3003 aluminum round bar is a widely used Al-Mn alloy product offering an excellent balance of corrosion resistance, formability, and moderate strength at a competitive cost. As a non-heat-treatable grade, 3003 derives its mechanical properties from cold working, with O (annealed), H14 (half-hard), and H22 (strain-hardened and partially annealed) being the most commonly specified tempers for round bar applications. Linsy supplies 3003 round bars in diameters from 3 mm to 300 mm with custom lengths available to project specifications. Every order ships with a full Mill Test Certificate (MTC), and third-party SGS test reports are available upon request. Whether you need small quantities for prototyping or bulk production volumes, our factory in Shenzhen supports flexible order sizes and provides CNC machining, cutting, and surface finishing services to reduce your downstream processing time.
Formularios disponibles: round bar (diameter 3–300 mm)
Temperamentos habituales: O / H14 / H22
Asistencia técnica: CNC machining / cutting to length / polishing / anodizing
Documentos de calidad: Informe MTC con cada pedido
Aluminio 3003 is a non-heat-treatable Al-Mn wrought alloy containing 1.0–1.5% manganese as its principal alloying element. Developed as an enhanced-strength alternative to commercially pure 1100 aluminum, 3003 offers roughly 20% higher strength while retaining excellent corrosion resistance and workability. It is one of the most widely used aluminum alloys globally due to its combination of moderate mechanical properties, outstanding formability, and attractive cost profile. Because 3003 cannot be strengthened by heat treatment, its mechanical properties are controlled through cold working (strain hardening), producing tempers such as H14 (half-hard) and H18 (full-hard). In the fully annealed O condition, 3003 exhibits maximum ductility for deep drawing and complex forming operations. The alloy also offers very good weldability across all common methods, making it a first-choice material for fabricated tanks, chemical equipment, and general sheet metal work. When formed into round bars, 3003 serves as a dependable, economical choice for shafts, fasteners, and general-purpose machined components in non-structural roles.
Linsy stocks and supplies 3003 aluminum round bars in multiple tempers and a practical range of diameters. Whether you need annealed material for severe forming or cold-worked stock for improved machinability and stiffness, we can match your production requirements.
| Aleación | Temple | Diámetro (mm) | Longitud (mm) | Estándar |
|---|---|---|---|---|
| 3003 | O | 3–300 | 1000–6000 | ASTM B221 |
| 3003 | H14 | 3–300 | 1000–6000 | ASTM B221 |
| 3003 | H16 | 5–200 | 1000–6000 | ASTM B221 |
| 3003 | H18 | 5–150 | 1000–6000 | ASTM B221 |
| 3003 | H22 | 5–250 | 1000–6000 | ASTM B221 |
Custom diameters, tighter tolerances, and specific cut lengths are available on request. Typical lead time for standard sizes is 7–15 days; non-standard dimensions run 20–40 days depending on quantity and mill schedule. For high-volume requirements beyond the standard range, please contact our sales team with your specifications.
3003 aluminum round bar is produced to recognized international standards. The table below lists commonly applied specifications and cross-references for global procurement.
| Standard / Region | Denominación |
|---|---|
| ASTM (USA) | 3003 (ASTM B221) |
| EN (Europa) | EN AW-3003 / EN AW-Al Mn1Cu |
| GB/T (China) | 3003 (GB/T 3191) |
| JIS (Japón) | A3003 |
| ISO | AlMn1Cu |
Our 3003 round bars are produced in compliance with ASTM B221, GB/T 3191, and EN 755 specifications as required by your project. If your application calls for a specific national standard, please specify it when requesting a quote so we can confirm compliance and provide the appropriate documentation.
The chemical composition of 3003 aluminum alloy conforms to ASTM B221 and EN 573-3 requirements. The table below lists the nominal composition limits for each element.
| Elemento | Contenido (%) |
|---|---|
| Silicio (Si) | 0.6 max |
| Hierro (Fe) | 0,7 máx. |
| Cobre (Cu) | 0.05–0.20 |
| Manganeso (Mn) | 1.0–1.5 |
| Zinc (Zn) | 0,10 máx. |
| Otros, cada uno | 0,05 máx. |
| Otros, total | 0,15 máx. |
| Aluminio (Al) | Saldo |
Manganese is the primary alloying element in 3003, responsible for the alloy’s higher strength compared to 1100 while maintaining excellent corrosion resistance. The copper content range of 0.05–0.20% provides a small additional strengthening effect. Iron and silicon are present as controlled impurities; their upper limits help ensure consistent forming behavior across production batches. Every heat is verified against these composition limits and the results are documented in the MTC supplied with your order.
