7075 T6 Aluminum Round Bar

Supply Capacity: More Than 5000 Tons
Minimum Quantity: 20 Tons
Delivery Time: 3-45 Days
Delivery port: Shanghai, Tianjin, Qingdao, Ningbo, Guangzhou, etc.
Standard: ASTM, AISI, JIS, ISO, EN, BS, GB, etc.
Price Terms: FOB, CFR, CIF, etc.

1. Material Composition & Manufacturing Process

 

7075-T6 aluminum round bar represents the pinnacle of high-strength aluminum alloys, offering an exceptional combination of strength, hardness, and stress resistance for aerospace, defense, and high-performance mechanical applications:

Primary Alloying Elements:

Zinc (Zn): 5.1-6.1% (principal strengthening element)

Magnesium (Mg): 2.1-2.9% (enhances precipitation hardening)

Copper (Cu): 1.2-2.0% (improves strength and stress resistance)

Chromium (Cr): 0.18-0.28% (corrosion resistance and grain structure control)

Base Material:

Aluminum (Al): ≥87.1% (balance)

Controlled Impurities:

Iron (Fe): ≤0.50% max

Silicon (Si): ≤0.40% max

Manganese (Mn): ≤0.30% max

Titanium (Ti): ≤0.20% max

Other elements: ≤0.05% each, ≤0.15% total

Premium Manufacturing Process:

Melt Preparation:

Primary high-purity aluminum (99.7% minimum)

Precise alloying element additions with ±0.1% tolerance

Advanced filtration through ceramic foam filters (30-40 ppi)

SNIF degassing treatment (hydrogen < 0.10 ml/100g)

Grain refinement with Al-Ti-B master alloy

Direct-chill (DC) semi-continuous casting

Homogenization:

460-480°C for 24-48 hours

Uniform temperature control: ±5°C

Controlled cooling rate: 20-30°C/hour

Dissolution of coarse intermetallics

Microsegregation elimination

Hot Working Process:

Breakdown forging/rolling: 385-415°C

Intermediate operations: 370-400°C

Final hot working: 350-380°C

Computerized temperature monitoring throughout

Solution Heat Treatment:

465-485°C for 1-2 hours (diameter dependent)

Temperature uniformity: ±3°C

Rapid transfer to quenching medium

Maximum transfer time: 10 seconds

Quenching:

Cold water (10-30°C)

Agitation for uniform cooling

Minimum cooling rate: 100°C/sec at surface

Cold Stretching (T651):

1.5-3.0% permanent deformation

Stress relief and straightening

Dimensional accuracy enhancement

Artificial Aging (T6):Dual-stage aging process:

First stage: 110-130°C for 4-6 hours

Second stage: 165-175°C for 8-12 hours

Temperature uniformity: ±3°C

Controlled cooling after aging

Final Processing:

Precision centerless grinding (optional)

Stress-free straightening

Nondestructive testing

Surface treatment and protection

Full process traceability with computerized quality monitoring at all stages.

 

 

2. Mechanical Properties of 7075-T6 Aluminum Round Bar

 

Property Minimum Typical Range Test Method
Ultimate Tensile Strength 570 MPa 580-600 MPa ASTM E8
Yield Strength (0.2%) 500 MPa 510-540 MPa ASTM E8
Elongation (2 inch) 7% 8-11% ASTM E8
Hardness (Brinell) 150 HB 155-165 HB ASTM E10
Fatigue Strength (5×10⁸) 160 MPa 170-190 MPa ASTM E466
Shear Strength 330 MPa 340-360 MPa ASTM B769
Fracture Toughness (K₁c) 24 MPa√m 25-29 MPa√m ASTM E399
Compressive Yield Strength 520 MPa 530-550 MPa ASTM E9
Modulus of Elasticity 71.7 GPa 71.7-72.4 GPa ASTM E111

 

Property Distribution:

Longitudinal to transverse property ratio: 1.00:0.95 (strength), 1.00:0.75 (elongation)

Variation across diameter: <5% for diameters up to 75mm, <8% for diameters >75mm

Core to surface hardness variation: <10 HB for diameters up to 100mm

Property stability: <3% strength reduction after 10,000 hours at 100°C

Stress Corrosion Cracking Threshold: 125-175 MPa (dependent on environment)

