4045 aluminum alloy (UNS A94045, EN AW-AlSi10) is a 4000-series wrought aluminum alloy alloyed primarily with silicon (9–11%). Its high silicon content gives excellent fluidity and low solidification shrinkage, making it a preferred filler and cladding alloy for brazing and welding applications. Linsy supplies 4045 aluminum in brazing sheet, coil, filler wire, foil, and bar in tempers O and F, with custom sizes, surface finishing, and MTC reports available.
Verfügbare Formulare: brazing sheet / coil / filler wire / foil / bar
Häufige Temperamente: O / F
Unterstützung bei der Bearbeitung: CNC machining / laser cutting / slitting / surface finishing
Qualitätsdokumente: MTC-Bericht bei jeder Bestellung, SGS-Prüfung auf Anfrage
4045 aluminum alloy (UNS A94045, EN AW-4045 / AlSi10) is a heat-treatable wrought aluminum alloy in the 4000 series, primarily alloyed with silicon at 9–11%. The high silicon content lowers the melting range and provides excellent fluidity during brazing, while reducing solidification shrinkage — properties that make 4045 one of the most widely used aluminum brazing and filler alloys.
Unlike structural alloys such as 6061 or 7075, 4045 is not designed for load-bearing applications. Its value lies in its metallurgical behavior as a filler: it flows cleanly into joints, wets aluminum substrates well, and produces sound brazed assemblies with minimal cracking. 4045 is commonly supplied as brazing sheet (often as a cladding layer on 3003, 3005, or 6951 core alloys), as filler wire for gas welding and brazing, and as foil for heat-exchanger fabrication.
4045 is covered under major international standards including ASTM B209 (sheet and plate), ASTM B211 (bar, rod, and wire), ISO 6361, and EN 573-3. Its European designation is EN AW-4045 / AlSi10(A).
Linsy supplies 4045 aluminum in standard and custom product forms tailored to brazing, welding, and heat-exchanger applications. Dimensions and tolerances can be customized to your project requirements.
| Formular | Temperament | Dicke (mm) | Breite (mm) | Länge (mm) |
|---|---|---|---|---|
| 4045 Brazing Sheet / Coil | F, O | 0.1 – 4.0 | 500 – 1600 | 500 – 6000 |
4045 brazing sheet is frequently supplied as clad composite (4045 clad on a 3xxx or 6xxx-series core) for heat-exchanger fabrication. Both single-sided and double-sided clad constructions can be quoted on request.
| Parameter | Spezifikation |
|---|---|
| Durchmesser | 0.8 – 5.0 mm |
| Temperament | F, O |
| Gewicht der Spule | Min 20 kg |
| Größentoleranz | ± 0.03 mm |
| Oberfläche | Clean, dry, spooled or straightened |
4045 filler wire is used for brazing and gas welding of aluminum assemblies where good flow and joint fill are required. It is an alternative to 4047 (higher silicon, lower melting range) when a slightly broader melting interval is acceptable.
| Formular | Temperament | Dicke (mm) | Breite (mm) |
|---|---|---|---|
| 4045 Foil | O | 0.05 – 0.3 | 50 – 1200 |
| Formular | Temperament | Durchmesser (mm) | Länge (mm) |
|---|---|---|---|
| 4045 Round Bar | F, O | 3 – 100 | 1000 – 6000 |
4045 bar is less common than sheet or wire but is available for applications requiring machining stock or brazing preforms. Contact Linsy to confirm availability for your required size range.
4045 tube and custom profiles can be quoted on request for specialized brazing assemblies or preform applications. Because 4045 is primarily a filler and cladding alloy, tube availability is limited compared to structural grades. Please share your drawing or specification for a feasibility review.
