3A21 aluminum plate is an Al Mn alloy. 3A21 aluminum plate is a widely used rust proof aluminum with low strength and cannot be strengthened by heat treatment. Therefore, cold working method is often used to improve its mechanical properties; It has high plasticity in the annealed state, good plasticity in semi cold work hardening, low plasticity in cold work hardening, good corrosion resistance, and good machinability.

Alloy grade

Si

Fe

Cu

Mn

Mg

Cr

Zn

Ti

Zr

other

AL

New brand

Old brand

0.60

0.70

0.20

1.0-1.6

0.05

——

0.10

0.15

——

each

total

3A21

LF21

0.05

0.10

allowance

Alloy grade, aluminum alloy grade and condition	Rm/Mpa	Rp0.2/Mpa	Elongation rate/%	Hardness/HBW α
3A21-H112	120	——	16	——