3103 aluminum alloy is a medium-strength Al-Mn wrought alloy in the 3xxx series, designated EN AW-3103 (AlMn1). Essentially the European counterpart to 3003, it offers good formability, excellent corrosion resistance, and moderate strength through cold working. Widely used in sheet metal fabrication, roofing, heat exchangers, and cooking utensils, 3103 is supplied by Linsy in sheet, coil, tube, bar, and profile forms — available in O, H12, H14, H16, and H18 tempers. We offer slitting, cut-to-length, and precision sawing with full Mill Test Certificates per EN 10204. Whether you need coil for radiator fin stock or sheet for architectural cladding, Linsy provides ISO 9001 certified material with flexible MOQs and 10–60 day lead times.
Moduli disponibili: sheet / coil / tube / bar / profile
Temperamenti comuni: O / H12 / H14 / H16 / H18
Supporto per l'elaborazione: cut-to-length / slitting / blanking / precision saw cutting
Documenti di qualità: MTC with each order per EN 10204
3103 is an aluminium-manganese wrought alloy designated EN AW-3103 (AlMn1) under European standard EN 573-3. It is the European counterpart to the more widely known 3003 alloy — sharing the same Al-Mn base, but with a slightly tighter copper limit (0.10% max) for improved corrosion performance in certain environments.
Belonging to the 3xxx series, 3103 is a non-heat-treatable, work-hardening alloy. Its mechanical properties are developed entirely through cold working (H tempers) rather than high-temperature thermal treatment. This makes temper selection the primary lever for adjusting strength and formability: O temper offers maximum ductility for deep drawing, while H14 and H16 provide structural strength for roofing, cladding, and formed components.
3103 matches 3003 in virtually all performance characteristics — corrosion resistance, density, thermal and electrical conductivity — making it the default specification in European markets where EN designation is required. It is widely used in corrugated roofing, heat exchangers, chemical equipment, kitchen utensils, and general sheet metal fabrication.
Sheet and coil are the dominant supply forms for 3103. Linsy stocks 3103 in O, H12, H14, H16, and H18 tempers, with cut-to-length, slitting, and blanking as standard processing options.
| Forma | Temperamento | Spessore (mm) | Larghezza (mm) | Lunghezza (mm) |
|---|---|---|---|---|
| 3103 Sheet | O, H12, H14, H16, H18 | 0.3 – 6.0 | 500 – 2600 | 1000 – 6000 |
| 3103 Coil | O, H12, H14, H16, H18 | 0.3 – 4.0 | 500 – 2600 | Coil (by weight) |
Custom thickness, width, and length available on request. Coil inner diameter: 508 mm standard.
3103 round tube is suitable for heat exchanger, fluid handling, and light structural applications. Supplied in O, H14, and H16 tempers.
| Forma | Temperamento | Diametro esterno (mm) | Spessore della parete (mm) | Lunghezza (mm) |
|---|---|---|---|---|
| 3103 Round Tube | O, H14, H16 | 6 – 200 | 0.5 – 20 | 1000 – 6000 |
Square and rectangular tube available as custom order. Contact us with your section drawing.
3103 round bar for machining, fasteners, and general mechanical components in moderate-strength applications.
| Forma | Temperamento | Diametro (mm) | Lunghezza (mm) |
|---|---|---|---|
| 3103 Round Bar | O, H14, H16 | 3 – 200 | 1000 – 6000 |
Square and flat bar available as custom order.
Custom profiles, formed sections, and fabricated parts available on inquiry. Contact our sales team with your drawing or specification for a feasibility assessment and quotation.
| Standard | Denominazione |
|---|---|
| EN / EN AW | EN AW-3103 / EN AW-AlMn1 |
| UNS | A93103 |
| ISO | AlMn1 |
| DIN (Germania) | AlMn1 |
| BS (UK) | 3103 (replaces former N3) |
| NF (France) | A-M1 |
| GB (Cina) | 3103 / 3003 (functionally equivalent) |
3103 is covered under IT 485 (sheet, strip and plate), EN 573-3 (chemical composition), EN 754 (cold drawn rod/bar and tube), and related product-form standards. For markets using AA / ASTM nomenclature, 3003 is the functional equivalent.
| Elemento | Composizione (%) |
|---|---|
| Silicio (Si) | 0,50 max |
| Ferro (Fe) | 0.70 max |
| Rame (Cu) | 0,10 max |
| Manganese (Mn) | 0.9 – 1.5 |
| Magnesio (Mg) | 0.30 max |
| Altri, ciascuno | ≤0.05 |
| Altri, totale | ≤0.15 |
| Alluminio (Al) | Equilibrio |
Composition per EN 573-3. The primary alloying element is manganese, which provides strength through solid-solution strengthening. The tighter copper limit (0.10% max vs. 3003’s 0.05–0.20%) gives 3103 marginally better corrosion resistance in specific environments. Trace elements chromium, zinc, and titanium are controlled within the “Others” limits above.