| Standardsystem | Bezeichnung |
|---|---|
| UNS | A94045 |
| EN AW | EN AW-4045 / AlSi10(A) |
| ISO | Al Si10 |
| AA / SAE | 4045 |
| JIS (Japan) | A4045 |
| GB / Chinesisch | 4045 |
Allgemein geltende Normen:
Composition limits per ASTM / EN standards (weight %):
| Element | Min % | Max % |
|---|---|---|
| Silizium (Si) | 9.0 | 11.0 |
| Eisen (Fe) | — | 0.8 |
| Kupfer (Cu) | — | 0.30 |
| Mangan (Mn) | — | 0.30 |
| Magnesium (Mg) | — | 0.30 |
| Zink (Zn) | — | 0.20 |
| Titan (Ti) | — | 0.20 |
| Andere, jeweils | — | 0.05 |
| Sonstige, insgesamt | — | 0.15 |
| Aluminium (Al) | Remainder (≈ 87.0 – 89.5) | |
The high silicon content is the defining feature of 4045. Silicon lowers the melting range to approximately 577–632 °C (1071–1170 °F), enabling 4045 to melt and flow before the core alloy in brazed assemblies — this is why it is widely used as a cladding and filler material.
4045 is a filler and brazing alloy, not a structural grade. Mechanical properties are modest and are rarely the primary selection criterion. Typical values for 4045 in the annealed (O) condition are shown below.
| Eigentum | Typical Value (O temper) |
|---|---|
| Zugfestigkeit (Ultimate) | ≈ 124 MPa (≈ 18 ksi) |
| Streckgrenze (0,2%) | ≈ 60–80 MPa (approximate) |
| Dehnung beim Bruch | ≈ 15 % |
| Härte (Brinell) | ≈ 40–50 HB (approximate) |
| Dichte | 2.67 g/cm³ (0.096 lb/in³) |
| Schmelzbereich | 577 – 632 °C (1071 – 1170 °F) |
| Elastizitätsmodul | ≈ 70 GPa (10,150 ksi) |
Values shown are typical for annealed 4045. Yield strength and hardness are indicative — 4045 is not typically specified for structural load-bearing use. For applications where mechanical performance is critical, consider 6061, 5052, or other structural alloys.
4045 is supplied in a limited number of tempers because it is a filler alloy, not a structural grade that benefits from precipitation hardening.
| Temperament | Am besten für | Anmerkungen |
|---|---|---|
| 4045-O (Annealed) | Brazing sheet, foil, filler wire requiring maximum ductility | Softest condition. Best formability and braze flow. Most common temper for 4045 products. |
| 4045-F (As-Fabricated) | Bar, rod, and wire where no final anneal is specified | Properties depend on production method. Used when annealed condition is not required. |
Unlike 2xxx, 6xxx, or 7xxx alloys, 4045 does not use T-type tempers (T4, T6, etc.) because it is not strengthened by precipitation hardening in service. Its metallurgical role is to melt and flow during brazing, not to carry structural load.
The 9–11% silicon content gives 4045 a low and narrow melting range (577–632 °C). This allows it to melt and flow cleanly into joint clearances during brazing, wetting aluminum substrates without excessive erosion. 4045 is one of the standard filler alloys for aluminum brazing in heat-exchanger manufacturing.
High silicon content reduces solidification shrinkage compared to pure aluminum. This helps minimize shrinkage cracking and porosity in brazed joints, producing sounder assemblies — particularly important in long brazed seams and complex heat-exchanger cores.
The silicon addition improves melt fluidity, allowing 4045 to fill tight joint gaps and complex braze joints. This same property makes it suitable for casting and foundry applications where thin sections or intricate geometry are involved.
4045 offers acceptable corrosion resistance in typical brazed-assembly service environments. However, because it is often used as a cladding or filler rather than as the exposed surface, corrosion performance of the finished assembly usually depends on the core alloy (e.g., 3003 or 6951) more than on the 4045 layer itself.
4045 is a low-to-moderate strength alloy. Its tensile strength in the annealed condition is approximately 124 MPa — far below structural grades like 6061-T6 (≈ 310 MPa) or 7075-T6 (≈ 572 MPa). It should not be specified for load-bearing applications. Its selection is driven by braze/filler performance, not by mechanical strength.
4045 is selected wherever aluminum brazing, welding filler, or cladding performance is required:
4045 requires a different processing mindset than structural alloys. Its primary function is to melt and flow during brazing — handling and fabrication should preserve surface cleanliness and dimensional accuracy.
Quality control at Linsy runs from raw material selection through finished product inspection. Every order is supplied with an MTC (Material Test Certificate) issued under Linsy Aluminum after production, including chemical composition results for the actual lot.
