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A Popular Lightweight Material: Aluminum 5754

As the automotive industry accelerates its transformation towards lightweight, aluminum alloys are becoming a key force in reshaping the industry landscape. Among them, 5754 aluminum has quietly occupied an important position in the fields of body structure, new energy components, etc. with its unique combination of properties. How does this seemingly ordinary aluminum-magnesium alloy stand out in the fiercely competitive automotive materials market?

aluminium 5754 sheet.jpg

As a representative of Al-Mg alloys, 5754 aluminum sheet has a magnesium content of up to 2.6-3.6%. This composition design gives it three core advantages:

Corrosion resistance: In marine environments, its salt spray corrosion resistance is more than three times that of ordinary steel, making it particularly suitable for manufacturing new energy vehicle battery pack shells.

Weldability: When using MIG welding, the weld strength can reach 90% of the parent material, which is better than 80% of 6061 aluminum alloy.

Formability: By optimizing the rolling process, deep drawing of 1.2mm ultra-thin sheets can be achieved to meet the needs of complex body curves.

These characteristics make it an ideal choice for lightweighting of automobiles by balancing lightweight (density 2.66g/cm³) and safety.

Specific applications

Body structure parts:

Jaguar XJ220 uses 5754-T6 aluminum alloy to manufacture the door inner panel, reducing weight by 35% while improving dent resistance by 20%.

Chery Jaguar Land Rover's all-aluminum body uses RC5754 alloy (containing 75% recycled aluminum), achieving a 75% aluminum alloy application ratio.

Key components of new energy:

Battery pack shell: A car company uses 5754-H112 sheet to achieve IP67 protection level through laser welding, and the cost is 18% lower than that of steel shell.

Motor end cover: The casting in 5754-T4 state is treated with T6 secondary aging, and the fatigue life is increased to 10^7 cycles.

Special vehicles:

Tank truck tank: 5754-O state sheet still maintains 180MPa tensile strength at -40℃ low temperature environment, which is 40% lighter than carbon steel.

According to industry data, the global automotive 5754 aluminum alloy will exceed 200,000 tons in 2025, with an average annual growth rate of 12%.

Main tempers of 5754 alloy

Tempers	Process characteristics	Typical applications	Performance parameters
T4	Solution treatment + natural aging	Parts that require subsequent forming	Tensile strength 230MPa, elongation 22%
T6	Solution treatment + artificial aging	High-load structural parts	Tensile strength 265MPa, hardness HB70
H112	Natural aging after hot working	Tank body, car body plate	Tensile strength 180MPa, yield strength 80MPa
aluminium 5754 h111	Moderate work hardening and incomplete annealing	Parts with comprehensive requirements for formability and strength, such as some body panels and brackets with complex shapes	Tensile strength 190-220MPa, yield strength 85-110MPa, elongation about 18%