The mechanical properties of 3003 aluminum round bar vary significantly with temper condition. Since 3003 is a non-heat-treatable alloy, properties are developed through strain hardening during cold working. The O temper provides maximum ductility for forming operations, while H1x tempers (strain-hardened only) and H2x tempers (strain-hardened and partially annealed) offer progressively higher strength at the expense of elongation.
| Temple | Resistencia a la tracción (MPa) | Límite elástico (MPa) | Alargamiento (%) | Dureza (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 mín. | 5–14 | 47 |
| H18 | 185 min | 165 min | 4–10 | 55 |
| H22 | 120–155 | 85 min | 10–20 | 35 |
Values shown are typical for 3003 round bar per ASTM B221. Minimum values apply to specified diameter ranges; exact values may vary by cross-section size. Contact our team for guaranteed mechanical properties against your specific diameter requirement.
Choosing the right temper for 3003 aluminum round bar depends on whether your subsequent process involves forming, machining, welding, or a combination of operations. Below is a practical guide to help you select the most suitable temper for your application.
| Temple | Condición | Lo mejor para |
|---|---|---|
| O | Fully annealed, softest | Deep drawing, severe bending, spinning, cold heading; maximum formability with lowest strength. Ideal for parts that will undergo significant deformation before final use. |
| H14 | Endurecido por deformación, semiduro | General-purpose machining, moderate forming, shafts and spindles that need a balance of machinability and some ductility. The most commonly stocked temper for round bars. |
| H16 | Strain-hardened, 3/4-hard | Improved machinability with reduced ductility. Suitable for parts that will not undergo further forming but benefit from a better surface finish during machining. |
| H18 | Strain-hardened, full-hard | Maximum strength and best machinability in the non-heat-treatable 3003 series. Used for fasteners, bushings, and components where stiffness is prioritized over formability. |
| H22 | Strain-hardened & partially annealed | Similar strength to H14 but with improved ductility. Preferred when the part requires moderate forming after machining or when better bendability is needed without a full anneal. |
If you are unsure which temper fits your process, our technical team can recommend the best option based on your drawing or machining sequence. H14 is typically the default choice for general machining from 3003 round bar stock.
3003 aluminum offers outstanding resistance to atmospheric corrosion and performs well in contact with many chemical agents. It does not require protective coatings for most indoor and moderate outdoor environments, making it a popular material for chemical processing equipment, food handling machinery, and marine-atmosphere components. The alloy’s natural oxide layer provides inherent protection, and it is compatible with decorative anodizing when a colored or hardened surface is desired.
In the O temper, 3003 exhibits excellent ductility suitable for deep drawing, spinning, and cold heading operations. Even in the H14 and H22 tempers, the alloy retains sufficient formability for moderate bending and stamping. This combination of formability and strength makes 3003 round bar a reliable starting stock for parts that will be cold-formed into finished components.
3003 is readily weldable by all common methods including gas tungsten arc (GTAW/TIG), gas metal arc (GMAW/MIG), and resistance welding. The recommended filler metals are 1100 or 4043 for general applications. Unlike heat-treatable 2xxx and 7xxx series alloys, 3003 does not require post-weld heat treatment, and the heat-affected zone retains good corrosion resistance. For welded assemblies made from 3003 round bar components, design for the reduced strength in the as-welded condition.
With approximately 20% higher strength than 1100 aluminum, 3003 offers a meaningful improvement in load-bearing capacity while maintaining a competitive price point. It is one of the most economical aluminum alloys available, thanks to high production volumes across the global supply chain. For applications where 6061 strength levels are unnecessary but 1100 is insufficient, 3003 provides the most cost-effective middle ground.
As a non-heat-treatable alloy, 3003 does not respond to solution heat treatment or precipitation hardening. All mechanical properties are developed through cold working. This has practical implications: 3003 round bars will soften if exposed to elevated temperatures (above approximately 340°C / 645°F) during welding or processing. For applications requiring high-temperature strength retention, consider 5052 or 6061 instead.
