What is Aluminum Circle Disk For Cookware?

Aluminum circle (also known as aluminum circle disc or aluminum disk) is a round aluminum blank processed from aluminum coils or sheets. It features high thermal conductivity, excellent heat dissipation, good ductility and corrosion resistance. More than half of the world’s cookware uses aluminum circle as the core raw material, because aluminum disk greatly improves the conductivity, heat resistance and formability of finished products.

1. Alloys & Specifications of Aluminum Circle

Aluminum circle products are divided into 4 main series: 1000, 3000, 5000 and 8000 series.

Common Alloys

aluminum circle 1050, aluminum circle 1060, 1100, 1200, aluminum circle 3003, 5052, 8011

Standard Specifications

Temper: O, H12, H14, H16, H18

Thickness: 0.3mm – 6.0mm

Diameter: 30mm – 1600mm

Standard: ASTM B209, GB/T 3880-2012, EN 485

HS Code: 7606.9100, 7606.9200

2.Chemical Composition of Aluminum Circle Disc

The chemical composition directly determines the performance of aluminum disk and aluminum circle.

3.Manufacturing Process of Aluminum Circle：

Over 80% of global aluminum circle output is produced in China. The production flow:

Unwind aluminum coils

Rough cutting into square blanks

Automatic punching into aluminum circle disc

Surface cleaning and inspection

Palletizing and packaging

Diameter below 800mm: automatic circle blanking line (high efficiency & precision)

Diameter above 800mm: sheeting machine (mainly for road signs)

4.Main Applications of Aluminum Circle：

Aluminum disk and aluminum circle are widely used in many industries:

Cookware: pots, pans, lids, kettles, pizza trays, fryers, bowls, non-stick cookware

Road signs: highway signs, traffic signs

Lighting reflectors: industrial high bay lights, traffic lights, recessed lights, stadium lighting

Others: anodized parts, center hole discs, lamp housings

High-quality aluminum circle uses 99.7% high-purity aluminum ingot, ensuring stable performance and high finished yield.

                                                   

5.Hot-Rolled vs CC/DC Aluminum Circle：

When choosing aluminum circle and aluminum circle disc, process difference is critical:

Hot-rolled aluminum circle: made from 400–500mm slab under high temperature; better surface, ductility and oxidation effect.

Cold-rolled aluminum circle: processed from 8mm aluminum coil; high dimensional accuracy.

CC aluminum circle: ideal for spinning process

DC aluminum circle: suitable for stamping and deep drawing

Aluminum Circle 1050 vs Aluminum Circle 3003

Aluminum Circle 1050

Pure aluminum, Al ≥ 99.5%

Excellent ductility, low cost

Suitable for ordinary pots, pans, kitchenware

Most popular in Middle East, Africa, Central Asia

Aluminum Circle 3003

Al-Mn alloy, higher strength

Better corrosion resistance

Used for pressure cookers, non-stick cookers, rice cookers

Price: about $50/ton higher than aluminum circle 1050

Quality Standard & Inspection of Aluminum Circle Disc

To ensure high yield in stamping and spinning, aluminum disk must pass strict inspection:

Surface quality: no deformation, scratches, cracks, stains, yellow spots or color difference

Chemical composition: spectral test complying with ASTM B209 / GB/T 3880-2012

Mechanical properties: tensile strength and elongation tested

aluminum circle 1050-O: 60–100 MPa, elongation ~35%

aluminum circle 1050 H12: ~100 MPa, elongation ~10%

Grain size: ≥ Grade 2 (regular); Grade 1 (high-end cookware)

Common quality risks: spinning cracking, orange peel surface, oxidation, weight shortage (standard tolerance ±3‰).

6.Factors Affecting Aluminum Circle Price：

Raw material: 99.7% high-purity ingot vs recycled scrap (price difference: $150–250/ton)

Alloy type: aluminum circle 3003 is more expensive than aluminum circle 1050

Dimension: ultra-thin, ultra-thick, large-diameter aluminum circle disc costs more

Production equipment: automatic lines improve precision and quality

Conclusion

Aluminum circle (aluminum circle disc / aluminum disk) is an essential material for cookware, road signs and lighting industries. Aluminum circle 1050 provides cost-effective performance for general applications, while aluminum circle 3003 offers higher strength and corrosion resistance for pressure cookware.

When purchasing aluminum circle, you should focus on raw material purity, mechanical properties, grain size, surface quality and production process.  Hunan Green House Aluminum Industry Co Ltd is a Chinese suppliers can provide full specifications, customized sizes, anodized and center-hole aluminum disk to support your production efficiency and product quality, please contact us freely:

Hunan Green House Aluminum Industry Co Ltd

E-mail: info@ghalumetal.com 

Whatsapp/wechat: +86-13760798572

Website: www.ghalumetal.com