3003 aluminum round tube combines the proven corrosion resistance and formability of the Al-Mn 3003 alloy family with the structural and fluid-handling advantages of tubular form. Supplied in O (annealed), H14 (half-hard), and H22 (strain-hardened and partially annealed) tempers, 3003 round tubes are widely specified for heat exchangers, hydraulic lines, chemical processing equipment, and general-purpose structural tubing where moderate strength and excellent weldability are required. Linsy offers 3003 round tubes in outer diameters from 6 mm to 300 mm with wall thicknesses from 0.5 mm to 30 mm, cut to your specified length. Every shipment includes a full Mill Test Certificate (MTC), and third-party SGS test reports are available on request. For projects involving further fabrication, our in-house CNC machining, TIG/MIG welding, polishing, and anodizing services can deliver finished tube assemblies ready for installation.
Formulaires disponibles : round tube (OD 6–300 mm, WT 0.5–30 mm)
Tempéraments courants : O / H14 / H22
Assistance technique : CNC machining / cutting to length / polishing / anodizing
Documents relatifs à la qualité : Rapport MTC joint à chaque commande
Tube rond en aluminium 3003 is a hollow cylindrical product made from the widely used 3003 Al-Mn wrought alloy. With 1.0–1.5% manganese as its principal alloying element, 3003 delivers approximately 20% higher strength than commercially pure 1100 aluminum while maintaining outstanding corrosion resistance, formability, and weldability. As a non-heat-treatable alloy, 3003 derives its mechanical properties from cold working, with O (fully annealed), H14 (half-hard), and H22 (strain-hardened and partially annealed) being the most commonly specified tempers for tube applications. The tubular form provides an excellent strength-to-weight ratio for fluid transport, structural framing, and heat exchange duties, while the alloy’s inherent corrosion resistance eliminates the need for protective coatings in most indoor and sheltered outdoor environments. 3003 round tubes are also highly compatible with all common welding methods and can be bent, flared, and end-formed without cracking in the annealed or H22 conditions.
Linsy supplies 3003 aluminum round tubes in a practical range of outer diameters, wall thicknesses, and tempers. Standard stock dimensions are listed below. Custom OD/WT combinations, tighter tolerances, and specific cut lengths are available on request.
| Alliage | Tempérer | Diamètre extérieur (mm) | Épaisseur de la paroi (mm) | Longueur (mm) | Standard |
|---|---|---|---|---|---|
| 3003 | O | 6–200 | 0.5–20 | 1000–6000 | ASTM B483 / ASTM B210 |
| 3003 | H14 | 6–250 | 0.5–25 | 1000–6000 | ASTM B483 / ASTM B210 |
| 3003 | H16 | 8–200 | 1.0–20 | 1000–6000 | ASTM B483 / ASTM B210 |
| 3003 | H18 | 8–150 | 1.0–15 | 1000–6000 | ASTM B483 / ASTM B210 |
| 3003 | H22 | 6–200 | 0.5–20 | 1000–6000 | ASTM B483 / ASTM B210 |
For larger diameters (up to 300 mm OD) or heavier wall thicknesses, please contact our sales team with your specifications. Non-standard sizes typically require 20–40 days for production, while stocked dimensions ship within 7–15 days.
Standard dimensional tolerances conform to ASTM B483 (drawn seamless tube) or ASTM B210 (drawn tube), depending on the production route:
Tighter tolerances are available for precision applications. Please specify your tolerance requirements when requesting a quote.
3003 aluminum round tube is produced to recognized international standards. The table below provides cross-references for global procurement.
| Standard / Region | Désignation |
|---|---|
| ASTM (USA) | 3003 (ASTM B483 / B210) |
| EN (Europe) | EN AW-3003 / EN AW-Al Mn1Cu |
| GB/T (China) | 3003 (GB/T 4436 / GB/T 3191) |
| JIS (Japon) | A3003 |
| ISO | AlMn1Cu |
Linsy 3003 round tubes are produced in compliance with ASTM B483 / ASTM B210 and EN 755 as applicable. If your project requires a specific national standard or additional testing requirements, please specify these when requesting a quote so we can confirm compliance and documentation.
