Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of 7003 Aluminum Alloy Supplier | 7003 Aluminum Sheet Plate Tube Extrusion Manufacturer in China, also supports customized service. With abundant experience, we warmly welcome you to wholesale cheap products in stock here and get free sample from our factory. For price consultation, contact us.
Aluminum Alloy 7003 (also known as 7003 aluminum plate, 7003 aluminum extrusion, 7003 aluminum tube, AA7003) is a high-strength, weldable Al-Zn-Mg alloy widely used in rail transit structures, high-load frames, vehicle components, and industrial engineering applications.
Compared with traditional 7xxx alloys like 7075 or 7050, 7003 exhibits much better weldability and good corrosion resistance, making it one of the few 7-series alloys suitable for large welded structures.
Our factory supplies 7003 plates, extrusions, bars, tubes, and custom welded profiles, certified to international standards and suitable for global B2B markets.
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7003 Aluminum Alloy Product Overview
7003 aluminum alloy is a high-strength Al-Zn-Mg series aluminum alloy widely used in lightweight structural engineering applications requiring excellent weldability and reliable corrosion resistance. Compared with traditional 7xxx aluminum alloys, 7003 aluminum offers a superior balance between mechanical strength, fabrication performance, and welding stability.
As a professional manufacturer and exporter, Xi'an Dongmeng Group Co., Ltd supplies industrial-grade 7003 aluminum sheets, plates, tubes, pipes, bars, and extrusions for transportation, rail transit, bicycle manufacturing, industrial automation systems, and welded structural assemblies.
The alloy is especially suitable for applications where lightweight construction, dimensional stability, and high fatigue resistance are essential.
Chemical Composition (%)
| Element | Content (%) |
|---|---|
| Zinc (Zn) | 4.0 – 5.0 |
| Magnesium (Mg) | 0.6 – 1.2 |
| Copper (Cu) | ≤ 0.3 |
| Zirconium (Zr) | 0.08 – 0.25 |
| Manganese (Mn) | ≤ 0.5 |
| Silicon (Si) | ≤ 0.35 |
| Iron (Fe) | ≤ 0.40 |
| Others | ≤ 0.05 each |
| Aluminum (Al) | Balance |
Mechanical Properties (Typical)
| Temper | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| 7003-T5 | 300–350 | 260–300 | 10–14 |
| 7003-T6 | 360–420 | 310–360 | 9–12 |
| 7003-T62 | 380–430 | 320–380 | 8–10 |
| 7003-T651 | 380–450 | 330–400 | 8–10 |
Physical Properties of 7003 Aluminum Alloy
| Property | Value |
|---|---|
| Density | 2.78 g/cm³ |
| Thermal Conductivity | 130 W/m·K |
| Electrical Conductivity | 32% IACS |
| Melting Range | 610 – 650°C |
| Thermal Expansion | 23.5 ×10⁻⁶/K |
Available Specifications – Aluminum Alloy 7003
1. 7003 Aluminum Plates & Sheets (EN 485)
Thickness Range (Metric + Imperial)
| Thickness (mm) | Thickness (inch) | Width (mm) | Width (inch) | Length (mm) | Length (feet) | Notes |
|---|---|---|---|---|---|---|
| 1 – 3 | 0.04 – 0.12 | 600–1800 | 24–71 | 1000–6000 | 3.3–20 ft | Thin sheet |
| 4 – 10 | 0.16 – 0.39 | 800–2000 | 31–79 | 1000–6000 | 3.3–20 ft | Standard sheet |
| 12 – 25 | 0.47 – 0.98 | 1000–2200 | 39–87 | 1000–6000 | 3.3–20 ft | Medium plate |
| 30 – 80 | 1.18 – 3.15 | 1200–2500 | 47–98 | 1000–6000 | 3.3–20 ft | Structural plate |
| 90 – 150 | 3.54 – 5.91 | 1200–2500 | 47–98 | 2000–6000 | 6.5–20 ft | Customized |
Tolerances:
Thickness: EN 485-3 Class A/B
Flatness: ≤ 3 mm/m
Ultrasonic Testing (UT): Optional AMS-STD-2154 Class A/B
2. 7003 Extruded Structural Profiles (EN 755)
Common Sections & Sizes
| Profile Type | Size Range (mm) | Size Range (inch) | Applicable Use |
|---|---|---|---|
| H-Beams | 50–350 mm web | 2"–14" | Rail frames / Vehicle beams |
| U-Channels | 30×15 – 350×120 | 1.2×0.6 – 14×4.7" | Mechanical / structural |
| T-Shapes | 30–200 mm | 1.2–8" | Industrial assembly |
| Rectangular Profiles | 10×10 – 300×300 | 0.4×0.4 – 12×12" | Structural frames |
| Hollow Profiles | ID 20–250 mm | 0.8–10" | Lightweight structures |
| Multi-cavity Profiles | Custom | Custom | Rail vehicles / EV battery frames |
| Custom Extrusions | Up to 450 mm width | Up to 18" | Drawing-based |
