Aluminum coil 3105 H21 with chrome-free conversion coating is a widely used material in modern industry. It offers good corrosion resistance, smooth surface, and stable mechanical properties.

This product is also environmentally friendly. The chrome-free conversion coating meets global standards and avoids harmful chemicals. It is suitable for construction, decoration, and industrial applications.

The 3105 aluminum alloy belongs to the 3000 series. It contains manganese as the main element. This gives it better strength than pure aluminum while keeping good formability.

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What is 3105 H21 Aluminum Coil?

Alloy Composition

Element	Content (%)
Aluminum (Al)	Balance
Manganese (Mn)	0.30 – 0.80
Magnesium (Mg)	0.20 – 0.80
Silicon (Si)	≤ 0.60
Iron (Fe)	≤ 0.70
Others	≤ 0.15

3105 aluminum is a non-heat-treatable alloy. It has medium strength and good corrosion resistance.

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Temper H21 Explained

Temper	Description
H21	Strain hardened + partially annealed
Strength	Medium
Formability	Good
Surface	Stable

H21 temper means the aluminum coil is hardened but still flexible. It is easy to bend and shape.

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Chrome-Free Conversion Coating

What is Chrome-Free Coating?

Chrome-free conversion coating is a surface treatment. It protects aluminum from corrosion without using chromium.

Benefits

• Eco-friendly and safe
• Meets RoHS and REACH standards
• Improves paint adhesion
• Enhances corrosion resistance
• Clean and uniform surface

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Product Specifications

Standard Sizes

Parameter	Range
Thickness	0.20 mm – 2.50 mm
Width	30 mm – 1600 mm
Coil Weight	1 – 8 tons
Inner Diameter	405 mm / 505 mm

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Mechanical Properties

Property	Value
Tensile Strength	130 – 210 MPa
Yield Strength	≥ 100 MPa
Elongation	≥ 10%

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Surface Types

Surface Type	Description
Mill Finish	Natural aluminum surface
Coated	PE / PVDF coating
Chrome-Free	Eco surface treatment
Painted	Color coated finish

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Product Types

1. Plain Aluminum Coil 3105 H21

This is the basic type. It has a smooth surface and natural finish.

• Used for general fabrication
• Easy to process
• Low cost

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2. Color Coated Aluminum Coil

This type is coated with paint like PE or PVDF.

• Many colors available
• Strong weather resistance
• Good for outdoor use

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3. Pre-Treated Aluminum Coil

This coil has chrome-free conversion coating before painting.

• Better adhesion
• Longer service life
• Ideal for high-end applications

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4. Embossed Aluminum Coil

The surface has patterns.

• Decorative appearance
• Anti-slip surface
• Used in interior design

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Applications

Aluminum coil 3105 H21 with chrome-free conversion coating is used in many industries.

Construction

• Roofing sheets
• Wall cladding
• Curtain wall panels

This material is light and corrosion resistant. It is perfect for buildings.

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Decoration

• Ceiling systems
• Interior panels
• Decorative boards

It gives a clean and modern look.

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Industrial Use

• HVAC systems
• Equipment covers
• Insulation jackets

The coil is easy to process and install.

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Transportation

• Trailer panels
• Vehicle body sheets

It reduces weight and improves efficiency.

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Advertising

• Sign boards
• Display panels

Smooth surface helps printing and coating.

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Advantages

Good Corrosion Resistance

The manganese content improves resistance to corrosion.

Eco-Friendly

Chrome-free coating avoids harmful chemicals.

Easy Processing

• Cutting
• Bending
• Stamping

All are easy with this alloy.

Cost-Effective

It offers a good balance between price and performance.

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Packaging

Item	Method
Inner Layer	Plastic film
Outer Layer	Waterproof paper
Protection	Wooden pallet
Edge Protection	Yes

Safe packaging ensures no damage during transport.

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Why Choose This Product?

• Stable quality
• Eco-friendly coating
• Wide size range
• Good surface performance
• Suitable for many industries

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Aluminum coil 3105 H21 with chrome-free conversion coating

Aluminum coil 3105 H21 with chrome-free conversion coating is a reliable and modern material. It combines strength, flexibility, and environmental safety.

It is widely used in construction, decoration, and industry. With good surface treatment and stable quality, it meets the needs of global markets.

If you need a durable and eco-friendly aluminum coil, this product is a smart choice.