The chemical composition of 3003 aluminum alloy conforms to ASTM B483 and EN 573-3 requirements. The table below lists the nominal limits for each element.
| Élément | Contenu (%) |
|---|---|
| Silicium (Si) | 0.6 max |
| Fer (Fe) | 0,7 max |
| Cuivre (Cu) | 0.05–0.20 |
| Manganèse (Mn) | 1.0–1.5 |
| Zinc (Zn) | 0,10 max |
| D'autres, chacun | 0,05 max |
| Autres, total | 0,15 max |
| Aluminium (Al) | Équilibre |
Manganese (1.0–1.5%) is the defining alloying element, providing the strength advantage over 1100 aluminum. The copper content (0.05–0.20%) contributes a modest additional strengthening effect. Iron and silicon are present as controlled impurities. Magnesium, chromium, and titanium are not intentionally added to 3003 and are captured within the “Others” limits. Every heat is verified against these composition limits and documented in the MTC supplied with your order.
The mechanical properties of 3003 aluminum round tube depend on the temper condition. As a non-heat-treatable alloy, properties are developed through cold working (strain hardening). The O temper provides maximum ductility for bending and flaring operations, while higher tempers offer progressively greater strength at the cost of formability. H22 (strain-hardened and partially annealed) provides similar strength to H14 but with improved ductility — a preferred choice when post-fabrication forming is required.
| Tempérer | Résistance à la traction (MPa) | Limite d'élasticité (MPa) | Élongation (%) | Dureté (HB) |
|---|---|---|---|---|
| O | 95–130 | 35 min | 23–30 | 28 |
| H12 | 120–155 | 85 min | 10–20 | 35 |
| H14 | 140–180 | 115 min | 8–16 | 40 |
| H16 | 165–205 | 145 min | 5–14 | 47 |
| H18 | 185 min | 165 min | 4–10 | 55 |
| H22 | 120–155 | 85 min | 10–20 | 35 |
Values shown are typical per ASTM B483 / ASTM B210. Actual values may vary with tube dimensions and production route (seamless vs. welded-drawn). Contact our team for guaranteed mechanical properties against your specific OD/wall thickness combination.
Choosing the right temper depends on what happens to the tube after you receive it. Will it be bent, flared, welded, or used as-is? The guide below helps match temper to your downstream process:
| Tempérer | État | Meilleur pour |
|---|---|---|
| O | Fully annealed, softest | Severe bending, flaring, beading, and end-forming operations. Ideal for tube assemblies that will undergo significant deformation during fabrication. Best choice for expansion-fit heat exchanger tubes. |
| H14 | Strain-hardened, half-hard | General-purpose structural and fluid tubing. Good balance of strength and moderate formability. The most commonly stocked temper for 3003 round tubes. Suitable for simple bends and light end-forming. |
| H16 | Strain-hardened, 3/4-hard | Improved stiffness for longer unsupported spans. Reduced formability — avoid tight-radius bends in this temper. Good for straight-run fluid lines and structural tube sections. |
| H18 | Strain-hardened, full-hard | Maximum strength available in 3003 tubing. Best machinability. Not recommended for bending or forming. Use for straight tube sections where high stiffness-to-weight ratio is the priority. |
| H22 | Strain-hardened & partially annealed | Nearly the same strength as H14 but with significantly better ductility. The go-to temper when tubes must be bent or flared after cutting to length. Preferred for hydraulic and pneumatic line applications. |
If your application involves post-receipt bending, strongly consider O or H22. For straight-run tubes that will not be formed, H14 offers the best cost-performance balance.
