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Automotive Aluminum Plate

Automotive aluminum plate

    Back to the time in 1910, aluminum plate has already been used in public transportations. After decades’ development, nowadays, most of the bodies of fuel-tank trucks, semi-trailers and trailers are made of aluminum plate products. In the meantime, there is an increment in the use of aluminum plate products in passenger cars, so, in the near future aluminum car bodies must occupy the advantage in the market.

    The most commonly used aluminum alloys plate in automotive industry: 5083-O, 5182-O, 5754-O, 6014 T6, 6022 T6, 6063 T6, 6111 T4, 6016 T4, 7075 T6, T651.



    There are serious advantages for the application of aluminum in autos, such as higher strength-to-weight ratio, higher fuel efficiency, and better formability. As a result, in such a tough period regarding to energy and environmental issues, aluminum plays an essential role in weight lightening, and fuel efficiency increment to ease the energy and environmental problems.

 


    Signi aluminum is capable of providing various aluminum plate and profiles for automotive industries, which can be used in truck chassis, oil tank, passenger car body panel, body structure and heat exchange system etc.



Classic alloy:  5182, 5083, 6016, 6011, 6N12, 6014, 6181A, 6009, 6005A, 6061, 6082                      

Product character: good weldability, good formability, superb bake hardening ability.

 

Specifications
Alloys (AA) Temper Thickness range (mm) Length range (mm) Width range (mm)
 
5182, 5083, 6016, 6011, 6N12, 6014, 6181A, 6009, 6005A, 6061, 6082                      
F and O
H111, H112, T4, T6 (For 6061, 6063), T651(Stretched plate)
6 —   300 1000 — 10000 500 — 2700

 
Stretched aluminum plate
Thickness limit 6 — 70 mm
Length limit 2000 — 10000 mm
 
Chemical composition
Alloy (%) 5182 5083 6181A 6005A 6061 6082
Si 0.20 0.40 0.8~1.2 0.50~0.9 0.40— 0.80 0.7~1.3
Fe 0.35 0.40 0.45 0.35 0.70 0.50
Cu 0.15 0.10 0.10 0.30 0.15— 0.40 0.10
Mn 0.20~0.50 0.40— 1.0 0.15 0.50 0.15 0.40~1.0
Mg 4.0~5.0 4.0— 4.9 0.6~1.0 0.40~0.7 0.8— 1.2 0.6~1.2
Cr 0.10 0.05— 0.25 0.10 0.30 0.04— 0.35 0.25
Ni
Zn 0.25 0.25 0.20 0.20 0.25 0.20
Ti 0.10 0.15 0.10 0.10 0.15 0.10
Each (Others) 0.05 0.05 0.05 0.05 0.05 0.05
Total (Others) 0.15 0.10 0.10 0.15 0.15 0.15
Al Remaining Remaining Remaining Remaining Remaining Remaining
Single number indicates maximum content.
 
Current Practice in Aluminum Sheet Forming
 
*Cold forming-- forming at room temperature
*Warm forming-- forming at elevated temperature (<350℃)
 The formability of aluminum alloys increases with increasing temperature and decreasing strain rate.
 The blank( and sometimes the dies) should be heated.
 More complex tools are required and insulation is necessary if the dies are heated.
 Cycle time is longer than cold forming due to heating process.
 Lubricants that perform well at elevated temperatures should be used.
 Springback is reduced.





Density, Elastic modulus and anisotropy of aluminum vs. That of steel

* The density of aluminum(2.7g/cm3) is one third of steel(7.85g/cm3), Thus, weight can be reduced.
* Elastic modulus of aluminum(70 Gpa) is one third of steel (210Gpa). As a result, the parts previously designed for steel need to be redesigned to achieve the same stiffness.


Material Steel Aluminum
Mild 140/270 HSLA
350/450
DP 500/800 MS 1250/1520 5754-O 6060 T6 7021 T6
UTS(Mpa) 270 450 800 1520 130 245 430
 
* Smaller elastic modulus also results in more springback compensation(assuming the strengths are the same).
* Anisotropy values are lower than steel.




Packing
Aluminum Plate : Aluminum Plates are placed in wooden boxes on wooden skids with runners along the length of the sheet. They are wrapped in HDPE with hardboard on top and bottom of the stack. Hoop iron strapping runs along the length of the sheets. Silica gel packets are put in the boxes for moisture protection.(Aluminum plate)