Für Kunden, die eine Überprüfung durch einen unabhängigen Dritten benötigen, sind SGS-Prüfberichte auf Anfrage gegen eine zusätzliche Prüfgebühr erhältlich. Zu den verfügbaren SGS-Berichten gehören:
Linsy Aluminum is a Shenzhen-based aluminum factory with more than 20 years of industry experience, supplying 4045 and other 1000–8000 series alloys to customers across automotive thermal management, HVAC, general engineering, manufacturing, and power electronics.
For your 4045 sourcing, this means:
4045 is a specialty brazing and filler alloy. Dedicated 4045 application guides will be linked here as they are published. In the meantime, these related resources may help with alloy selection:
4045 is primarily used as a brazing filler and cladding alloy. Its main applications are brazed aluminum heat exchangers (radiators, condensers, evaporators), filler wire for gas welding and brazing, and clad sheet for furnace-brazed assemblies. It is not a structural load-bearing alloy.
Both are 4xxx-series aluminum-silicon filler alloys. 4045 contains 9–11% silicon; 4047 contains 11–13% silicon. The higher silicon in 4047 gives a slightly lower and narrower melting range, which can improve braze flow in tight joints. 4045 is often used where a slightly broader melting interval is acceptable.
4043 contains 4.5–6.0% silicon, while 4045 contains 9–11% silicon. 4043 is a general-purpose welding filler wire with moderate silicon content. 4045 has higher silicon, giving better fluidity and lower melting range — making it more suitable for brazing applications. 4043 is more commonly used for general gas welding and GTAW filler applications.
4045 is classified as a heat-treatable alloy in some reference standards, but it is not strengthened by precipitation hardening in practical service. It does not use T4, T6, or other T-type tempers. Its metallurgical role is to melt and flow during brazing, not to provide strength through heat treatment.
No. 4045 has low-to-moderate strength (tensile strength ≈ 124 MPa in the annealed condition). It is a filler and brazing alloy, not a structural grade. For load-bearing applications, consider 6061, 6063, 5052, or 7075 depending on your strength, weldability, and corrosion requirements.
4045 brazing sheet is aluminum sheet (often thin gauge, 0.1–4.0 mm) used in brazed heat-exchanger manufacturing. It is frequently supplied as a clad composite — 4045 clad on one or both sides of a 3003, 3005, or 6951 core alloy. During furnace brazing, the 4045 cladding melts and forms the braze joint while the higher-melting core retains its shape.
Linsy supplies 4045 as brazing sheet and coil, filler wire, foil, and bar. Tube and custom profiles can be quoted on request. Because 4045 is a specialty filler alloy, availability of some forms is more limited than for structural grades like 6061.
The melting range of 4045 is approximately 577–632 °C (1071–1170 °F). The silicon addition lowers the melting point below that of pure aluminum (660 °C), which is why 4045 melts and flows before the core alloy in brazed assemblies.
For non-stock sizes or custom specifications, typical lead time is 10–60 days depending on alloy, dimensions, processing requirements, and order complexity. In-stock standard specifications can ship faster — contact our team for a specific quote.
Linsy supports low-MOQ custom production for non-stock 4045 items. MOQ varies by form, size, and processing scope; please share your requirements and we will confirm feasibility.
Every order ships with an MTC (Material Test Certificate) issued by Linsy Aluminum after production. Optional SGS third-party test reports are available on request at an additional testing cost.
Yes, samples can be arranged for most standard and custom specifications. Sample cost and lead time depend on size and processing requirements.
Linsy versendet weltweit und verfügt über ein etabliertes Liefernetz in Europa, Südafrika, Brasilien, Singapur, der Türkei, Japan, Südkorea und Südasien.
Linsy Vorteile
Linsy Aluminum ist ein führender Anbieter von Produkten für die Aluminiumverarbeitung und beliefert verschiedene Branchen wie die Luft- und Raumfahrt, den allgemeinen Maschinenbau, die Automobilindustrie, die Schifffahrt, den Schiffbau und andere spezialisierte industrielle Anwendungen.
Wir verpflichten uns, die höchsten Qualitäts- und Umweltstandards einzuhalten, was durch unsere Zertifizierungen belegt wird: ISO 9001:2008, ISO 14001:2004 und SGS.