3003 round tubes resist atmospheric corrosion, mild chemical exposure, and moisture without requiring protective coatings. This makes them a reliable choice for exposed fluid lines, outdoor structural tubing, and equipment used in food processing or chemical environments. The natural aluminum oxide layer provides inherent protection, and the alloy is compatible with decorative anodizing for applications where appearance matters alongside corrosion performance.
In the O and H22 tempers, 3003 tubes can be cold-bent, flared, swaged, and end-formed without cracking. This is especially important for heat exchanger tube assemblies and hydraulic line fabrication, where tube ends must be expanded or beaded to form leak-tight mechanical joints. Even in H14 temper, moderate-radius bends are achievable with proper tooling.
3003 aluminum tube welds reliably with TIG (GTAW) and MIG (GMAW) processes. Recommended filler metals are 1100 or 4043. Unlike heat-treatable alloys, 3003 requires no post-weld heat treatment, and the heat-affected zone retains good corrosion resistance. Welded-drawn production routes are common for 3003 tubing, producing tube with properties comparable to seamless product for most applications.
With roughly 20% higher strength than 1100 aluminum tubing, 3003 provides a meaningful step up in load-bearing and pressure-containing capability without the cost premium of 5xxx or 6xxx series alloys. For general-purpose fluid and structural tubing applications where 6061-T6 strength levels are unnecessary, 3003 offers the most economical choice.
3003 cannot be strengthened by heat treatment. All mechanical properties come from cold working during tube drawing. This means 3003 tubes will soften if exposed to sustained temperatures above approximately 340°C (645°F), such as during brazing or certain coating cure cycles. If elevated-temperature strength retention is required, consider 5052-O or 6061-T6 tube instead.
The combination of corrosion resistance, formability, and moderate strength makes 3003 round tube a versatile material across numerous industries. Typical applications include:
3003 round tube in H14 to H18 tempers machines with fair to good chip control. The cold-worked tempers produce a cleaner surface finish and shorter chips than the annealed O temper. Use carbide tooling with positive rake geometry and adequate coolant flow. For production turning and facing operations on tube ends, chip evacuation is important — consider pecking cycles for deep boring operations. Tube cutting to length is typically done with circular saws; deburring and chamfering are recommended as standard post-cut steps.
Cold tube bending in O and H22 tempers achieves centerline bend radii as tight as 1.5× OD without cracking or significant wall thinning. For H14 temper, a minimum bend radius of 2.5× OD is recommended. Mandrel bending is preferred for thin-wall tube (wall thickness below 10% of OD) to prevent buckling on the inside radius. For tight-radius bends in H14 material, consider localized annealing or specify H22 temper as a production-ready alternative.
3003 round tube is readily weldable by TIG and MIG processes. Filler metals 1100 and 4043 are both compatible; 4043 provides better fluidity and reduced hot-cracking risk. For butt-welding tube joints, ensure square-cut, deburred ends and good fit-up. The heat-affected zone will revert to the annealed (O) condition, so welded assemblies should be designed for the as-welded strength level. Tube-to-tube-sheet welding (as in heat exchanger fabrication) is routine with 3003.
3003 round tubes are supplied with a mill finish as standard. Additional surface treatments available:
Every shipment of 3003 aluminum round tube from Linsy includes a Certificat d'essai en usine (MTC) documenting the heat number, chemical composition, mechanical properties, and dimensional check results for your specific lot. Our quality management system is certified to ISO 9001, ensuring full traceability from billet to finished tube.
Additional quality services available:
Linsy Aluminum is a Shenzhen-based aluminum factory with over 20 years of experience supplying aluminum products to customers across 20+ countries. Our 3003 round tube program combines reliable production, flexible service, and competitive lead times:
For further technical information about 3003 aluminum alloy and comparisons with other grades, explore the following articles from the Linsy Knowledge Hub:
Q: What is the difference between 3003-H14 and 3003-H22 round tube?
