3A21 Aluminum Sheet

3A21 Aluminum Sheet

  • Thickness: 0.1-500mm
  • Applications: car body skin, roof, floor, equipment insulation

WhatsApp for Price: + 86 189 5460 7915


3A21 aluminum sheet is the most widely used type of anti-rust aluminum. Its strength is not high (slightly higher than industrial pure aluminum). 3A21 aluminum plate can not be strengthened by heat treatment. So cold processing method is adopted to improve its mechanical properties.

JC Metal China is a 3000 Series Aluminum Sheet Supplier. The main type is 3003,3004,3005,3104,3105,3A21 aluminum sheet.

3A21 aluminum sheet Chemical Composition


3A21 Aluminum Sheet Characteristics

1. Good corrosion resistance. 3A21 aluminum is resistant to corrosion by many substances, such as air, freshwater, seawater, and certain acids.
2. High plasticity. 3A21 aluminum plate has high plasticity in annealing state, good plasticity in semi-quenching state and low plasticity in quenching state.
3. Good weldability. 3A21 aluminum plate has good spot welding, gas welding, argon arc welding and other welding effects.

Mechanical properties of 3A21 Aluminum Sheet

Tensile strength σb (MPa)120-160
Conditional yield strength σ0.2(MPa)≥85

Specimen Size: all wall thickness

Note: longitudinal mechanical properties of tubes at room temperature

3A21 heat treatment

Homogenization annealing
Heating 510 ~ 520 °C; heat preservation 4 ~ 6h; air cooling.

Rapid annealing
Heating 350 ~ 410 °C, holding time 30 ~ 120 min with different effective thickness, air or water cooling.

High temperature annealing
Heating 350 ~ 500 °C, holding time 10 ~ 30 min when finished product thickness ≥6mm. Product thickness < 6 mm, until the heat through; air-cooled.

Low temperature annealing
Heating 250 ~ 300 °C; holding time 1 ~ 3h; air or water cooling.

3A21 Aluminum Sheet price

  1. JC Metal China 3A21 Aluminum Sheet price = Ingot Cost/Raw aluminum cost + Processing cost.
  2. 3A21 Aluminum Sheet unit price is $/ton,$/kg,$/Pound,$/lbs.
  3. 3A21 Aluminum plate price will be different as per the below factors. Such as Length, Width, Thickness, State, Surfaces Treatment.
  4. Business Term: FOB,CFR,CIF,DDP,DUP…
  5. Payment Term: TT.LC.TT+LC…


1–Install wooden pallets. Use steel belts to reinforce them to avoid collisions during transportation.
2–Can be packed as per customer’s requirements.

Aluminum Sheet Plate Before Packing

Aluminum Sheet Plate After Packing

Aluminum Sheet Container Loading

3A21 Aluminum Plate Technical parameters

Typical alloy3A21, 3A21 aluminium plate
Material StateF,O,H12,H14,H16,H18,H19,H22,H24,H26,H28,H111,H112,H114
Typical products Car body skin, roof, floor, etc.

Market Applications

It is mainly used for low-load parts. Such as oil tanks, gasoline or lubricating oil conduit. All need high plasticity and good weldability, various liquid containers. Other small-duty parts are made by deep drawing.

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