7004 aluminum alloy

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Product information

Model: 7004
Availability: Customizable 
7004 aluminum alloy is a high-strength deformation aluminum alloy. Its key performance characteristics are as follows:
Mechanical properties
‌Tensile strength: ≥ 370 MPa (T6 heat treatment state) ‌
‌Yield strength: ≥ 300 MPa (T6 heat treatment state) ‌
‌Elongation: ≥ 12% (T6 heat treatment state) ‌
‌Fatigue strength: 10⁷ cycle fatigue strength ≥ 160 MPa (R = -1) ‌
Corrosion resistance
‌Intergranular corrosion: 72-hour corrosion depth of EXCO test ≤ 80 μm ‌
‌Stress corrosion: No cracks in U-shaped specimens in 3.5% NaCl for 3000 hours ‌
Processing properties
‌Welding properties: Welding coefficient ≥ 0.90, MIG welded joint strength ≥ 90% of base metal ‌
‌Cutting parameters: VC = 200 - 260 m/min, feed rate 0.15 - 0.20 mm/r (surface roughness Ra ≤ 0.8 μm) ‌
‌Cold forming properties: Minimum bending radius of 1.5T when preheated to 120℃ ‌
Other characteristics
‌Density: 2.78 g/cm³ ‌
‌Heat conductivity: 155 W/(m·K) ‌
‌Linear expansion coefficient: 23.5 × 10⁻⁶/℃ (20 - 100℃) ‌
This alloy is designed by optimizing the distribution of η'(MgZn₂) phase and low Cu content, taking into account high strength, corrosion resistance and welding properties, and is suitable for large welding components such as rail vehicle bodies, container structures and construction machinery frames. 
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Chemical composition 
The chemical composition of 7004 aluminum alloy (according to the GB/T 3190-2020 standard) is as follows:
‌Aluminum (Al): 99% or more by weight
‌Zinc (Zn): 3.0% - 4.0%
‌Magnesium (Mg): 1.0% - 2.0%
‌Manganese (Mn): 0.20% - 0.70%
‌Iron (Fe): ≤ 0.25%
‌Silicon (Si): ≤ 0.20%
‌Copper (Cu): ≤ 0.10%
‌Titanium (Ti): ≤ 0.03%
‌Chromium (Cr): ≤ 0.05%
This alloy achieves a tensile strength of ≥ 370 MPa, a yield strength of ≥ 300 MPa, and an elongation of ≥ 12% under T6 heat treatment, while also having excellent welding properties (welding coefficient ≥ 0.90) and resistance to stress corrosion. 

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