3003-O/H14/H22 Aluminium-Flachstahl

What Is 3003 Aluminum Flat Bar?

3003 aluminum flat bar is a rectangular cross-section bar made from 3003 Al-Mn (aluminum-manganese) alloy. As a non-heat-treatable wrought alloy, 3003 derives its strength from cold working rather than precipitation hardening. The flat bar form is typically produced by extrusion (in H112 or F temper) or by cutting from strain-hardened sheet/strip stock (in H14, H22, or O temper).

With 1.0–1.5% manganese as its primary alloying element, 3003 offers approximately 20% higher strength than commercially pure 1100 aluminum while retaining excellent corrosion resistance, formability, and weldability. It is widely specified for chemical equipment, storage tanks, ductwork, and general fabrication where flat bar stock is required for machining, welding, or structural framing.

Common tempers for 3003 flat bar include O (fully annealed, maximum formability), H14 (half hard, good balance of strength and formability), and H22 (strain-hardened then partially annealed, stable strength with good formability). Linsy supplies 3003 flat bars in these tempers with custom cut-to-length, surface finishing, and MTC reports available for every order.

Available 3003 Aluminum Flat Bar — Dimensions & Tempers

Linsy supplies 3003 aluminum flat bars in standard and custom sizes. Both metric and imperial dimensions are available. Custom cut-to-length, edge rounding, and surface finishing (mill finish, anodized, or brushed) can be specified at order.

3003 Aluminum Flat Bar — Standard Dimensions

Dicke (mm)	Breite (mm)	Länge (mm)	Häufige Temperamente
3 – 6	20 – 150	1000 – 6000 (custom on request)	O, H14, H22
6 – 12	25 – 200	1000 – 6000 (custom on request)	O, H14, H112
12 – 50	30 – 300	1000 – 6000 (custom on request)	O, H112, F

Note: Thickness, width, and length can be customized to your drawing or specification. Contact us with your required dimensions for a quick quote.

3003 Aluminum Specifications & Equivalent Designations

3003 aluminum flat bar is supplied in accordance with major international standards. If your project requires a specific standard or certificate, please specify it when requesting a quote.

Standard	Bezeichnung
AA (Aluminiumverband)	3003
UNS	A93003
EN / DIN	EN AW-3003 / AlMn1Cu
ISO	AlMn1Cu
JIS H 4000	A3003
GB/T 3190	3003
ASTM B211	3003 bar, rod, and wire
ASTM B221	3003 extruded bar, rod, wire, profiles

Chemical Composition of 3003 Aluminum

The following chemical composition limits apply to 3003 aluminum per ASTM B211 and EN 573-3. All values are weight percent (%).

Element	Min %	Max %
Silizium (Si)	—	0.6
Eisen (Fe)	—	0.7
Kupfer (Cu)	0.05	0.20
Mangan (Mn)	1.0	1.5
Magnesium (Mg)	—	0.05
Chrom (Cr)	—	0.05
Zink (Zn)	—	0.10
Titan (Ti)	—	0.05
Others Each	—	0.05
Others Total	—	0.15
Aluminium (Al)	—	Bilanz

Mechanische Eigenschaften je nach Temperierung

The mechanical properties of 3003 flat bar depend on the temper and the product form (extruded vs. cut from sheet). The values below are typical for bar and extruded stock. Always request an MTC report for certified values on your specific batch.

3003-O (Annealed)

Eigentum	Typischer Wert
Zugfestigkeit (MPa)	95 – 130
Streckgrenze (MPa)	≥ 35
Dehnung (%)	≥ 25
Härte (Brinell)	~ 28

3003-H14 (Half Hard, from Sheet Stock)

Eigentum	Typischer Wert
Zugfestigkeit (MPa)	140 – 180
Streckgrenze (MPa)	≥ 115
Dehnung (%)	≥ 5
Härte (Brinell)	~ 40

3003-H112 (As-Extruded)

Eigentum	Typischer Wert
Zugfestigkeit (MPa)	95 – 145
Streckgrenze (MPa)	≥ 35
Dehnung (%)	≥ 18

3003 Aluminum Temper Selection Guide

Select the right temper for your flat bar application based on the required strength, formability, and post-machining stability.

