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5754 and 7075 Aluminum Sheet for Automobile

5754 aluminum is an Al-Mg series rust-resistant aluminum alloy. Its core advantages lie in its excellent corrosion resistance, good weldability, and flexible formability, making it a perfect choice for automotive body panels and structural components. Unlike alloys that can be heat-treatable, the properties of 5754 are primarily adjusted through cold work hardening and annealing processes. Its main tempers include O, H22, H32, and H34.

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5754-O

After annealing at 380-420℃, 5754-O aluminum sheets exhibit excellent plasticity, with tensile strength between 190-230 MPa and elongation exceeding 22%. This "soft" characteristic makes it an ideal material for complex curved surface forming, especially suitable for components requiring deep drawing, such as automotive fuel tanks and door panels.

Taking automotive fuel tanks as an example, O-temper 5754 not only easily handles complex stamping processes, but its excellent corrosion resistance also effectively resists fuel erosion, avoiding the rust problems of traditional steel fuel tanks and extending the component's service life.

5454-H22 aluminum

5754-H22, also known as almg3 h22, is a lightly work-hardened state of 5754 aluminum alloy. It is typically produced through 15%-25% cold deformation followed by low-temperature stabilization annealing at 150-180℃. Its properties fall between the O and H32 tempers, with a tensile strength of approximately 210-250 MPa and an elongation of around 15%, offering both good formability and basic strength. These characteristics make it suitable for automotive interior trim and non-load-bearing exterior components, such as dashboard brackets, seat frame connectors, and window trim.

These parts do not need to withstand extreme stress but have specific requirements for dimensional stability and lightweight design. 5754H22 can be formed through simple stamping processes, and its rust-resistant properties prevent rust spots from appearing on interior parts in humid environments. Furthermore, compared to plastic materials, it enhances the texture and durability of interior trim.

5754-H32 aluminum

5754 H32 is formed through 30%-40% cold deformation followed by low-temperature annealing at 120-150℃, achieving a perfect balance between strength and plasticity—tensile strength is increased to 240-280MPa while maintaining an elongation of over 10%. This characteristic makes it the preferred material for automotive body panels, such as car door panels and engine hood panels.

7075 Aluminum Sheet

In the automotive field, the application of 7075 sheet is concentrated in critical parts with stringent strength requirements. Among these, battery pack structural components in new energy vehicles are one of its core application scenarios—the battery pack, as a major component of the vehicle's weight, needs sufficient strength to withstand collision impacts while also being lightweight to improve range.

Using 7075-T6 aluminum alloy to make the battery pack frame can achieve a 30%-50% weight reduction, while maintaining excellent toughness even at -40℃, enabling it to adapt to extreme climates in different regions.

In addition, 7075 aluminum alloy is used in key components of automotive suspension systems, such as control arms and steering knuckles. These components are subjected to repeated impacts and bending stresses during vehicle operation. The high yield strength (455-495 MPa) and excellent wear resistance of 7075-T6 ensure that they are not easily deformed during long-term use, thus improving driving safety.

However, it should be noted that 7075 aluminum alloy has poor weldability and is highly susceptible to cracking. Therefore, in automotive manufacturing, riveting or adhesive bonding processes are often used instead of fusion welding, which limits its application to high-end models and performance cars.

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