A: Both tempers deliver similar strength levels, but they reach that strength through different processing paths. H14 is strain-hardened only (half-hard), while H22 is strain-hardened and then partially annealed. The partial anneal in H22 improves ductility, making it the better choice when tubes must be bent, flared, or end-formed after cutting to length. H14 is more commonly stocked and suitable for straight-run tube applications or simple bends.
Q: Can 3003 aluminum round tube be used for pressure applications?
A: Yes, 3003 tube is suitable for low to medium-pressure fluid service. The allowable working pressure depends on tube diameter, wall thickness, temper, service temperature, and the applicable design code. For pressure-containing applications, we recommend specifying hydrostatic testing as part of your order and providing your design pressure and safety factor requirements so we can confirm the suitable tube dimensions.
Q: What tube tolerances are standard?
A: Standard tolerances per ASTM B483 or ASTM B210 apply. Typical OD tolerances range from ±0.08 mm (small diameters) to ±0.5% of nominal OD (larger diameters). Wall thickness tolerance is typically ±10% of nominal. Tighter tolerances are available on request for precision applications — please specify your requirements when ordering.
Q: Is 3003 round tube suitable for brazing?
A: 3003 can be brazed, but brazing temperatures (typically 570–620°C) will anneal the tube, reducing strength to the O temper level. If post-braze strength is critical, consider using a thicker wall to compensate, or evaluate 6061-T6 tube with appropriate post-braze heat treatment. For HVAC and heat exchanger brazed assemblies, 3003 is commonly used and performs reliably when the as-brazed strength is accounted for in the design.
Q: Can 3003 round tubes be anodized?
A: Yes, but the manganese in 3003 can give anodized surfaces a slightly grayish or darker cast compared to 6063-anodized surfaces. Decorative anodizing is feasible but may not achieve a bright, highly uniform finish. For functional anodizing (corrosion protection only), 3003 performs well. If a bright decorative anodized finish is essential, 6063-T5 tube is the better choice.
Q: What is your minimum order quantity (MOQ) for 3003 round tubes?
A: MOQ varies by OD, wall thickness, and temper. For standard stock sizes, we accommodate small quantities for prototyping and sampling. Contact our sales team with your specifications for a specific MOQ confirmation.
Q: How long does delivery take?
A: Stock sizes in common tempers typically ship within 7–15 days. Custom OD/wall thickness combinations or non-stock tempers require 20–40 days. Large production orders may extend to 60 days depending on mill schedule. We provide a confirmed delivery schedule with every quotation.
Q: Do you ship internationally?
A: Yes. We ship to customers across North America, Europe, Southeast Asia, the Middle East, and Australia. We provide complete export documentation including commercial invoices, packing lists, certificates of origin, and any destination-specific paperwork. Sea freight and air freight options are both available.
Q: What documentation comes with the order?
A: Every order includes a Mill Test Certificate (MTC) documenting chemical composition and mechanical properties. Additional documents such as third-party test reports (SGS, TÜV), dimensional inspection reports, hydrostatic test certificates, or certificates of origin are available on request.
Q: Can you provide machined, bent, or fabricated tube assemblies?
A: Yes. Our in-house capabilities include tube cutting, end-forming (flaring, beading, swaging), CNC machining (drilling, tapping, slotting), bending, and welding. We can deliver 3003 round tubes as ready-to-install assemblies per your drawing, reducing your in-house fabrication time and procurement complexity.
Avantages pour Linsy
Linsy Aluminum est un fournisseur de premier plan de produits de transformation de l'aluminium, au service de diverses industries, notamment l'aérospatiale, l'ingénierie générale, l'automobile, la marine, la construction navale et d'autres applications industrielles spécialisées.
Nous nous engageons à respecter les normes les plus strictes en matière de qualité et de responsabilité environnementale, comme en témoignent nos certifications : ISO 9001:2008， ISO 14001:2004 et SGS.