Temperament	Beschreibung	Wichtigster Vorteil	When to Use for Flat Bar
O	Annealed — fully soft	Maximum formability and ductility	Bending, forming, or welding where maximum ductility is required
H14	Strain-hardened, 1/2 hard	Good balance of strength and formability	General fabrication, brackets, flat patterns that need moderate strength
H22	Strain-hardened then partially annealed	Stable strength with good formability	Flat bar that will be formed after delivery; better stability than H14
H112	As-extruded	No special control — economical	Structural flat bar where surface finish is less critical

Key Characteristics of 3003 Aluminum Flat Bar

Korrosionsbeständigkeit

3003 aluminum offers excellent resistance to atmospheric corrosion, including in marine and industrial environments. The manganese addition suppresses intergranular corrosion, making 3003 suitable for outdoor structural applications, chemical storage, and marine non-critical parts. It performs well in contact with fresh water, mild chemicals, and food products without requiring protective coating.

Umformbarkeit und Schweißbarkeit

3003 flat bar in O or H14 temper can be cold bent, drilled, tapped, and machined with standard tools. It is rated as highly weldable by TIG (GTAW), MIG (GMAW), and resistance welding. Filler metal 4043 or 1100 is recommended. Note that welding anneals the heat-affected zone in strain-hardened tempers, reducing local strength — consider using O temper bar if extensive welding is required.

Bearbeitbarkeit

3003 has fair machinability — softer than heat-treatable alloys like 6061 or 2011. Use sharp tools, positive rake angles, and appropriate cutting speeds to avoid built-up edge. O temper machines more smoothly than H14; chip breakers are recommended for continuous cuts.

Common Applications of 3003 Aluminum Flat Bar

Industrie	Anwendungen	Why 3003 Flat Bar Is Used
Chemische Verarbeitung	Tank supports, framing, pipe brackets, walkways	Corrosion resistance, weldability, moderate strength
HVAC & Ductwork	Duct flanges, mounting bars, support frames	Formability, corrosion resistance, weldability
Allgemeine Fertigung	Brackets, base plates, spacers, machine guards	Good workability, readily available, cost-effective
Storage & Transport	Tank straps, trailer frames, cargo tie-down bars	Weldability, corrosion resistance, moderate strength
Architektonisch	Trim, flashing details, decorative flat stock	Good surface finish acceptance, formability, corrosion resistance
Food & Beverage	Food processing equipment frames, washdown brackets	Food-safe, corrosion resistant, easy to clean (no reactive contaminants)

Processing & Surface Finish Notes for 3003 Flat Bar

Linsy can supply 3003 flat bar with processing and finishing options applied before delivery:

• Schneiden: CNC band saw, circular saw, or waterjet cutting to custom lengths and shapes. Standard cut tolerance is ±0.5 mm; tighter tolerance available on request.
• Zerspanung: Drilling, tapping, countersinking, and light CNC milling are available. 3003 machines best in O temper; H14 may work-harden during cutting.
• Surface Finish: Mill finish is standard. Anodizing (clear or colored), brushing, and polishing are available. Note: 3003 anodizes to a slightly yellowish-grey tone (not the bright silver of 6061) due to its manganese content — this is normal and does not indicate a defective anodized layer.
• Formung: O temper flat bar can be bent to tight radii without cracking. H14 temper can be bent to moderate radii; always test-bend a sample if your application requires tight bends.
• Schweißen: 3003 flat bar is fully weldable. Post-weld annealing is not required for O temper; H14 parts may soften in the heat-affected zone after welding.

Qualitätsdokumente und Qualitätsprüfung

Linsy provides the following quality documentation with every 3003 flat bar order:

• MTC Report (Material Test Certificate): Included with every shipment as standard. Certifies chemical composition and mechanical properties per batch.
• SGS Test Reports: Available on request for third-party verification of material properties.
• Dimension Inspection Report: Available on request for precision or safety-critical applications.
• RoHS / REACH Compliance: Available on request confirming material compliance with EU directives.

