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Aluminum Alloy Sheet Metal for Car Shell

In the automotive field, in 1895, the Frenchman Buschdieu used aluminum, a light metal, for the first time in automobile production. The aluminum he used was Al-Cu-Mg-Mn-Si alloy, which is easy to peel. It can be seen that the technical level of today's aluminum sheet metal body panels started from the simplest and most basic door latch door.

sheet metal body panels.jpg

At present, there are two main series of automotive aluminum sheets: 5000 series and 6000 series. 6000 series alloys are divided into two categories: copper-containing (such as 6111) and basically copper-free (such as 6016, 6022, 6181). The former has high bake hardenability, but is sensitive to filamentous corrosion; the latter has high bake hardenability, good formability, good corrosion resistance.

Among the 5000 series alloys, there are alloy plates with high magnesium content (such as alloy 5182), which have higher strength and good formability, but are more sensitive to intergranular corrosion; alloy plates with medium magnesium content (such as 5754) have good intergranular corrosion resistance and good formability; alloy plates with low magnesium content (such as 5052) mainly have lower strength.

Alloy	Alloy elements
Alloy	Si	Fe	Cu	Mn	Mg
6016	1.0～1.5	<0.50	<0.20	<0.20	0.25～0.60
6022	0.8～1.5	0.05～0.20	0.01～0.10	0.02～0.10	0.45～0.70
6111	0.7～1.1	<0.40	0.50～0.90	0.15～0.45	0.50～1.0
5022	<0.25	<0.40	0.20～0.50	<0.10	3.50～4.9
5023	<0.25	<0.40	0.20～0.50	<0.10	5.0～6.2
5182	<0.20	<0.35	<0.10	0.20～0.50	4.5～5.0

Alloy	Temper	E/MPa	Poisson's ratio	Density kg/m3	Yield strength MPa	Tensile strength MPa	Elongation%
6111	T4pd	69000	0.3	2.89×10-3	146.0	290.0	25.0
6022	T4Pd	69000	0.3	2.86×10-3	122.0	238.0	30.0
5182	O	69000	0.3	2.84×10-3	123.0	276.0	25.6
5023	O	69000	0.3	2.85×10-3	124.0	280.0	32.0

Alloy	Temper	Thick ness	Uniform elongation %	n value (deformation 6% ~ 12%)	K value (deformation 6% ~ 12%)	r value (deformation 6% ~ 12%)	FLD0 %	Cold bending is perpendicular to the rolling direction d=0, 180° (sample width 70mm)
6111	T4Pd	0.9	18.0	0.23	540.0	0.65	22.8	Not cracked
6022	T4Pd	0.9	19.0	0.25	525.0	0.66	23.2	Not cracked
5182	O	0.9	21.0	0.32	514.0	0.82	22.2	Not cracked
5023	O	0.9	22.0	0.31	520.0	0.85	26.5	Not cracked