 

 

3. Microstructural Characteristics

 

Key Microstructural Features:

Grain Structure:

Partially recrystallized structure with elongated grains

ASTM grain size 7-9 (32-16μm)

Aspect ratio: 2:1 to 4:1 (length:width)

Well-controlled grain flow pattern

Precipitate Distribution:

MgZn₂ (η/η’) strengthening precipitates: 5-15nm

CuMgAl₂ (S-phase) precipitates

Al₇Cu₂Fe intermetallics: Controlled size and distribution

Al₁₂Mg₂Cr dispersoids: 50-200nm

Texture Development:

Strong <111> and <100> fiber textures

Texture intensity: 3-8× random

Optimized for maximum strength in primary loading directions

Special Features:

Precipitation-hardened microstructure

Minimal precipitate-free zones (PFZs) at grain boundaries

Controlled distribution of coarse intermetallics

Fine dispersoid distribution for recrystallization control

 

 

4. Dimensional Specifications & Tolerances

 

Parameter Standard Range Precision Tolerance Commercial Tolerance Test Method
Diameter 10-250 mm ±0.10mm up to 30mm ±0.20mm up to 30mm Micrometer
±0.4% above 30mm ±0.7% above 30mm
Ovality N/A 50% of diameter tolerance 75% of diameter tolerance Micrometer
Length 2000-6000 mm ±2mm ±5mm Tape measure
Straightness N/A 0.2mm/m 0.5mm/m Straightedge
Surface Roughness N/A 1.6 μm Ra max 3.2 μm Ra max Profilometer
Cut End Squareness N/A 0.5° max 1.0° max Protractor

 

Standard Available Forms:

Diameters: 10mm to 250mm (larger sizes available on request)

Standard Lengths: 2000mm, 3000mm, 4000mm, 6000mm

Custom cut lengths available

Centerless ground bars available for precision applications

Saw-cut ends with protective end caps

 

 

5. Temper Designations & Heat Treatment Options

 

Temper Code Process Description Optimal Applications Key Characteristics
T6 Solution heat treated and artificially aged High-strength applications Maximum strength and hardness
T651 T6 + stress relieved by stretching Critical aerospace components Improved stress corrosion resistance
T73 Overaged for stress corrosion resistance Corrosion-critical applications Better SCC resistance with reduced strength
T76 Modified overaging treatment Balanced properties Compromise between T6 and T73
T7351 T73 + stress relieved by stretching Thick sections with residual stress concerns Dimensional stability with SCC resistance

 

Temper Selection Guidance:

T6/T651: Highest strength requirements

T73/T7351: Stress-corrosion critical applications

T76: Balanced properties for general aerospace applications

 

 

6. Machining & Fabrication Characteristics

 

Operation Tool Material Recommended Parameters Comments
Turning Carbide, PCD Vc=150-300 m/min, f=0.1-0.3 mm/rev Sharp tools essential
Drilling HSS-Co, Carbide Vc=60-120 m/min, f=0.15-0.35 mm/rev Frequent chip clearing
Milling Carbide, PCD Vc=180-350 m/min, fz=0.05-0.15 mm Climb milling preferred
Tapping HSS-Co, TiN coated Vc=10-20 m/min Thread quality sensitive to heat
Reaming Carbide, PCD Vc=40-90 m/min, f=0.1-0.3 mm/rev H7 tolerance achievable
Thread Milling Carbide Vc=100-200 m/min, fz=0.03-0.08 mm Preferred over tapping for critical threads

 

Fabrication Guidance:

Machinability Rating: 70% (1100 aluminum = 100%)

Surface Finish: Good (Ra 0.8-3.2μm achievable)

Chip Formation: Short to medium chips with proper tooling

Coolant: Water-soluble emulsion preferred (8-10% concentration)

Tool Wear: Moderate with proper parameters

Cutting Forces: Higher than other aluminum alloys

Weldability: Poor (not recommended for structural applications)

Cold Working: Limited formability

Hot Working: Not recommended in T6 condition

Heat Treatment: Can be fully re-heat treated after machining

 

 