All Linsy facilities are certified under ISO 9001, ISO 14001 und ISO 45001. Mill test certificates reference the applicable ASTM or EN standard used in production.

Why Choose Linsy for 3003 Aluminum Flat Bar

• ISO-Certified Quality: All Linsy production facilities are certified under ISO 9001, ISO 14001, and ISO 45001. Every flat bar shipment includes an MTC report as standard.
• Custom Sizes & Low MOQ: From prototype quantities to full production runs. Custom thickness, width, length, and surface finish are available even at low order volumes.
• Broad Temper Availability: O, H14, H22, H112, and F tempers in stock or on short lead time. No need to compromise on tempers for your project.
• Processing Services: Cut-to-length, CNC machining, surface finishing, and welding support available in-house — reducing your downstream handling and lead time.
• Global Delivery: 10–60 days lead time depending on specification and order volume. Shipped to 20+ countries with export-standard packaging.
• Technical Support: Linsy engineers can assist with temper selection, formability assessment, and welding recommendations for your specific application.

Weiterführende Ressourcen

• Ultimate Guide to 3003 Aluminum Alloy
• Der ultimative Leitfaden für 3003 H14-Aluminium
• 3003 vs 6061 Aluminum — In-Depth Comparison

3003 Aluminum Flat Bar FAQ

What is the difference between 3003-H14 and 3003-H22 flat bar?

H14 is strain-hardened only (higher strength, less formable). H22 is strain-hardened then partially annealed (slightly lower strength, better formability and stability). Choose H22 if the bar will be formed after delivery.

Can 3003 flat bar be used in marine environments?

3003 has good atmospheric corrosion resistance and is suitable for non-immersed marine applications (handrails, brackets, enclosures). For immersed saltwater service, 5052 or 5083 is recommended due to superior pitting resistance.

What filler wire should I use when welding 3003 flat bar?

4043 or 1100 filler wire is recommended for TIG and MIG welding of 3003. 4043 gives better color match after anodizing; 1100 is preferred when maximum corrosion resistance in the weld is required.

What is the typical lead time for custom 3003 flat bar sizes?

Standard sizes are available from stock or with 10–60 days lead time. Custom cut-to-length or non-standard dimensions typically ship within 15–45 days depending on volume and temper. Contact us for a lead time estimate on your specific requirement.

Does 3003 flat bar come with mill test certification?

Yes — every Linsy 3003 flat bar shipment includes an MTC (Material Test Certificate) as standard, documenting chemical composition and mechanical properties for the production batch.

Can 3003 flat bar be anodized for architectural use?

Yes. Note that 3003 anodizes to a slightly warm (yellowish-grey) tone rather than the bright silver appearance of anodized 6061, due to its manganese content. For a specific color match, request an anodizing sample before ordering in volume.

Allgemeine Fragen zur Bestellung

What is the minimum order quantity (MOQ) for 3003 flat bar?

Linsy supports low MOQs for standard tempers and sizes. Custom dimensions or tempers may require higher minimums. Contact us with your requirement for a specific MOQ quote.

Can I order a small quantity for prototyping before a full production run?

Yes — Linsy welcomes prototype and small-batch orders. Many standard sizes are available from stock for immediate shipment.

What packaging is used for 3003 flat bar exports?

Export-standard packaging includes PVC wrap, end caps, and wooden crates or pallets suitable for ocean or air freight. Custom packaging is available for high-value or sensitive-finish orders.

Does Linsy provide material certification for EU or North American projects?

Yes — MTC reports are provided as standard. SGS test reports, RoHS/REACH compliance certificates, and EN 10204 3.1 / 3.2 certification are available on request.

Can Linsy supply 3003 flat bar cut to a specific length and width?

Yes — cut-to-length and cut-to-width are standard services. Provide your required dimensions and tolerances when requesting a quote.

What information should I include in my inquiry for 3003 flat bar?

Please include: alloy (3003), temper (O/H14/H22/etc.), thickness, width, length, quantity, required standard (ASTM/EN/GB), and any surface finish or processing requirements. The more detail you provide, the faster we can respond with an accurate quote.