7003 Aluminium-Legierung

Was ist 7003-Aluminium?

7003 gains strength from zinc and magnesium with a small zirconium addition for grain control. Its weldability is one of its key selling points: welded joints keep much more strength than those in 7075, so it is favored where large assemblies are welded rather than machined. Strength sits between 6061 and 7075.

Available 7003 Aluminum Products

Sheet / Coil

Parameter	Range
Dicke	0.3 – 150 mm
Breite	500 – 2600 mm
Länge	500 – 16000 mm
Gefühle	T5, T6, T651

Rohr

Parameter	Range
Außendurchmesser	6 – 300 mm
Wandstärke	0.5 – 40 mm
Länge	up to 12000 mm
Gefühle	T5, T6, T651

Stange / Stab

Parameter	Range
Durchmesser	3 – 300 mm
Länge	up to 12000 mm
Gefühle	T5, T6, T651

Technische Daten und gleichwertige Bezeichnungen

Bezeichnung	Reference
AA / UNS	A97003
EN AW	EN AW-7003 / AlZn6Mg0.8Zr
Common standards	ASTM B221, EN 755, GB/T 3191
Serie	7000 (Al-Zn-Mg)

Chemische Zusammensetzung

Element	Content (wt%)
Silizium (Si)	0,12 max
Eisen (Fe)	0,15 max
Kupfer (Cu)	0,20 max.
Mangan (Mn)	0,10 max
Magnesium (Mg)	2.20 – 2.70
Chrom (Cr)	0.05 – 0.20
Zink (Zn)	5.70 – 6.70
Zirkonium (Zr)	0.05 – 0.25
Titan (Ti)	0,20 max.
Andere, jeweils	0,05 max
Sonstige, insgesamt	0,15 max
Aluminium (Al)	Bilanz

Mechanische Eigenschaften je nach Temperierung

Temperament	Tensile (MPa)	Yield (MPa)	Dehnung (%)	Shear (MPa)
T6	340 – 400	300 – 340	8 – 12	280 – 380
T651	340 – 400	300 – 340	8 – 12	280 – 380
T5	300 – 350	250 – 300	10 – 14	200 – 240

Leitfaden zur Auswahl der Härtung

T6 / T651

Peak strength for welded frames and structural members where maximum load capacity is needed.

T5

Cooled from extrusion and artificially aged; good strength with lower cost than full T6 solution treatment.

Wesentliche Merkmale

Schweißeignung

Better weld retention than 7075/7050, ideal for welded assemblies.

Strength-to-weight

Stronger than 6061 at similar weight.

Korrosionsbeständigkeit

Good for 7000-series; acceptable in many transport environments.

Extrudierbarkeit

Readily extruded into complex profiles.

Anwendungen

• Rail and truck structural frames
• Bicycle, kayak, and sporting-goods structures
• Welded transport assemblies
• General structural extrusions

Hinweise zur Bearbeitung und Oberflächenveredelung

7003 welds well with TIG/MIG using 5356 or 5183 filler. Note that the heat-affected zone loses some strength, so design welds accordingly. It machines and anodizes acceptably, though 7xxx anodizing can show slight color variation. Post-weld artificial aging can recover part of the strength loss.

Qualitätsdokumente und Qualitätsprüfung

Every order ships with a Mill Test Certificate (MTC) recording composition and mechanical results. Our quality system is certified to ISO 9001, ISO 14001, and ISO 45001. Third-party SGS test reports can be arranged on request. Inspection covers dimensions, surface condition, and mechanical verification by temper.

Why Choose Linsy for 7003 Aluminum

Linsy Aluminum is a Shenzhen-based aluminum manufacturer with more than 20 years of experience supplying the 1000 to 8000 series in plate, bar, tube, wire, coil, profile, and block forms. For 7003 aluminum, we support both off-the-shelf ranges and made-to-order dimensions.

• Zertifizierungen: ISO 9001, ISO 14001, and ISO 45001 management systems.
• Documents: A Mill Test Certificate (MTC) is issued with every order; third-party SGS test reports are available on request.
• Processing: In-house CNC machining, TIG/MIG welding, laser cutting, and surface finishing (anodizing, polishing, mill finish, powder coating, PVC film).
• Lead time: Typical custom lead time is 10 to 60 days depending on temper, size, and quantity.
• Export: Shipped to 20+ countries across Europe, Asia, the Middle East, Africa, and the Americas.

Weiterführende Ressourcen

See the blog articles linked below for deeper background, and contact our team for a tailored quote on 7003 aluminum.

7003 Aluminum FAQ

How does 7003 compare to 7005?

Both are weldable medium-strength 7xxx alloys. 7005 carries a bit more manganese and is common in marine and rail welded structures; 7003 is widely used for extrusions in transport and sporting goods. Strength overlaps.

Is 7003 better than 6061 for welded frames?

Yes for strength: 7003 is stronger than 6061 after welding while remaining weldable. Choose 6061 when maximum corrosion resistance or simpler welding is the priority.

Does welding weaken 7003?

The heat-affected zone softens, as with most heat-treatable alloys. Design for the welded-zone strength, or apply post-weld aging where the spec allows.

Allgemeine Fragen zur Bestellung

What is the typical lead time for custom aluminum orders?

Custom sizes and tempers usually ship within 10 to 60 days. Confirm the exact window when you request a quote, as it depends on alloy, temper, dimensions, and order quantity.

Wie hoch ist die Mindestbestellmenge (MOQ)?

MOQ is flexible and reviewed case by case. Small lots and prototypes can often be accommodated; larger or standard runs are more economical. Share your required dimensions and quantity for a firm quote.

Which quality documents come with the order?

Every order ships with a Mill Test Certificate (MTC). ISO 9001, ISO 14001, and ISO 45001 certifications apply to our management system. SGS third-party test reports can be arranged on request.

Can you cut, machine, or finish the material before shipping?

Yes. We provide CNC machining, laser cutting, TIG/MIG welding, and surface treatments including anodizing, polishing, powder coating, and PVC film protection.

Wie kann ich ein Angebot anfordern?

Send your alloy/temper, required form, dimensions, quantity, and any processing or certificate requirements. Our team returns a quote with lead time and shipping terms.