7. Corrosion Resistance & Protection Systems

 

Environment Type Resistance Rating Protection Method Expected Performance
Industrial Atmosphere Fair Anodizing + paint 3-5 years with maintenance
Marine Environment Poor Anodizing + chromate + paint 2-3 years with maintenance
High Humidity Fair Anodizing Type II 1-2 years without additional protection
Stress Corrosion Poor in T6, Good in T73 Proper temper selection Application specific
Exfoliation Poor Proper temper + protection Critical in marine applications
Galvanic Corrosion Poor with carbon steels Isolation or sacrificial protection Requires careful design

 

Surface Protection Options:

Anodizing:

Type I (Chromic): 2-8μm (aerospace grade)

Type II (Sulfuric): 10-25μm (general purpose)

Type III (Hard): 25-75μm (wear resistance)

Sealing options: Hot water, dichromate, nickel acetate

Conversion Coatings:

Chromate per MIL-DTL-5541 Class 1A

Non-chromium alternatives for environmental compliance

Painting Systems:

Epoxy primer + polyurethane topcoat

Aerospace-qualified systems available

Mechanical Protection:

Shot peening for enhanced fatigue and SCC resistance

Glass bead blasting for uniform appearance

8. Physical Properties for Engineering Design

 

Property Value Design Consideration
Density 2.81 g/cm³ Weight calculation for components
Melting Range 477-635°C Heat treatment limitations
Thermal Conductivity 130-150 W/m·K Thermal management design
Electrical Conductivity 33-40% IACS Electrical applications design
Specific Heat 860 J/kg·K Thermal mass calculations
Thermal Expansion (CTE) 23.4 ×10⁻⁶/K Thermal stress analysis
Young’s Modulus 71.7 GPa Deflection and stiffness calculations
Poisson’s Ratio 0.33 Structural analysis parameter
Magnetic Permeability ~1.00 (non-magnetic) Electronic applications

 

Design Considerations:

Operating Temperature Range: -70°C to +120°C

Property Retention: Excellent below 100°C, gradual degradation above

Stress Relaxation: Minimal below 100°C

Fatigue Life: Superior to most aluminum alloys

Notch Sensitivity: Moderate to high

Cryogenic Performance: Good strength retention at low temperatures

Vibration Damping: Poor (typical of high-strength aluminum)

9. Quality Assurance & Testing

 

Standard Testing Procedures:

Chemical Composition:

Optical emission spectroscopy

X-ray fluorescence analysis

Verification of all major elements and impurities

Mechanical Testing:

Tensile testing (longitudinal and transverse)

Hardness testing (Brinell, Rockwell B)

Impact testing (when required)

Fatigue testing (for critical applications)

Dimensional Inspection:

Diameter/ovality at multiple locations

Straightness verification

Length measurement

Nondestructive Testing:

Ultrasonic inspection per AMS-STD-2154

Eddy current testing for surface defects

Penetrant inspection (critical applications)

Microstructural Analysis:

Grain size determination

Intermetallic particle evaluation

Exfoliation corrosion susceptibility (ASTM G34)

Standard Certifications:

Mill Test Report (EN 10204 3.1)

Chemical analysis certification

Mechanical properties certification

Heat treatment certification

Nondestructive testing certification

Material traceability documentation

10. Applications & Design Considerations

 

Primary Applications:

Aerospace Components:

Aircraft landing gear components

Wing spars and structural elements

Fuselage frames and bulkheads

Engine mounts and supports

Defense Applications:

Missile components

Weapons systems parts

Armored vehicle components

Tactical equipment fixtures

High-Performance Automotive:

Drive shafts

Suspension components

Connecting rods

Performance-critical fasteners

Industrial Equipment:

High-stress machine parts

Molds for plastic injection

Hydraulic system components

Robotics and automation components

Specialized Applications:

Precision instrument components

High-performance sporting equipment

Rock climbing equipment

Camera mounting systems

Design Advantages:

Exceptional strength-to-weight ratio

Superior fatigue performance

High resistance to mechanical wear

Excellent machining characteristics

Dimensional stability after machining

Reliable performance in high-stress applications

Comprehensive material database for engineering design

Wide availability in standard sizes

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