The mechanical properties of 3103 vary significantly with temper. The table below shows typical values per EN 485-2 for sheet at 1.2 mm thickness. Actual values may vary with product form, thickness, and processing history.
| Temperamento | Resistenza alla trazione (MPa) | Yield Strength (MPa, min) | Elongation (%, min) |
|---|---|---|---|
| O | 100 – 150 | ≥35 | ≥23 |
| H12 | 130 – 180 | ≥90 | ≥6 |
| H14 | 145 – 200 | ≥120 | ≥5 |
| H16 | 165 – 220 | ≥150 | ≥4 |
| H18 | ≥185 | ≥165 | ≥3 |
Values shown are typical for 1.2 mm sheet per EN 485-2. Thinner gauge material may show higher strength and lower elongation. H2x tempers (strain-hardened and partially annealed) offer intermediate strengths with improved ductility compared to H1x equivalents — contact us for availability.
| Temperamento | Strength Level | Formabilità | Applicazioni tipiche |
|---|---|---|---|
| O | Il più basso | Excellent — deep drawing, stretching | Deep drawn cookware, complex stampings, spun parts |
| H12 | Low – Medium | Good — moderate forming | General sheet metal, lightly formed panels, enclosures |
| H14 | Medio | Moderate — limited bending | Corrugated roofing, siding, truck panels, storage tanks |
| H16 | Medium – High | Limited — gentle bending only | High-strength cladding, stiffener panels, structural sheet |
| H18 | Il più alto | Minimal — flat applications | Fin stock, flat blanks, maximum stiffness requirements |
3103 offers excellent resistance to atmospheric corrosion, fresh water, and many mild chemical environments — comparable to 3003 and other 3xxx series alloys. The manganese content contributes to a uniform, protective surface oxide. The tighter copper limit (0.10% max vs. 3003) provides marginally better performance in certain mildly acidic or condensation-prone environments.
In the O temper, 3103 exhibits outstanding formability suitable for deep drawing, stretching, and bending. Work-hardened tempers (H1x) progressively reduce formability but can still be bent, roll-formed, and stamped with appropriate tooling and bend radii. Minimum bend radius for H14 temper is approximately 0.5–1× thickness for 90° bends.
3103 can be welded by gas welding, resistance welding, and brazing. TIG and MIG welding are feasible but may require filler alloys (e.g., 4043 or 4047) to reduce hot-cracking risk. Brazing and soldering work well with appropriate flux. Mechanical fastening (riveting, bolting) is reliable in all tempers. For welded structures requiring consistently sound fusion welds, consider 5xxx series alloys as an alternative.
Like other Al-Mn alloys, 3103 offers good thermal conductivity (approximately 160 W/m·K at room temperature) and moderate electrical conductivity (approximately 40% IACS in O temper). These properties, combined with formability and corrosion resistance, make it a popular choice for heat exchanger and radiator applications.
As a non-heat-treatable alloy, 3103 gains all its strength from cold working. The work-hardening rate is moderate — faster than pure aluminum (1xxx) but slower than 5xxx alloys. Annealing at 345°C followed by slow cooling restores full softness for reworking.
Cutting: 3103 sheet and plate can be sheared, slit, or saw-cut with standard aluminum tooling. Linsy provides cut-to-length and slitting services for sheet and coil. Precision saw cutting is available for bar and tube.
Formazione: For deep drawing and severe forming, specify O temper. For roll forming, press braking, and moderate bending, H14 or H16 are suitable. The work-hardening rate is moderate — multi-stage forming with intermediate annealing at 345°C is standard practice for complex geometries.
Annealing: Heat to 345°C, hold for sufficient time to ensure through-heating, and slow cool (furnace cool or still air). Avoid rapid quenching, which may cause distortion in thin sheet.
