7075 Large Diameter Aluminum Bar

1. Chemical Composition of 7075 Large Diameter Aluminum Bar

The 7075 aluminum alloy is an Al-Zn-Mg-Cu system heat-treated strengthened alloy, known for its high specific strength. It is one of the most widely used high-strength aluminum alloys in industrial fields. The chemical composition is as follows:

2. Mechanical Properties of 7075-T6 / T651 Aluminum Bar

The 7075 aluminum alloy bar exhibits extremely high strength after heat treatment, making it particularly suitable for high-strength load-bearing components. The 7075-T6 is the standard strengthening state, while the T651 state undergoes stress relief on top of the T6 state, making it ideal for precise machining of large diameter aluminum bars.

3. Thermal and Physical Properties of 7075 Large Diameter Aluminum Bar

Thermal Properties

Physical Properties

4. Manufacturing Process and Specification Range of Large Diameter Aluminum Bar

7075 large diameter aluminum bars generally refer to solid aluminum round bars with diameters ≥100mm, with common diameters ranging from 100mm to over 600mm. The production processes include:

• Melting + Homogenization: Improves structure and reduces element segregation;
• Hot Extrusion / Forging: Enhances structural density and strength consistency;
• T651 Heat Treatment: Relieves residual stress, ideal for high-precision CNC machining;
• Ultrasonic Testing (UT Level): Ensures no internal cracks or impurities;
• Surface Rough and Fine Processing: Custom cutting, rough turning, grinding, etc.

5. Typical Applications of 7075 Aluminum Bar

• Aerospace Aluminum Material: Widely used in aircraft structural parts, wing beams, and supports, improving aircraft performance.
• Mold Aluminum Bar: Excellent thermal conductivity and stability, ideal for manufacturing injection molds, blow molds, die-casting molds, and other molds requiring high strength and cutting properties.
• Military Equipment Manufacturing: Used in missile structures, light armored systems, and weapon components, meeting high-load operational conditions.
• High-End Rail and Automotive Parts: Includes racing car chassis, brake system brackets, connecting joints, improving performance through lightweight design.
• Industrial Automation Structural Parts: Used in robotic spindles, precision fixtures, and connecting joints, enhancing overall system rigidity and durability.

6. Material Selection and Procurement Recommendations for 7075 Aluminum Bar

When selecting a supplier for 7075 aluminum alloy bars, pay attention to the following aspects:

• Whether material certificates and ultrasonic inspection reports are provided;
• Whether the supplier has integrated capabilities for melting, extrusion, and heat treatment;
• Whether custom cutting / rough machining services are available;
• Whether batch stability and quick delivery times can be ensured;
• Whether the product meets standards such as AMS 4045, GB/T 3191, ASTM B221, etc.

As a representative of high-strength aluminum alloys, the 7075 large diameter aluminum bar combines strength, rigidity, fatigue resistance, and processing adaptability, making it the preferred structural material in many high-end manufacturing industries. By selecting the right state (such as 7075-T651), scientifically controlling the processing technology, and working with qualified suppliers, users can achieve optimal solutions in aerospace, military, mold, and automation fields.