4000 Series Aluminum Alloy

The 4000 series aluminum alloy is a material made of aluminum and silicon. It is a medium-strength aluminum alloy that is highly resistant to corrosion and has good strength. It is appropriate for applications that require both high strength and high resistance to corrosion.

By adding silicon to aluminum alloy in the 4000 series, you can improve its resistance to corrosion, allowing it to perform better in environments with high temperatures and humidity. This, in turn, enhances the weldability of the alloy material, which is essential for applications that require welding.

As a result, aluminum alloys in the 4000 series aluminum are popularly utilized as welding wires and welding layer materials in the automotive industry. Some of the common types of alloys include 4043, 4045, and 4343.

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Main Alloy Chemistry Typical

4043 Aluminum Alloy

Element	Si	Fe	Cu	Mn	Mg	Zn	Ti	Cr	Others	Al
Maximum Content	4.5 - 6.0	0.8	0.3	0.05	0.05	0.1	0.2	0.1	≤0.05 (each), ≤0.15 (total)	remain

4045 Aluminum Alloy

Element	Si	Fe	Cu	Mn	Mg	Zn	Ti	Cr	Others	Al
Maximum Content	9.0 - 11.0	0.8	0.3	0.05	0.05	0.1	0.2	0.1	≤0.05 (each), ≤0.15 (total)	remain

4343 Aluminum Alloy

Element	Si	Fe	Cu	Mn	Mg	Zn	Ti	Cr	Others	Al
Maximum Content	6.8 - 8.2	0.8	0.1	0.05	0.05	0.1	0.2	0.1	≤0.05 (each), ≤0.15 (total)	remain

The above alloy element ratio is based on the national standard. If you have special chemical composition requirements for 4000 series aluminum alloys, please contact our product specialist.

Physical Properties

Alloy Type	Density (g/cm³)	Coefficient of Thermal Expansion (10^-6/K)	Thermal Conductivity (W/(m·K))	Electrical Conductivity (% IACS)	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HB)
4043	2.68	23.6	120	40	190	80	12	65
4045	2.76	22.4	138	41	240	160	12	-
4343	2.66	21.3	115	40	150	90	10	60

Product Types

The 4000 series aluminum alloy has significant performance advantages compared to other alloys. It is commonly used as a brazing intermediate layer material for welding plates and belts through casting, extrusion into welding wire, or casting and rolling.

The 4000 series aluminum rod has a low melting point, which makes it an excellent material for forging mechanical parts.

The 4000 series aluminum alloy welding wire has several advantages, including its low melting point, good fluidity, high strength, and excellent corrosion resistance. Because of these advantages, it is widely used in the aerospace, automotive, and construction industries.

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Aluminum Brazing Sheet

4043, 4045, and 4343 are used as intermediate brazing layer materials for composite aluminum sheets, mainly for aluminum strip materials in heat exchangers.