Circle Aluminium 6061 T6
What Is Circle Aluminium 6061 T6?
Circle aluminium 6061 T6 is a round, disc-shaped aluminum blank made from 6061-grade aluminum alloy in the T6 temper condition. It combines the excellent mechanical strength of 6061 alloy with the full hardness achieved through T6 heat treatment.
The 6061 alloy belongs to the 6xxx series aluminum alloys. Its main alloying elements are magnesium (Mg) and silicon (Si). These elements give 6061 aluminum its signature combination of strength, corrosion resistance, and machinability.
The T6 temper means the aluminum has been solution heat-treated and then artificially aged. This process maximizes the strength of the material. A 6061 T6 aluminum circle is significantly stronger than the same alloy in the O (annealed) or T4 temper.
Circle aluminum in 6061 T6 grade is a popular choice for engineering, aerospace, automotive, and industrial applications. It works where strength matters but weight must stay low.
Unlike 1060 aluminum circles (which are soft and used mainly for cookware), 6061 T6 aluminum circles are hard, strong, and designed for structural and mechanical use.
What Is the Difference Between 6061 Aluminum and 6061-T6 Aluminum?
This is one of the most common questions buyers ask. The answer is simple.
6061 Aluminum = The Alloy
“6061 aluminum” refers to the alloy composition. It tells you what the material is made of:
- Silicon (Si): 0.40–0.80%
- Magnesium (Mg): 0.80–1.20%
- Copper (Cu): 0.15–0.40%
- Chromium (Cr): 0.04–0.35%
- Aluminum (Al): Balance
6061-T6 Aluminum = The Alloy + Heat Treatment
“6061-T6” tells you both the alloy composition AND the temper condition.
The T6 temper involves two steps:
- Solution heat treatment: The aluminum is heated to around 530°C and then rapidly quenched in water. This puts alloying elements into solid solution.
- Artificial aging: The quenched aluminum is heated again to around 160–180°C for several hours. This causes fine precipitates to form inside the metal. These precipitates block dislocation movement and increase strength.
Strength Comparison
| Temper | Tensile Strength | Yield Strength | Elongation |
|---|---|---|---|
| 6061-O (Annealed) | 124 MPa | 55 MPa | 25% |
| 6061-T4 | 241 MPa | 145 MPa | 22% |
| 6061-T6 | 310 MPa | 276 MPa | 12% |
6061-T6 is nearly 2.5 times stronger than 6061-O.
Which One Should You Buy?
- Buy 6061-T6 if you need maximum strength for structural or mechanical parts.
- Buy 6061-O if you need to do heavy forming, deep drawing, or bending into tight radii.
- Buy 6061-T4 if you need a balance between formability and strength.
For most engineering applications, circle aluminium 6061 T6 is the correct choice.
Key Properties of 6061 T6 Aluminum Circle
6061 T6 aluminum offers an outstanding combination of properties. Here is what makes it the preferred choice for demanding applications.
High Strength-to-Weight Ratio
6061-T6 has a tensile strength of 310 MPa and weighs only 2.70 g/cm³. Steel typically has a density of 7.85 g/cm³. This means 6061 T6 aluminum delivers strong performance at one-third the weight of steel.
Excellent Corrosion Resistance
6061 aluminum forms a natural oxide layer that protects the surface from corrosion. It performs well in:
- Outdoor environments
- Marine conditions (with anodizing)
- Industrial atmospheres
Good Machinability
6061-T6 machines cleanly and precisely. It is one of the most machinable aluminum alloys. CNC machining, drilling, milling, and turning all produce good results with sharp tools and proper cutting parameters.
Weldability
6061 aluminum welds well with TIG and MIG processes using 4043 or 5356 filler wire. Note: welding reduces strength in the heat-affected zone (HAZ). Post-weld heat treatment can restore some strength.
Anodizing Response
Circle aluminium 6061 T6 anodizes very well. The anodized surface is hard, wear-resistant, and decorative. This is important for aerospace and consumer product applications.
Good Fatigue Resistance
6061-T6 resists cyclic loading better than many other aluminum alloys. This makes it suitable for parts that experience repeated stress.
