QIDAMT
Product Overview
Aluminum Round Bar 2024 is a high-strength aluminum-copper-magnesium (Al-Cu-Mg) alloy rod, one of the most important aerospace structural alloys. It offers very high strength, excellent fatigue resistance, and good machinability, making it the standard choice for aircraft structures, defense components, and high-performance mechanical parts. Our 2024 aluminum round bars are available in T4, T3511 and T851 tempers, produced per ASTM B211, QQ-A-225/6, GB/T 3191 and EN 755 standards, with diameters from 3 mm to 400 mm and custom lengths.
Chemical Composition (%), ASTM B211 / GB/T 3190
Al (Aluminum): 90.7 – 94.7 (balance)
Cu (Copper): 3.8 – 4.9 (principal alloying element)
Mg (Magnesium): 1.2 – 1.8
Mn (Manganese): 0.3 – 0.9
Si (Silicon): 0.50 max
Fe (Iron): 0.50 max
Zn (Zinc): 0.25 max
Cr (Chromium): 0.10 max
Ti (Titanium): 0.15 max
Others Each: 0.05 max, Others Total: 0.15 max
Mechanical Properties (Typical Values, Bar)
Temper T4 (Solution Heat Treated & Naturally Aged): Tensile Strength 425-485 MPa, Yield Strength 275-345 MPa, Elongation 10-14%
Temper T3511 (T4 + Stress Relieved, Extruded): Tensile Strength 425-485 MPa, Yield Strength 290-360 MPa, Elongation 10-12%
Temper T851 (T6 + Stress Relieved, High Strength): Tensile Strength 455-510 MPa, Yield Strength 370-420 MPa, Elongation 4-6%
Temper O (Annealed): Tensile Strength 185-220 MPa, Yield Strength 75-125 MPa, Elongation 18-22%
Hardness: 120 HB (T4)
Fatigue Strength: 138 MPa (T4, at 5×10⁸ cycles)
Shear Strength: 280 MPa (T4)
Physical Properties
Density: 2.78 g/cm³ (0.100 lb/in³)
Melting Point: 502-638°C (935-1180°F)
Thermal Conductivity: 121 W/(m·K) at 25°C (T4)
Electrical Conductivity: 30% IACS (T4)
Electrical Resistivity: 5.7 × 10⁻⁸ Ω·m
Thermal Expansion Coefficient: 22.9 × 10⁻⁶/K (20-100°C)
Modulus of Elasticity: 73.1 GPa (10,600 ksi)
Poisson Ratio: 0.33
Specifications
Standards: ASTM B211, QQ-A-225/6, GB/T 3191, EN 755-2 / 755-3, AMS 4120, JIS H4040
Diameter: 3 mm – 400 mm (0.12″ – 15.7″)
Length: 1 m – 12 m (custom cutting available)
Temper: O, T4, T3511, T851
Type: Extruded bar, rolled bar, drawn bar, precision ground bar
Surface Finish: Mill finish, Bright, Drawn, Precision ground (h7-h9)
Tolerance: Diameter: ±0.1mm (drawn) to ±1.0mm (extruded), Straightness: ≤1mm/m
Special: Aerospace certification documentation (AMS/QQ-A) available on request
Key Features & Advantages
- Very high strength – one of the strongest aluminum alloys, up to 485 MPa tensile
- Excellent fatigue resistance – proven performance in aircraft cyclic loading
- High strength-to-weight ratio – the aerospace structural benchmark
- Good machinability – suitable for complex precision-machined parts
- Heat treatable – T4 and T851 tempers for different strength levels
- Good toughness at moderate temperatures
- Consistent properties – solution heat treated and stress relieved
- Proven in service – decades of aerospace and defense applications
- Available in precision ground condition for exacting tolerances
- Full material certification and traceability
Applications
- Aerospace – aircraft structural parts, fuselage frames, wing components, ribs
- Fasteners – aircraft bolts, screws, rivets, studs
- Defense – missile components, ordnance parts, military hardware
- Mold tooling – mold bases, insert components, tool holders
- Precision machinery – gears, shafts, valve stems, high-stress fasteners
- Automotive racing – suspension parts, drive components, chassis fittings
- Marine high-performance – propeller shafts, fittings (with protection)
- Sports equipment – high-performance bicycle and climbing components
- Electronics – high-strength connectors, structural elements
- General engineering – high-strength shafts, pins, couplings, custom parts
Quality Control & Testing
Every batch of our 2024 aluminum round bars undergoes strict quality control:
Chemical Analysis: Spectrometer verification of Cu, Mg, Mn content
Mechanical Testing: Tensile test, yield strength test, elongation test, hardness test (per temper)
Heat Treatment Verification: Hardness and conductivity testing to verify T4/T851 treatment
Ultrasonic Testing: UT inspection per AMS 2630 for aerospace applications (on request)
Dimensional Inspection: Diameter, roundness, straightness, and length checks
Surface Inspection: Visual inspection for scratches, laps, pits, and seams
Documentation: Mill Test Certificate (MTC), heat treatment records, material traceability, conformity certificate
Packaging & Shipping
Packaging: Standard export packaging – bars bundled with steel straps, protective paper or film wrapping, wooden pallets or crates for heavy bundles; individual protective tubes for precision ground and aerospace-grade bars
Marking: Alloy, temper, size, heat number, standard, manufacturer logo
Trade Terms: FOB, CIF, CFR, EXW, DDP
Payment: T/T (30% deposit, 70% before shipment), L/C at sight, Western Union, PayPal (sample orders)
Lead Time: Standard sizes in stock – 3-7 days; Custom sizes – 15-30 days
MOQ: 200 kg for standard sizes; custom orders negotiable
Loading Port: Qingdao, Shanghai, Tianjin, Ningbo, or as requested
Why Choose Us
With over 15 years of experience in aluminum manufacturing and export, we are a trusted supplier of 2024 aluminum round bars to aerospace, defense, and precision engineering companies in more than 50 countries. Our factory is equipped with modern extrusion, drawing, heat treatment, and precision grinding lines, ensuring aerospace-grade quality and consistency. We maintain large inventory of standard sizes and tempers for immediate delivery, and our experienced team can provide technical consultation, material certification support, and customized solutions for your specific applications. Contact us today for a competitive quote!