Surface finish: Mill finish is standard. 3103 can be chemically cleaned, etched, or conversion coated for improved paint adhesion. It is not recommended for decorative anodizing — the manganese content can produce a gray or mottled anodic coating. For anodized applications, consider 5xxx or 6xxx series alloys.
Every 3103 shipment from Linsy includes a Mill Test Certificate (MTC) per EN 10204 Type 3.1, documenting:
Additional testing available on request: intergranular corrosion testing, conductivity measurement, microstructural examination, and ultrasonic inspection for thicker sections.
Linsy Aluminum has served international industrial buyers for over 20 years, supplying aluminum alloys across building, automotive, packaging, and general engineering sectors. We understand that 3103 buyers need the right temper, precise gauge control, and reliable documentation for their production line — whether it is coil for radiator manufacturing or sheet for a roofing project.
Our quality management system is certified to ISO 9001, environmental management to ISO 14001, and occupational health and safety to ISO 45001. Material is sourced from ISO-certified mills with full lot traceability from cast to shipment.
We ship 3103 sheet, coil, tube, and bar to customers across Europe, Southeast Asia, the Middle East, South America, and Africa. Custom dimensions, flexible minimum order quantities, and 10–60 day lead times are standard. Contact us with your inquiry — our team responds with a quotation and technical data sheet within one business day.
Q: How does 3103 compare to 3003 aluminum?
A: 3103 and 3003 share the same Al-Mn base and deliver virtually identical mechanical properties, corrosion resistance, and formability. The key difference is chemical: 3103 limits copper to 0.10% max (per EN 573-3), while 3003 allows 0.05–0.20% Cu (per ASTM B209). 3103 is the European designation (EN AW-3103); 3003 is the American designation (AA 3003). Both are interchangeable in most applications.
Q: What is the 3103 equivalent in Chinese standards?
A: Under GB/T 3190, the alloy 3003 is the functional equivalent of 3103. Both are Al-Mn alloys with overlapping composition ranges. For Chinese-market projects specifying “3003,” 3103 material can generally be substituted with mutual agreement. Confirm with your end-user specification before substitution.
Q: Can 3103 aluminum be anodized?
A: 3103 is not a preferred anodizing alloy. The manganese content can produce a gray or mottled anodic coating rather than the clear, bright finish expected from 5xxx or 6xxx alloys. For decorative or architectural anodizing, consider 5005, 5052, or 6063.
Q: Is 3103 suitable for welding?
A: 3103 welds well with gas welding, resistance welding, and brazing. TIG and MIG welding are feasible but may require filler metal (e.g., 4043) to mitigate hot-cracking risk. For consistently welded structures, consider 5052 or 5083 as an alternative.
Q: What is the minimum order quantity?
A: Linsy operates with flexible MOQs. Standard stock sizes are available from single sheets; custom dimensions and non-stock tempers may require a production minimum. Contact us with your specification for a quotation within one business day.
Q: Do you provide Mill Test Certificates?
A: Yes. Every order includes an MTC per EN 10204 Type 3.1 with full chemical and mechanical results traceable to the heat number.
Q: What are your lead times?
A: Standard: 10–60 days, depending on product form, temper, quantity, and current production schedule. Stock items ship faster. Contact us for a confirmed delivery date with your quotation.
Q: Can you supply custom dimensions?
A: Yes. Custom thickness, width, length, and temper combinations are available on request. Non-standard sizes may require a production minimum but we accommodate most requirements.
Q: What certifications does Linsy hold?
A: Linsy is certified to ISO 9001 (quality management), ISO 14001 (environmental management), and ISO 45001 (occupational health and safety). We can provide copies of current certificates on request.
Q: How do I request a quotation?
A: Contact us through the inquiry form on this page or email our sales team directly. Provide your required alloy, temper, dimensions, quantity, and destination, and we will return a quotation with a technical data sheet within one business day.
Vantaggi Linsy
Linsy Aluminum è un fornitore leader di prodotti per la lavorazione dell'alluminio, che serve diversi settori, tra cui quello aerospaziale, dell'ingegneria generale, automobilistico, marittimo, navale e altre applicazioni industriali specializzate.
Ci impegniamo a mantenere i più alti standard di qualità e responsabilità ambientale, come dimostrano le nostre certificazioni: ISO 9001:2008, ISO 14001:2004 e SGS.