Extrusion Tolerances:
EN 755-9 Standard
Straightness: ≤ 1.5 mm/m
Twist: ≤ 2 mm/m
3. 7003 Seamless & Extruded Tubes (EN 755-2)
| OD (mm) | OD (inch) | Wall Thickness (mm) | Wall Thickness (inch) | Length | Notes |
|---|---|---|---|---|---|
| 10 – 80 | 0.39 – 3.15 | 1.0 – 10 | 0.04 – 0.39 | 2000–8000 mm | Extruded tubes |
| 90 – 150 | 3.54 – 5.91 | 3 – 15 | 0.12 – 0.59 | 2000–8000 mm | Structural tubes |
| 160 – 300 | 6.30 – 11.8 | 5 – 30 | 0.20 – 1.18 | 2000–6000 mm | Heavy-wall tubes / customized |
Tube Tolerances:
OD tolerance: ISO h9 / h10
Wall tolerance: ±0.1–0.5 mm depending on size
4. 7003 Drawn Tube (High Precision)
| OD (mm) | Thickness (mm) | Tolerance | Notes |
|---|---|---|---|
| 8 – 60 | 0.8 – 5 | ±0.05 – 0.08 mm | For automated equipment & robotics |
5. 7003 Round Bars / Rods (EN 755-3)
| Diameter (mm) | Diameter (inch) | Length | Tolerance |
|---|---|---|---|
| 8 – 20 | 0.315 – 0.79" | 2–6 m | ISO h9 |
| 22 – 80 | 0.87 – 3.15" | 2–6 m | ISO h10 |
| 90 – 200 | 3.5 – 7.9" | 2–6 m | ISO h11 |
Application: Machined structural parts, joints, connectors
6. 7003 Square & Flat Bars
| Type | Size Range (mm) | Size Range (inch) |
|---|---|---|
| Square Bar | 10×10 – 200×200 | 0.4×0.4 – 8×8" |
| Flat Bar | 10×2 – 300×50 | 0.4×0.08 – 12×2" |
Key Features & Advantages
Excellent weldability (rare for 7xxx aluminum)
High strength comparable to some 6061-T6 and lower 7xxx
Good stress corrosion cracking resistance
Suitable for large welded structural components
Good toughness and formability
Lighter and stronger alternative to steel structures
Ideal for rail system engineering
Processing Performance Analysis
Excellent Extrusion Capability
7003 aluminum alloy demonstrates outstanding hot extrusion performance, making it ideal for complex industrial profiles and lightweight structural components.
Good Formability
The alloy provides stable forming behavior during bending, CNC machining, drilling, and structural fabrication processes.
CNC Machining Advantages
Benefits include:
Stable dimensional accuracy
Smooth cutting surface
Reduced tool wear
High production efficiency
Excellent surface finish consistency
Welding Performance Analysis
One of the key advantages of 7003 aluminum alloy is its superior weldability compared with conventional 7xxx aluminum alloys.
Welding Benefits
Reduced hot cracking tendency
Stable welded joint strength
Excellent structural integrity
Suitable for MIG and TIG welding
Recommended Welding Applications
Rail vehicle frames
Bicycle structures
Aluminum transportation systems
Industrial support frames
Corrosion Resistance Analysis
7003 aluminum alloy offers strong atmospheric corrosion resistance and performs well in outdoor structural environments.
Corrosion Resistance Features
Good oxidation resistance
Stable outdoor durability
Excellent moisture resistance
Reliable industrial weather resistance
Suitable Environments
Urban outdoor structures
Transportation systems
Industrial equipment
Humid operating environments
Industry Applications of 7003 Aluminum Alloy
Rail Transit Industry
Applications
Railway carriage structures
Subway frame systems
Lightweight transportation panels
Structural support components
Benefits
Weight reduction
High fatigue resistance
Excellent weldability
Long service life
Bicycle Manufacturing Industry
Applications
Bicycle frames
E-bike structures
Sports vehicle components
Lightweight tubing systems
Benefits
High strength-to-weight ratio
Excellent structural rigidity
Good vibration resistance
Improved riding durability
Automotive & Transportation Industry
Applications
Truck body structures
Trailer frames
Cargo systems
Structural reinforcement components
Benefits
Lightweight efficiency
Fuel-saving performance
Stable mechanical strength
Corrosion resistance
Industrial Equipment Industry
Applications
Automation frames
Machine supports
Industrial profiles
Structural assemblies
Benefits
Easy fabrication
High dimensional stability
Reliable long-term strength
Excellent processing consistency
Manufacturing Capability
Xi'an Dongmeng Group Co., Ltd maintains advanced aluminum processing production lines for industrial alloy manufacturing.
