3A21 aluminum alloy is a high-quality aluminum alloy. Common 3A21 H14 H24 aluminum sheets are mainly used in automobile manufacturing. They have good formability and corrosion resistance, and can be used to manufacture body parts such as doors and roofs.
Why Choose Chalco Aluminum's 3A21 H14 H24 aluminum sheet for auto body?
Chalco auto body sheet production capacity
Chalco Aluminum has an acid-alkali cleaning and passivation unit for automobile plates, and the heat-treated (such as: T4, T4P, T6, T8X) 6000 series aluminum alloy plates produced can well meet the requirements of automobile shells.
Chalco Aluminum can provide automotive inner panels, outer panels, and automotive structural materials, realizing full coverage of key automotive lightweight panels, and the industrialization of automotive lightweight materials has entered a new stage.
Automotive IATF16949 standard
Chalco Aluminum has passed the requirements of the automotive IATF16949 standard audited by BSI (British Standards Institution), providing quality compliance for continuously expanding the automotive product market and achieving high-quality development.
Well-known brand material certifications
Chalco Aluminum serves Tesla, Ford, Shanghai Automobile, Weilai Automobile, Beiqi New Energy, Changan Automobile and other famous new energy automobile manufacturers. Some models of automotive plate material certification.
Specs of 3A21 H14 H24 aluminum sheet
| Temper | H14, H24 |
| ABS sheet dimension: | Thickness: 0.70-1.50mm |
| Width: 800-2400mm | |
| Length: 800-5500mm | |
| ABS coil dimension: | Thickness: 0.70-1.50mm |
| Width: 800-2400mm | |
| Standard |
GB/T 33227-2016, JIS H4000, ASTM B209, EN 485 |
Chemical composition of 3a21 aluminum alloy
| Element | Composition % |
| Si | 0.60 |
| Fe | 0.70 |
| Cu | 0.20 |
| Mn | 1.00-1.60 |
| Mg | 0.05 |
| Cr | - |
| Ni | - |
| Zn | 0.10 |
| Ti | 0.15 |
| Al | Remainder |
Property of 3A21 H14 H24 aluminum sheet
| Alloy Temper | Thickness mm | Tension Strength Rm N/mm2 | Yield Strength R p0.2 N/mm2 | Elongation A 50 min % |
| 3A21 H14 | 0.80-1.30 | 145-215 | - | ≥6 |
| 1.30-4.50 | ||||
| 3A21 H24 | 0.20-1.30 | ≥145 | - | ≥6 |
| 1.30-4.50 |
Other requirements of aluminum car body sheet metal
| Flange performance | The grade of flanging of panels and strips for body panels is grade 1 or grade 2. If other products require flanging performance, it should be indicated in the order (or contract). |
| Paint brush line | The grade of paint brushing line for panels and samples of body panels is grade 1 or grade 2. When other products require the performance of paint wire, it should be indicated in the order (or contract). |
| Anti-dent performance | When the buyer has requirements on the dent resistance performance of the panels and strips used for body panels, the supplier shall provide relevant data on the dent resistance performance. |
| FLD performance | When the purchaser has FLD performance requirements for panels and strips used for body panels，the supplier shall provide relevant data on FLD performance. |
| High speed tensile properties | When the buyer has high-speed drawing performance requirements for the panels and strips used for body panels, the supplier shall provide relevant data on the high-speed drawing performance. |
| Microstructure | The microstructure of sheets and strips subjected to solution heat treatment is not allowed to be over-burned. |
| Oil amount | The oiling of the product is most determined through negotiation between the supplier and the buyer, and is indicated in the order form (or contract). |
| Passivation film thickness | The passivation film thickness of the product is determined through negotiation between the supplier and the buyer, and is specified in the order form (or contract). |
| Appearance Quality | Defects such as surface roughness, slight unevenness, scratches, color difference and small prints are allowed on the surface of panels and strips for inner panels of body panels and panels and strips for body structural parts, which do not affect the formability. |
| Defects such as cuts and marks that affect the use are not allowed on the outer surface of the panels and strips used for the outer panels of the body panels, and defects such as slight color difference, such as paint openings and cover-ups, are allowed. |
Thickness deviation of 3A21 H14 H24 aluminum sheets and strips for body panels
| Thickness mm | Thickness tolerances within the following width ranges | ||
| 800.0-1600.0 | >1600.0-1800.0 | >1800-2400.00 | |
| 0.70-1.00 | ±0.03 | ±0.05 | ±0.08 |
| >1.00-1.20 | ±0.04 | ±0.06 | ±0.09 |
| >1.20-1.50 | ±0.05 | ±0.07 | ±0.10 |
Width deviation of 3A21 H14 H24 aluminum sheets and strips for body structural parts
