7A04 Aluminum Bar is a high-strength aerospace-grade aluminum alloy in the Al-Zn-Mg-Cu system, renowned for its excellent mechanical properties and wide industrial applications. This alloy is widely manufactured and used globally due to its balanced performance, making it a preferred choice for demanding structural components. The key features of 7A04 aluminum bar include high strength, good fatigue resistance, moderate corrosion resistance (enhanced with surface treatments), and excellent performance under stress at room and sub-zero temperatures. The alloy demonstrates remarkable workability in annealed and solution-treated conditions, though heat treatment must be strictly controlled to achieve optimal mechanical properties. Welding requires specialized techniques due to susceptibility to cracking, but riveting and bolting are straightforward with proper handling.

Applications: 7A04 aluminum bars are extensively used in aerospace and aviation structures, including aircraft frames, ribs, fuselage skins, missile components, and high-load mechanical parts. They are also suitable for automotive structural components, high-performance machinery, and sports equipment requiring lightweight, high-strength materials.

Chemical Composition of 7A04 Aluminum Bar:

• Silicon (Si): ≤ 0.5%

• Iron (Fe): ≤ 0.5%

• Copper (Cu): 3.8–4.9%

• Manganese (Mn): 0.3–0.9%

• Magnesium (Mg): 1.2–1.8%

• Chromium (Cr): 0.18–0.25%

• Zinc (Zn): 4.2–5.2%

• Titanium (Ti): 0.15%

• Others: ≤ 0.15%

• Aluminum (Al): Balance

Properties and Advantages:

• High Strength: 7A04 aluminum bar offers outstanding tensile and yield strength, comparable to steel, while maintaining a low density of approximately 2.78 g/cm³.

• Heat Resistance: Suitable for structural components operating below 150°C, with strength retention at elevated temperatures.

• Excellent Fatigue Resistance: Ideal for aerospace and mechanical parts subject to cyclic loading.

• Corrosion Resistance: Moderate in natural condition, but significantly improved with anodizing, aluminum plating, or other protective coatings.

• Workability: Good machinability and formability under solution treatment, aging, and annealing conditions. Can be extruded, forged, or cold-worked to desired shapes.

• Cryogenic Performance: Maintains toughness at extremely low temperatures, suitable for applications involving liquid oxygen, hydrogen, and other cryogenic liquids.

• Electrical and Thermal Conductivity: Offers efficient heat dissipation and can be used for components requiring lightweight thermal conductivity.

Physical Characteristics of Aluminum:
Aluminum is a lightweight, silver-white metal with excellent reflectivity, corrosion resistance, and thermal and electrical conductivity. The combination of aluminum with zinc, magnesium, and copper in 7A04 alloy provides superior mechanical properties compared to pure aluminum while retaining lightweight advantages. This makes 7A04 aluminum bars ideal for aerospace, automotive, marine, and high-tech industrial applications where strength, reliability, and weight reduction are critical.

Aluminum Production Process