Production Equipment
Hot rolling lines
Precision extrusion lines
CNC machining centers
Heat treatment furnaces
Automatic cutting systems
Supply Capability
Custom dimensions
OEM processing
Export packaging
Small MOQ support
Fast global delivery
Inspection & Quality Assurance
Chemical composition analysis
Mechanical property testing
Ultrasonic testing (UT) for plates
Dimensional and straightness inspection
Weldability verification
Third-party inspection: SGS / BV / TUV
MTC (EN10204 3.1 / 3.2)
Why Choose Xi'an Dongmeng Group Co., Ltd
Professional Industrial Alloy Supplier
Extensive experience in aluminum and special alloy export manufacturing.
Stable Product Quality
Strict inspection procedures ensure reliable industrial performance.
Global Export Experience
Serving customers in:
Europe
North America
Southeast Asia
Middle East
South America
Custom Manufacturing Support
Custom cutting, machining, extrusion, and surface treatment services available.
Fast Quotation & Technical Support
Professional engineering support for industrial procurement projects.
Looking for the right aluminum alloy solution for your project?
Our engineering team is ready to support you with material selection, specification matching, machining options, and export documentation.
Our address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
Phone Number
+86 15769214734
FAQ
Q1: What distinguishes 7003 from other 7xxx series alloys (e.g., 7075, 7050)?
7003 is optimized for weldability and structural integrity, with slightly lower ultimate strength than 7075 but significantly better weld performance and stress corrosion cracking resistance, making it ideal for large welded structures in rail and vehicle applications.
Q2: Which tempers are available and what do they mean?
| Temper | Description | Typical Use |
|---|---|---|
| T5 | Cooled from elevated temperature shaping + artificial aging | Extrusions for moderate strength |
| T6 | Solution heat-treated + artificially aged | Highest strength extrusions & plates |
| T62 | Solution heat-treated + stress relieved + aged | Better dimensional stability |
| T651 | T6 + stress relieved by stretching | Plates & extrusions requiring precise machining |
Q3: Can 7003 aluminum be welded?
Yes. Unlike many 7xxx alloys, 7003 is weldable using MIG, TIG, and friction stir welding (FSW). Post-weld aging may be required to restore optimal mechanical properties. Avoid fusion welding on thick plates without proper pre/post-treatment.
Q4: What are the key mechanical properties for 7003?
Tensile Strength: 300–450 MPa (depending on temper and section)
Yield Strength: 260–400 MPa
Elongation: 8–14%
Good fatigue strength and moderate corrosion resistance
Q5: What standards are followed for 7003 supply?
EN 485 / EN 573 – plates & sheets
EN 755 – extrusions, tubes, profiles
JIS H4000 – Japanese standard
Custom standards – per client drawings and project specifications
All materials can be supplied with MTC 3.1 / 3.2, UT reports, and third-party inspection if required.
Q6: What forms and sizes can 7003 be supplied in?
Plates & Sheets: 1–150 mm thickness, 600–2500 mm width
Extruded Profiles: up to 450 mm width, hollow or multi-cavity
Tubes: OD 10–300 mm, wall thickness 1–30 mm
Bars / Rods: Ø10–200 mm, standard lengths 2–6 m
Welded Structural Frames: custom dimensions up to 8 m long
Q7: Can 7003 aluminum replace steel in structural applications?
Yes. 7003 is lightweight yet high-strength, especially suitable for rail transit frameworks, vehicle bodies, industrial machinery, and other load-bearing welded structures where weight reduction is critical.
Q8: What inspection and quality assurance is provided?
Chemical composition verification (spectrometer)
Mechanical property testing (tensile, yield, elongation, hardness)
Ultrasonic testing (UT) for plates
Dimensional & straightness inspection
Third-party inspection: SGS / BV / TUV available
Full documentation: MTC 3.1/3.2, CO/ROHS/REACH as needed
Q9: What is typical delivery time?
Stock plates/extrusions: 3–10 days
Custom extrusions/profiles: 15–30 days
Large welded structures: project-based, 20–45 days
Q10: Can 7003 be machined for precision components?
Yes. T651 plates and extrusions are ideal for CNC machining. Standard machining operations include milling, turning, drilling, and surface finishing. Stress relief may be needed for large sections to maintain dimensional stability.
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