| Thickness mm | Width tolerances within the following width ranges | |||||||
| <100.0 | >100.0-300.0 | >300.0-500.0 | >500.0-800.0 | >800.0-1 250.0 | >1 250.0-1 800.0 | >1 800.0- 2 000.0 | >2 000.0-2 400.0 | |
| 0.30—1.60 | + 0, 3 0 | + 0, 4 0 | + 1.0 0 | + 1.5 0 | + 2, 0 0 | + 3.0 0 | — | — |
| >1.60—3.50 | — | — | — | + 2.0 0 | 4-3.0 0 | + 4.0 0 | + 5.0 0 | + 6.0 0 |
Length deviation of 3A21 H14 H24 aluminum sheets and strips for body panels
| Thickness mm | Length tolerances within the following length ranges | |
| 800.0-2 000.0 | >2 000.0 | |
| 0.70-1.50 | + 3.00 | + 5.0 0 |
Diagonal deviation of 3A21 H14 H24 aluminum sheets and strips for body panel
| Length mm | The allowable deviation of the two diagonal lengths of the board corresponding to the following width W | |
| 800.0-1 600.0 | >1 600.0-2 400.0 | |
| <3 000.0 | 1.2×W/300 | 1.0×W/300 |
| >3 000.0 | 1.0×W/300 | 0.8×W/300 |
Unevenness of 3A21 H14 H24 aluminum sheets and strips for body panel
| Thickness mm | The unevenness of sheets and strips within the following width ranges shall not be greater than | Termination area, warpage height | ||||
| <500.0 | >500.0-1 000.0 | >1 000.0-1 500.0 | >1 500.0-2 000.0 | >2 000.0 | ||
| 0.30-0.50 | 3 | 4 | 4 | 4 | — | ≤25 |
| >0.50-0.80 | 3 | 4 | 4 | 7 | 8 | |
| >0.80-1.60 | 3 | 4 | 4 | 6 | 8 | |
| >1.60-2.00 | 3 | 4 | 4 | 6 | 8 | |
| >2.00-3.50 | 3 | 4 | 4 | 6 | 8 | |
Features of 3A21 H14 H24 aluminum sheet
Good forming and processing performance: 3A21 aluminum sheet is easy to form, cut and weld, and can meet the processing needs of various body parts.
Good corrosion resistance: there is an oxide film on the surface of 3A21 aluminum sheet, which can effectively prevent the aluminum alloy from being oxidized in the air, so it has good corrosion resistance.
High strength: after proper heat treatment, 3A21 aluminum sheet can obtain high strength, which is suitable for manufacturing some automobile parts that need strength, such as engine cover and so on.
Lightweight: compared with steel, aluminum alloy has a lower density, so the use of 3A21 aluminum sheet can reduce the weight of the car itself and reduce fuel consumption.
Recyclability: aluminum alloys can be recycled and have less impact on the environment.
Uses of 3A21 H14 H24 aluminum sheet
3A21 H14 and H24 aluminum sheets are mainly used in automobile manufacturing and can be used to manufacture various body parts, such as:
Car doors: 3A21 H14 and H24 aluminum sheets have good formability and can be used to manufacture doors of various shapes, such as front doors, rear doors, etc.
Roof: 3A21 H14 and H24 aluminum sheets can be easily formed into arcs, suitable for making roofs and roof reinforcement bars.
Wheel covers: 3A21 H14 and H24 aluminum sheets can make lightweight, corrosion-resistant wheel covers to improve the aesthetics and durability of cars.
Engine cover: 3A21 H24 aluminum sheet has high strength and corrosion resistance, and is suitable for manufacturing parts that require strength and durability, such as automobile engine covers.
Interior decoration parts: 3A21 H14 and H24 aluminum sheets can also be used to manufacture automobile interior decoration parts, such as door panel interiors, central control panels, etc., to improve the aesthetics and practicality of the car.
What precautions should be taken when purchasing 3A21 H14 H24 aluminum sheet?
When purchasing 3A21 automotive body aluminum sheets, you need to pay attention to the following aspects:
Specifications and dimensions: confirm the required specifications and dimensions before purchasing to ensure that the purchased aluminum plates can meet the requirements for use.
Quality and certification: before purchasing, you should choose a supplier with qualification certification to ensure that the quality of the purchased aluminum plate meets the relevant standards and regulations.
Surface quality: check whether there are surface defects such as unevenness, oxidation, scratches, etc. on the surface of the aluminum plate to ensure that the surface quality meets the requirements.
Price: understand the reasonable price range according to market conditions, and choose suppliers with reasonable prices to purchase.
Packaging and transportation: confirm that the packaging of the aluminum plate is intact to avoid damage during transportation. Pay attention to moisture-proof, shock-proof, sun-proof and other issues during transportation to ensure that the quality of the aluminum plate is not affected.
In short, when purchasing 3A21 automotive body aluminum sheets, pay attention to specifications and dimensions, quality and certification, surface quality, price, packaging and transportation, etc., to ensure that the quality and use effect of the purchased aluminum sheets meet the requirements.
