Aluminium Alloy 7075 Round Bars

What is Aluminium Alloy 7075 Round Bar?

Aluminium Alloy 7075 is part of the 7xxx series, where zinc is the primary alloying element. This alloy is heat-treatable and is valued for its high tensile strength, toughness, and fatigue resistance.

Key features of Aluminium 7075 round bars:

• Extremely high strength-to-weight ratio
• Excellent fatigue resistance under cyclic loading
• Good corrosion resistance, especially in T6 temper
• Heat-treatable to enhance hardness and mechanical performance
• Lightweight yet mechanically robust
• High dimensional stability

7075 aluminium round bars are widely used in aerospace structural components, automotive frames, defense machinery, and high-stress industrial applications.

Key Features of Aluminium Alloy 7075 Round Bars

• Superior tensile strength and yield strength for heavy-duty applications
• Excellent fatigue and impact resistance for aerospace and defense use
• Heat-treatable to T6/T651 temper for maximum mechanical performance
• Lightweight yet exceptionally strong for critical structural components
• Good machinability with proper tooling and coolant
• Moderate corrosion resistance, further enhanced with coatings or anodizing
• Non-magnetic in annealed condition, suitable for sensitive applications

These properties make 7075 aluminium round bars ideal for aerospace, defense, automotive, and high-performance industrial applications.

Chemical Composition of Aluminium Alloy 7075 (%)

• Zinc (Zn): 5.1 – 6.1%
• Magnesium (Mg): 2.1 – 2.9%
• Copper (Cu): 1.2 – 2.0%
• Chromium (Cr): 0.18 – 0.28%
• Manganese (Mn): ≤ 0.3%
• Iron (Fe): ≤ 0.5%
• Silicon (Si): ≤ 0.4%
• Titanium (Ti): ≤ 0.2%
• Aluminium (Al): Balance

Role of Alloying Elements

• Zinc: Increases strength and hardness
• Magnesium: Improves fatigue resistance and toughness
• Copper: Enhances strength and hardness
• Chromium: Provides corrosion resistance and reduces stress corrosion cracking
• Aluminium: Provides ductility and lightweight properties

This combination ensures high mechanical performance, fatigue resistance, and structural reliability in 7075 aluminium round bars.

Mechanical Properties of Aluminium Alloy 7075 Round Bars

Aluminium Alloy 7075 exhibits exceptional mechanical properties, particularly in T6/T651 heat-treated condition:

• Tensile Strength: 540 – 570 MPa
• Yield Strength: 480 – 520 MPa
• Elongation: 7 – 11%
• Brinell Hardness: 150 – 160 HB

These properties make Aluminium 7075 round bars suitable for aerospace frameworks, high-performance automotive components, and structural machinery.

Physical Properties of Aluminium Alloy 7075 Round Bars

• Density: 2.81 g/cm³
• Melting Range: 477 – 635°C
• Thermal Conductivity: 130 – 150 W/m·K
• Electrical Conductivity: 33% IACS
• Modulus of Elasticity: 71.7 GPa
• Coefficient of Thermal Expansion: 23.5 µm/m°C

The combination of lightweight, high strength, and thermal stability makes 7075 aluminium round bars ideal for aerospace, defense, and industrial applications.

Heat Treatment of Aluminium Alloy 7075 Round Bars

Aluminium Alloy 7075 is heat-treatable, and its mechanical properties can be significantly enhanced through artificial aging:

Solution Heat Treatment (T6)

• Heat to 470 – 480°C
• Rapid water quenching
• Artificial aging at 120 – 140°C for several hours

T651 Temper

• Solution heat-treated and stress-relieved by stretching
• Ensures dimensional stability and improved mechanical properties

Proper heat treatment ensures Aluminium Alloy 7075 bars maintain high tensile strength, fatigue resistance, and surface integrity.

Machinability of Aluminium Alloy 7075 Round Bars

7075 aluminium round bars are moderately machinable, particularly in T6 temper:

• Compatible with turning, milling, drilling, and CNC machining
• Use sharp carbide tools and cutting fluids to prevent heat generation
• Produces smooth surface finishes with precise tolerances
• Suitable for aerospace components, automotive shafts, and precision machinery

Corrosion Resistance of Aluminium Alloy 7075 Round Bars

• Moderate corrosion resistance in atmospheric environments
• Performance improves with anodizing or protective coatings
• Not recommended for continuous exposure to marine environments without protection
• Performs well in indoor, aerospace, and industrial applications

Proper surface treatment ensures long-term durability and corrosion protection.

Weldability of Aluminium Alloy 7075 Round Bars

Aluminium Alloy 7075 is weldable but requires caution:

• TIG (GTAW) and MIG (GMAW) welding possible
• Preheating and post-weld heat treatment recommended to minimize cracking
• Filler metals such as 5356 may be used for moderate corrosion resistance
• Welded joints are generally slightly lower in strength than base metal

Available Sizes & Specifications

Aluminium Alloy 7075 Round Bars are supplied in:

Standards:

• ASTM B221
• ISO 6361
• EN 573 / 485

Size Range:

• Diameter: 6 mm – 250 mm
• Length: 3 m, 6 m, or customized cut lengths
• Tolerances: As per ASTM / ISO standards

Surface Finish:

• Hot Rolled / Bright
• Polished
• Centerless Ground

Applications of Aluminium Alloy 7075 Round Bars

Aluminium Alloy 7075 is widely used in aerospace, defense, automotive, and high-performance industrial applications:

Aerospace & Defense

• Aircraft structural components
• Helicopter and aerospace frameworks
• Missile and defense machinery components

Automotive & Transportation

• High-performance vehicle frames and chassis
• Gears, shafts, and structural automotive components
• Aerospace and racing car components

Industrial & Mechanical

• Tooling, dies, and fixtures
• High-strength mechanical shafts and rods
• Precision machinery components

Other Applications

• Marine fittings (with protective coatings)
• Aerospace assemblies exposed to moderate corrosive environments
• High-stress industrial machinery requiring lightweight, strong materials

Advantages of Aluminium Alloy 7075 Round Bars

• Extremely high strength-to-weight ratio
• Excellent fatigue resistance for cyclic loading applications
• Heat-treatable to T6/T651 for maximum mechanical performance
• Moderate corrosion resistance, further enhanced with coatings
• Machinable for precision parts
• Lightweight and durable for aerospace, defense, automotive, and industrial applications
• Non-magnetic in annealed condition

Quality Testing & Inspection

All Aluminium Alloy 7075 round bars undergo:

• Chemical composition analysis
• Mechanical property testing
• Hardness testing
• Dimensional inspection
• Surface finish verification

Mill Test Certificates (MTC) are provided per ASTM and ISO standards. Third-party inspection is available upon request.

Why Choose Virami Steel Hub for Aluminium Alloy 7075 Round Bars?

• Trusted aluminium alloy manufacturer and supplier in Mumbai, India
• High-quality aerospace, automotive, and industrial-grade aluminium alloys
• Competitive global pricing and fast delivery
• Custom sizes, lengths, and temper options
• Certified quality assurance and MTC
• Expertise in aerospace, defense, automotive, and industrial engineering applications

Conclusion

Aluminium Alloy 7075 Round Bars are premium-grade, heat-treatable aluminium-zinc alloys offering exceptional strength, fatigue resistance, and machinability. Ideal for aerospace, defense, automotive, and industrial applications, Aluminium 7075 ensures durability, high-performance, and lightweight structural integrity.

Virami Steel Hub supplies certified Aluminium Alloy 7075 Round Bars with customizable sizes and temper options, making it the preferred choice for critical engineering, aerospace, and high-strength industrial applications.