If you are looking for a reliable, strong, and flexible metal, Aluminum Coil 3105 H21 is a top choice. This specific alloy is famous in the building and manufacturing industries. It offers a great balance between strength and workability.
Understanding Aluminum Alloy 3105 H21
The 3105 aluminum alloy is an aluminum-manganese-magnesium alloy. It belongs to the 3000 series, which means it has excellent resistance to corrosion. The “H21” part refers to the temper. This means the metal has been strain-hardened and then partially annealed to reach a specific strength level.
Key Characteristics
- Corrosion Resistance: It stays strong even in wet or humid weather.
- Formability: You can bend and shape it easily without cracking.
- Welding: It works well with most standard welding methods.
- Surface Finish: It accepts paint and coatings very well.
Technical Specifications and Data
To help you choose the right product, we have organized the technical data into clear tables. These details are essential for engineers and buyers.
1. Chemical Composition
The performance of Aluminum Coil 3105 H21 comes from its chemical mix.
| Element | Content (%) |
| Manganese (Mn) | 0.30 – 0.80 |
| Magnesium (Mg) | 0.20 – 0.80 |
| Iron (Fe) | 0.70 max |
| Copper (Cu) | 0.30 max |
| Silicon (Si) | 0.60 max |
| Aluminum (Al) | Remainder |
2. Mechanical Properties
The H21 temper provides a specific set of physical strengths.
| Property | Value |
| Tensile Strength | 145 – 185 MPa |
| Yield Strength | 115 MPa (typical) |
| Elongation | 5% – 15% |
Different Types of 3105 Aluminum Products
We offer a variety of 3105 products to meet your specific needs. Each type is designed for a different application.
Color-Coated Aluminum Coil 3105
This type is coated with PE or PVDF paint. It is perfect for outdoor use because the color stays bright for a long time. It is often used for roofing and wall cladding.
Embossed Aluminum Coil 3105
We can add patterns like orange peel or diamond shapes to the surface. This makes the metal look better and increases its surface area, which is great for refrigerators and cold storage.
Plain Mill Finish Coil
This is the raw metal without any coating. It is cost-effective and ideal for internal parts or items that will be processed later.
Specifications and Sizes
We provide Aluminum Coil 3105 H21 in many sizes. Below is a table showing the common ranges we supply.
| Specification | Range Available |
| Thickness | 0.2mm – 4.0mm |
| Width | 20mm – 1600mm |
| Inner Diameter | 505mm / 508mm |
| Weight per Coil | 1.0 – 5.0 Tons |
Why Use 3105 H21 Instead of Other Alloys?
Better Corrosion Resistance than 1000 Series
While the 1000 series is pure aluminum, the 3105 alloy has manganese. This makes it much stronger and better at resisting rust in salty or polluted air.
More Flexible than 3004
The 3105 alloy is often chosen over 3004 when the project requires more bending. It is less likely to break during the manufacturing process.
Common Applications of Aluminum Coil 3105 H21
Aluminum Coil 3105 H21 is a versatile material widely used across multiple industries. Below are the most common applications presented in both table and paragraph format:
| Application | Industry | Key Advantages |
|---|---|---|
| Residential Siding | Construction | Lightweight, easy installation, weather-resistant |
| Mobile Home Sheet | Automotive/Housing | Durable, corrosion-resistant, cost-effective |
| Rain Gutters & Downspouts | Construction | Rust-proof, excellent water management |
| Bottle Caps & Closures | Food & Beverage | Hygienic, tamper-proof, food-safe |
| Signage | Advertising/Transportation | Flatness, durability, visibility |
Detailed Applications
1. Residential Siding
Aluminum Coil 3105 H21 has become a popular choice for residential exterior cladding and siding. Homeowners and contractors favor this material because of its lightweight nature, which simplifies installation and reduces labor costs. The H21 temper provides excellent formability, allowing it to be shaped into various profile designs. Additionally, its natural corrosion resistance eliminates the need for extensive maintenance, and it can be easily painted or anodized to match any architectural style.
2. Mobile Home Sheet
The mobile home manufacturing industry relies heavily on Aluminum Coil 3105 H21 for constructing exterior and interior panels. This alloy’s combination of strength and light weight makes it ideal for vehicles that need to maintain fuel efficiency while providing structural integrity. The material’s excellent workability allows manufacturers to form complex shapes, and its inherent corrosion resistance ensures longevity even when exposed to harsh weather conditions during transport and stationary use.
3. Rain Gutters and Downspouts
One of the most practical applications of 3105 H21 aluminum is in gutter and downspout systems. Unlike steel, this aluminum alloy does not rust or corrode, making it ideal for continuous exposure to water and moisture. The H21 temper provides the right balance of strength and flexibility needed to maintain shape while handling water flow. These systems require minimal maintenance and can last decades, making them a cost-effective solution for protecting building foundations and walls from water damage.
4. Bottle Caps and Closures
The food and beverage industry utilizes thin gauges of Aluminum Coil 3105 H21 for manufacturing screw caps, crown caps, and other closure systems. The alloy’s food-grade properties ensure safety and hygiene compliance. Its excellent formability allows for tight sealing, tamper-evident features, and decorative embossing. The material’s barrier properties help preserve product freshness, and its lightweight nature reduces transportation costs for manufacturers.
5. Signage and Advertising Boards
Road signs, highway signage, and advertising billboards frequently use Aluminum Coil 3105 H21 as the substrate material. The alloy’s superior flatness and dimensional stability ensure that printed graphics remain crisp and undistorted. Its lightweight nature simplifies installation and reduces support structure requirements. The material’s excellent weather resistance means signs maintain their appearance over many years without significant degradation, and it can be easily painted, powder-coated, or used as a printing surface.
How to Maintain Your Aluminum Coils
Even though Aluminum Coil 3105 H21 is durable, proper care will make it last longer.
- Storage: Keep the coils in a dry, ventilated warehouse. Avoid moisture to prevent white rust.
- Cleaning: Use clean water and a mild detergent. Do not use harsh chemicals that can scratch the coating.
- Handling: Use proper lifting equipment to avoid denting the edges of the coil.
Frequently Asked Questions (FAQ)
Is 3105 H21 good for roofing?
Yes. It is very popular for roofing because it is lightweight and resists bad weather.
Can I get custom widths?
Yes. We can slit the coils into narrow strips or keep them wide based on your factory requirements.
Does it come with a protective film?
We can apply a PE or PVC film to the surface to protect it from scratches during transport and installation.
Aluminum Coil 3105 H21 supplier for sale
Selecting Aluminum Coil 3105 H21 is a smart move for any project that needs a mix of strength and beauty. Whether you are building houses or making small metal parts, this alloy delivers great results every time.
If you need a price list or more technical details, feel free to contact us today. We provide high-quality aluminum solutions for customers worldwide.