Full Property Table
| Property | Value |
|---|---|
| Density | 2.70 g/cm³ |
| Tensile Strength | 310 MPa |
| Yield Strength | 276 MPa |
| Elongation | 12% |
| Hardness (Brinell) | 95 HB |
| Elastic Modulus | 68.9 GPa |
| Thermal Conductivity | 167 W/(m·K) |
| Melting Range | 582–652°C |
| Machinability Rating | Good |
| Weldability | Good |
Circle Aluminium 6061 T6 Specifications
We supply 6061 T6 aluminum circles in a wide range of sizes. Here are standard specifications available.
Diameter Range
- Minimum: 10 mm
- Maximum: 1500 mm
- Custom diameters available on request
Thickness Range
- Minimum: 0.5 mm
- Maximum: 300 mm
- Common thicknesses: 1 mm, 2 mm, 3 mm, 5 mm, 6 mm, 10 mm, 12 mm, 15 mm, 20 mm, 25 mm
Temper Options
- T6 (most common — solution treated + artificially aged)
- T4 (solution treated + naturally aged)
- T651 (T6 + stress relieved by stretching)
- O (annealed)
Surface Finish Options
- Mill finish
- Anodized (clear or color)
- Brushed
- Polished
Tolerance Standards
- Diameter tolerance: ±0.5 mm (standard), ±0.1 mm (precision)
- Thickness tolerance: ±0.05 mm (standard)
- Flatness: ≤ 1 mm/m
Compliance Standards
- ASTM B209 (aluminum sheet and plate)
- AMS 2770 (heat treatment)
- EN 485-2 (European mechanical properties)
- GB/T 3880 (Chinese standard)
What Is Aluminium 6061-T6 Used For?
6061-T6 aluminum is one of the most versatile engineering alloys in the world. Circle aluminium 6061 T6 specifically serves applications that need round, disc-shaped aluminum components.
1. Aerospace Components
Aerospace engineers choose 6061 T6 aluminum circles for:
- Bulkheads and frames
- Wing fittings
- Fuselage panels
- Instrument housings
The high strength-to-weight ratio makes 6061-T6 ideal for reducing aircraft weight without sacrificing structural integrity.
2. Automotive and Transportation
Circle aluminum in 6061-T6 grade appears in:
- Wheel hubs and spacers
- Brake system components
- Drive shafts
- Racing car components
- Truck and trailer parts
Weight reduction in vehicles improves fuel efficiency. 6061-T6 aluminum delivers the strength needed while cutting weight.
3. Marine Applications
6061 T6 aluminum circles work well in marine environments because 6061 resists saltwater corrosion. Common uses include:
- Boat fittings and flanges
- Marine hardware
- Propeller components
- Deck hardware
4. CNC Machined Parts
Circle aluminium 6061 T6 is a popular starting blank for CNC machining shops. Machinists start with a round disc and machine it into:
- Flanges
- Pistons
- Valves
- Pulleys
- Gears
The round disc shape eliminates waste when making round parts.
5. Sporting Goods and Equipment
6061-T6 aluminum appears in high-performance sporting equipment:
- Bicycle components (hubs, stems, handlebars)
- Rock climbing gear
- Archery equipment
- Firearm components
6. Electronic and Electrical Components
6061 T6 aluminum circles are used for:
- Heat sink bases
- Electronic enclosures
- Motor housings
- RF shielding components
7. Industrial Machinery
Many industrial applications rely on circle aluminum plate in 6061-T6:
- Pump impellers
- Compressor parts
- Valve bodies
- Pressure vessel components
8. Medical Devices
Medical device manufacturers use 6061-T6 for:
- Surgical instrument components
- Medical equipment housings
- Orthopedic device parts
The combination of strength, machinability, and biocompatibility makes it a good fit for medical applications.
Can You Bend Aluminium 6061-T6?
Yes, you can bend 6061-T6 aluminum — but it requires care. This is an important question for buyers who plan to form circle aluminium 6061 T6 after purchase.
The Challenge with Bending 6061-T6
6061-T6 is hard and has relatively low elongation (about 12%). This means it has less room to stretch before cracking compared to softer alloys like 1060 or 3003.
When you bend 6061-T6 too aggressively, it can:
- Crack on the outside of the bend
- Spring back significantly after forming
- Fracture at tight bend radii
Minimum Bend Radius for 6061-T6
The minimum safe bend radius depends on thickness:
| Thickness | Minimum Bend Radius (6061-T6) |
|---|---|
| 0.5 mm | 1.5 mm |
| 1.0 mm | 3.0 mm |
| 2.0 mm | 6.0 mm |
| 3.0 mm | 9.5 mm |
| 6.0 mm | 19.0 mm |
As a general rule: minimum bend radius = 3 × material thickness for 6061-T6.
