3A21-O

Aluminum

3A21 (GB/T 3190)

3A21-O supplied by Shanxi Youte Steel (jlhsteel.net).

Chemical Composition (%)

MN	1
SI	0.6
FE	0.7
CU	0.2

Chinese Standard

T 3190

Equivalent Standards

LF21

Applications

Aerospace, automotive, construction, packaging, electrical.

Available Forms

Sheet, Plate, Bar, Extrusion, Foil, Tube, Wire

Uses

Aluminium alloy with good strength-to-weight ratio, corrosion resistance and recyclability. Silicon (≈0.6%) improves castability and lowers thermal expansion. Copper (≈0.2%) raises strength and hardness via precipitation hardening. Used in transport, aerospace, packaging, building and electrical applications.

Heat Treatment

Heat-treatable variants solution treated 470–540 °C and aged (T4/T6); non-heat-treatable grades are strain-hardened. Anneal 340–415 °C.

Precautions

Use sharp, high-rake tooling and appropriate coolants; galling/adhesive wear can occur. Titanium reacts with hydrogen and chlorine — keep out of pickling/HCl environments.

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