-0.03%) rather than using high contents. This controlled parameter approach achieves the necessary burst pressure improvement while avoiding the formability deterioration that occurs with high alloying content. The patent also controls the yield-to-tensile strength ratio within 0.25-0.35 to balance strength and formability.
Solution Approach 2:
The patent uses a composite material approach by combining multiple alloying elements (Sn, Zn, Ni, and P) in specific proportions to create a copper alloy that achieves both high burst pressure and good formability. The synergistic effect of these elements in controlled amounts provides both the strength enhancement from Sn and the formability maintenance from the balanced composition, avoiding the drawbacks of individual high-content additions.
2Ease of operation
If TP2 copper tube is used with traditional phosphorus deoxidation, then formability is excellent, but burst pressure is low
Solution Approach 1:
The patent modifies the composition parameters of traditional TP2 copper by adding controlled amounts of Sn (0.01-0.10%), Zn (0.01-0.05%), and Ni (0.01-0.03%) while maintaining phosphorus deoxidation. This parameter change approach enhances burst pressure without compromising the excellent formability inherited from the TP2 base composition, effectively resolving the strength-formability trade-off.
3Weight of moving object
If wall thickness is reduced to meet lightweight requirements, then mass is reduced, but burst pressure safety is compromised
Solution Approach 1:
The patent enables wall thickness reduction by changing the material composition parameters to achieve higher strength. The controlled addition of Sn, Zn, and Ni creates a copper alloy with enhanced mechanical properties, allowing thinner walls to maintain the required burst pressure safety while reducing overall mass for lightweight applications.
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 copper alloy achieves high tensile strength, low yield-to-tensile ratio, excellent formability, and enhanced corrosion resistance, with improved burst pressure and reduced corrosion rates in thin-walled conditions.
Implementation Method 1
combined with a recrystallization process, to create a high proportion of low-Σ value coincidence site lattice grain boundaries
Implementation Method 2
A copper alloy composition with controlled additions of Sn, Ni, and P
Data Source
AI summary
The present application discloses a high-performance copper alloy tube and a preparation method thereof. In the present application, a copper alloy tube with high strength, high processing and forming capability, excellent pressure resistance, corrosion resistance, and high-temperature softening resistance is prepared by adding Sn, Ni, and P elements to Cu, adjusting the content and proportion of each element, and introducing a high proportion of Σ3, Σ9, and Σ27 coincidence site lattice grain boundaries in combination with recrystallization treatment process. Meanwhile, elements Zr, Co, and B (optionally) are added on the basis of the above alloy components to further improve the performance of the copper alloy tube. The copper alloy tube of the present application meets the performance requirements of the high pressure-resistant and thin-walled seamless copper tube, and has broad application prospects in the field of heat exchange.