Tips for Bending 6061-T6 Successfully
- Use a large bend radius — never force tight bends
- Bend across the grain — bend perpendicular to the rolling direction
- Apply heat carefully — warming to 150°C can improve ductility slightly
- Use 6061-O or T4 temper if you need tighter bends — then age harden afterward
- Avoid sharp tooling — use properly radiused press brake tooling
Better Alternatives for Tight Bending
If your project requires tight bends, consider:
- 6061-O (annealed) — much more bendable, lower strength
- 5052-H32 — excellent formability with good strength
- 3003-H14 — very good formability for less demanding applications
For most structural circle aluminium 6061 T6 applications, bending is not required. The discs are machined, not bent.
Is Aluminum 6061 T6 Cheaper Than Steel?
This is a practical question for buyers comparing materials. The answer depends on how you measure cost.
Raw Material Price: Steel Wins
By weight, steel is much cheaper than 6061-T6 aluminum. As a rough comparison:
- Mild steel: ~$0.60–$1.00 per kg
- 6061-T6 aluminum: ~$3.00–$5.00 per kg
Steel costs about 3–5 times less per kilogram than 6061 T6 aluminum.
Total Project Cost: Aluminum Often Wins
When you look beyond raw material price, aluminum becomes more competitive:
| Factor | 6061-T6 Aluminum | Steel |
|---|---|---|
| Raw material cost | Higher | Lower |
| Weight (same volume) | 1/3 of steel | Heavier |
| Machining speed | Faster | Slower |
| Tool wear | Lower | Higher |
| Corrosion protection needed | No (self-protecting) | Yes (paint/coating) |
| Shipping cost | Lower (lighter) | Higher |
| Lifetime maintenance | Low | Higher |
When 6061-T6 Aluminum Saves Money vs Steel
- Aerospace and automotive: Weight savings reduce fuel costs over the vehicle’s lifetime
- Marine applications: No rust means no repainting or replacement costs
- Machined parts: Faster machining reduces labor costs
- Structural parts: Lighter weight reduces foundation and support costs
The Bottom Line
Steel is cheaper to buy. Aluminum is often cheaper to use.
For applications where weight, corrosion resistance, and machining speed matter, circle aluminium 6061 T6 delivers better total value than steel — even at a higher purchase price.
Circle Aluminum Disc vs Circle Aluminum Plate vs Circle Aluminum Sheet
Buyers often see these three terms used for similar products. Here is how they differ.
Circle Aluminum Sheet
- Refers to thin, flat round aluminum blanks
- Typical thickness: 0.3 mm to 6 mm
- Lightweight and flexible
- Used for: stampings, covers, decorative discs, light-duty applications
- Common alloys: 1060, 3003, 5052
Circle Aluminum Disc
- General term for any round aluminum blank
- Can be thin (sheet) or thick (plate)
- This is the most commonly used term for round aluminum blanks
- Circle aluminum disc in 6061-T6 usually means medium to heavy thickness
- Used for: CNC machining starting blanks, flanges, mechanical components
Circle Aluminum Plate
- Refers to thick, round aluminum blanks
- Typical thickness: 6 mm and above
- Heavy and rigid
- Used for: structural components, heavy machined parts, pressure vessels
- Circle aluminum plate in 6061-T6 is common in aerospace and industrial machining
Quick Reference
| Term | Thickness | Common Use |
|---|---|---|
| Circle Aluminum Sheet | 0.3–6 mm | Covers, stampings, decorative |
| Circle Aluminum Disc | Any thickness | General round blanks, machining |
| Circle Aluminum Plate | 6 mm+ | Heavy machined parts, structural |
For circle aluminium 6061 T6, buyers most often request:
- Disc form for CNC machining (medium thickness: 5–50 mm)
- Plate form for heavy structural parts (50–300 mm)
How to Choose the Right 6061 T6 Aluminum Circle Supplier
Choosing the right supplier affects your part quality and delivery schedule. Here are the key factors to check.
1. Verify Material Certification
Always request a mill test certificate (MTC) for your 6061 T6 aluminum circle. The certificate should confirm:
- Alloy composition (chemical analysis)
- Mechanical properties (tensile strength, yield strength, hardness)
- Temper condition (T6)
- Heat treatment records
2. Check Dimensional Accuracy
6061-T6 circles used for CNC machining need tight dimensional tolerances. Ask your supplier about:
- Diameter tolerance
- Thickness tolerance
- Flatness tolerance
Poor flatness wastes time and material in machining.