3003 aluminum round bar serves a wide range of general-purpose and industrial applications where moderate strength, corrosion resistance, and economical pricing are the primary requirements. Typical uses include:
3003 aluminum has fair to good machinability. The cold-worked H14 to H18 tempers machine noticeably better than the annealed O condition, producing a smoother surface finish and improved chip control. Compared to free-machining alloys like 2011 or 6262, 3003 generates longer, more continuous chips — so effective chip breaking and coolant delivery are recommended for production turning operations. Standard high-speed steel or carbide tooling works well; use generous rake angles and polished tool faces to minimize built-up edge on the cutting tool.
3003 round bar welds easily using TIG, MIG, and resistance methods. Filler metals 1100 and 4043 are both suitable; 4043 provides better weld fluidity and is preferred for general fabrication. Post-weld heat treatment is not required. The heat-affected zone will be in the annealed (O) condition, so if the assembly requires uniform strength, design accordingly or plan for post-weld cold working where feasible. 3003 does not suffer from stress corrosion cracking, which simplifies welding procedures compared to higher-strength 7xxx series alloys.
3003 round bars are typically supplied with a mill finish. Available surface treatments include:
Every shipment of 3003 aluminum round bar from Linsy includes a Certificado de ensayo de fábrica (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 traceability from raw material to finished product.
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 bar program is built on reliable mill partnerships, consistent quality, and flexible order fulfillment:
For deeper 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 bar?
A: Both tempers achieve similar strength levels, but H22 is strain-hardened and then partially annealed, which gives it better ductility and formability than H14 at comparable strength. H14 is strain-hardened only (half-hard) and is more commonly stocked. Choose H22 when your process involves post-machining bending or forming; choose H14 for general machining where formability is less critical.
Q: Can 3003 aluminum round bar be heat treated?
A: No. 3003 is a non-heat-treatable alloy. Its strength is developed through cold working (strain hardening). If your application requires heat-treatable properties, consider 6061 round bar instead. Note that 3003 will soften if exposed to sustained temperatures above approximately 340°C.
Q: What tolerances can I expect on 3003 round bar diameters?
A: Standard tolerances per ASTM B221 are typically h9 to h11 for cold-finished bars, depending on diameter. Tighter tolerances down to h8 are available on request. When ordering, specify your required tolerance class or provide your drawing with tolerance callouts so we can confirm feasibility and lead time.
Q: Is 3003 round bar suitable for marine environments?
A: Yes, 3003 offers good resistance to atmospheric marine corrosion and performs well in mild salt-spray conditions. It is commonly used for above-deck hardware, handrails, and non-structural marine fittings. For fully submerged or severe splash-zone applications, 5083 or 5086 are preferred for their superior seawater corrosion resistance.
Q: Can 3003 round bars be anodized?
A: Yes, but with caveats. Decorative anodizing in clear or colored finishes is feasible on 3003. However, the manganese content can produce a slightly grayish or darker tone compared to 6063-anodized surfaces. If consistent bright anodizing is critical, consider 6063-T5 round bar as an alternative. For functional non-decorative anodizing (corrosion protection only), 3003 works well.
Q: What is your minimum order quantity (MOQ) for 3003 round bars?
A: We support flexible MOQ depending on the specific diameter, temper, and whether the item is in current stock. For standard sizes, small quantities for sampling or prototyping are welcome. 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 diameters or non-stock tempers generally require 20–40 days, depending on mill availability and order volume. Large production orders may extend to 60 days. 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 handle export documentation including commercial invoices, packing lists, certificates of origin, and any destination-country-specific paperwork. Both sea freight and air freight options are available.
Q: What documentation comes with the order?
A: Every order ships with a Mill Test Certificate (MTC) documenting chemical composition and mechanical properties for your specific heat lot. Additional documents such as third-party SGS test reports, dimensional inspection reports, or certificates of origin are available on request at the time of order placement.
Q: Can you provide machined or finished 3003 round bar components?
A: Yes. Our in-house machining capability includes CNC turning, milling, drilling, and tapping. We can supply 3003 round bars cut to length, surface-finished (polished or anodized), or machined to your drawing specifications. This can reduce your total procurement cycle by delivering production-ready parts rather than raw stock.
Ventajas de Linsy
Linsy Aluminum es un proveedor líder de productos de procesamiento de aluminio, que presta servicio a diversas industrias, como la aeroespacial, la ingeniería general, la automoción, la marina, la construcción naval y otras aplicaciones industriales especializadas.
Nos comprometemos a mantener los más altos estándares de calidad y responsabilidad medioambiental, como demuestran nuestras certificaciones: ISO 9001:2008， ISO 14001:2004 y SGS.