3. Confirm Surface Quality
The surface should be free from:
- Cracks or laps
- Deep scratches
- Oxide inclusions
- Porosity
Request photos or samples before ordering.
4. Ask About Stock vs Custom Production
Some suppliers stock standard sizes. Others produce to order. If you need non-standard diameters or thicknesses, confirm the supplier can produce them and ask about lead times.
5. Check Export Experience
If you are importing circle aluminium 6061 T6, work with suppliers who have experience in:
- Export documentation (commercial invoice, packing list, certificate of origin)
- Proper packaging for ocean freight
- International quality standards (ASTM, EN, AMS)
6. Request Samples
For new suppliers, always order a sample before placing a large order. Test the material properties in your own facility or through a third-party lab.
Why Choose Us as Your Circle Aluminium 6061 T6 Manufacturer
We are a professional manufacturer of circle aluminium 6061 T6 with over 15 years of production experience. Global buyers in aerospace, automotive, marine, and industrial sectors trust us.
✅ Certified 6061-T6 Material
Every batch of our 6061 T6 aluminum circles comes with full mill test certificates. Chemical composition and mechanical properties are verified. We comply with ASTM B209, AMS 2770, and EN 485-2.
✅ Wide Size Range
We supply circle aluminum from 10 mm to 1500 mm diameter and 0.5 mm to 300 mm thickness. Custom sizes are welcome.
✅ Precision Cutting
We use CNC water jet cutting and precision sawing to produce circles with accurate dimensions and smooth edges. Diameter tolerance as tight as ±0.1 mm is available.
✅ Multiple Surface Finish Options
We offer mill finish, anodized, brushed, and polished surfaces on 6061 T6 aluminum circles. Tell us your requirements and we will match them.
✅ Competitive Factory Pricing
As a direct manufacturer, we offer factory-direct pricing. No middlemen. Better margins for your business.
✅ Fast Delivery
- Standard sizes: 7–15 business days
- Custom sizes: 15–25 business days
- Rush orders available on request
✅ Flexible Order Quantities
We accept trial orders and bulk orders. Contact us to discuss your specific quantity requirements.
✅ Global Export Experience
We export circle aluminium 6061 T6 to the USA, Canada, Germany, UK, Australia, UAE, South Korea, and more than 35 countries worldwide.
✅ Full Technical Support
Our engineering team helps you select the right temper, thickness, and diameter for your application. Free technical consultation with every inquiry.
Frequently Asked Questions (FAQ)
Q: What is the standard temper for circle aluminium 6061?
A: The most common temper is T6. It provides maximum strength. T651 (stress relieved) is also popular for precision machining applications.
Q: Can 6061-T6 aluminum circles be anodized?
A: Yes. 6061-T6 anodizes very well. The anodized layer improves hardness, wear resistance, and appearance.
Q: What is the maximum diameter you can supply?
A: We supply circle aluminium 6061 T6 up to 1500 mm diameter. Larger sizes are available on special request.
Q: Do you supply 6061-T651 aluminum circles?
A: Yes. T651 temper (stress relieved by stretching) is available for buyers who need improved dimensional stability during machining.
Q: How do you cut the aluminum circles?
A: We use CNC water jet cutting, laser cutting, and precision sawing depending on thickness and diameter. All methods produce clean, accurate edges.
Q: What is the difference between 6061-T6 and 7075-T6 aluminum?
A: 7075-T6 is stronger (tensile strength ~572 MPa vs 310 MPa for 6061-T6) but less corrosion-resistant and harder to weld. 6061-T6 offers a better balance of strength, corrosion resistance, weldability, and cost for most applications.
Q: Can I get a custom diameter not listed in your standard range?
A: Yes. We produce custom diameters to your exact specifications. Please provide your drawing or dimensions when you inquire.
Conclusion
Circle aluminium 6061 T6 is one of the most capable and versatile aluminum products available. It delivers high strength, good corrosion resistance, excellent machinability, and reliable performance across aerospace, automotive, marine, and industrial applications.
Whether you need thin circle aluminum sheets, medium-thickness circle aluminum discs, or heavy circle aluminum plate, we supply the right size and specification for your project.
Contact us today for free samples, mill test certificates, and a competitive factory price. Our team responds within 24 hours.
