High-quality 3105 aluminum sheet with excellent corrosion resistance and superior paintability. Widely used for roofing, curtain walls, cladding, and color-coated aluminum panels. Factory-direct supply with custom specifications available.
3105 aluminum sheet belongs to the aluminum-manganese (Al-Mn) alloy family, also known as the 3000 series. With an aluminum content of approximately 98%, it is a high-purity corrosion-resistant aluminum alloy. To further enhance its properties, magnesium (Mg), manganese (Mn), silicon (Si), and trace amounts of copper (Cu) are added to pure aluminum. As a result, 3105 retains the excellent workability of near-pure aluminum while offering significantly improved strength.
Similar to 3004 aluminum sheet, 3105 is a non-heat-treatable alloy. Its strength cannot be improved through heat-treatment processes such as quenching; instead, its mechanical properties are mainly achieved through cold working, such as cold rolling. This provides 3105 aluminum sheet with a highly competitive balance of strength, ductility, corrosion resistance, and cost efficiency.
| Temper | Features | Typical Applications |
| O | Softest condition with the highest elongation. | Suitable for very deep drawing, such as specially shaped containers. |
| H14 | Half-hard temper achieved by cold working. | The most widely used temper, balancing strength and bending performance; common in architectural sheet applications. |
| H16 / H18 | Progressively higher strength with reduced formability. | Suitable for flat support components requiring higher rigidity. |
| H24 | Strain-hardened and incompletely annealed. | Offers good stability and is the most commonly used temper for color-coated aluminum sheet. |
| H26 | Higher hardness while retaining some bending capability. | Commonly used for bottle-cap stock or electronic back panels. |
| Alloy | 3105, AA3105, Al3105 |
| Temper | O, H12, H14, H16, H18, H19, H22, H24, H26, H28, H112, etc. |
| Thickness | 0.1–500 mm |
| Width | 100–2650 mm |
| Length | 500–16000 mm |
| Standards | ASTM B209, EN 573, EN 485 |
| Finish | Mill finish, polished finish, high-precision polished sheet |
| Manufacturing Technology | Direct Chill Casting (DC), Continuous Casting (CC) |
| Processing Services | Cutting, slitting, bending |
| Typical Applications | Aluminum beer bottle caps, beverage bottle caps, cosmetic caps, color-coated aluminum coils, etc. |
| MOQ | 3 Tons |
Chemical Composition (%)
| Alloy | Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti | Others, Each | Others, Total | Al, Min. |
| 3105 | 0.60 | 0.70 | 0.30 | 0.3-0.8 | 0.2-0.8 | 0.20 | 0.40 | 0.10 | 0.05 | 0.15 | Remainder |
Physical Properties
| Property | Value |
| Density | 2.60–2.80 g/cm³ |
| Melting Range | Approx. 641°C |
| Thermal Conductivity | 160–173 W/m·K |
| Modulus of Elasticity | 69.5–70 GPa |
| Coefficient of Thermal Expansion | 23.1 × 10⁻⁶ /K |
Mechanical Properties
| Temper | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
| O | 110-145 | ≥55 | ≥20 |
| H12 | 145-165 | ≥110 | ≥10 |
| H14 | 165-185 | ≥135 | ≥6 |
| H16 | 185-205 | ≥160 | ≥4 |
| H18 | ≥205 | ≥185 | ≥3 |
| H22 | 145-165 | ≥110 | ≥12 |
| H24 | 165-185 | ≥135 | ≥10 |
1. Outstanding Corrosion Resistance and Weather Resistance
3105 aluminum sheet performs reliably in atmospheric, humid, and mildly corrosive industrial environments, making it suitable for long-term outdoor use.
2. Excellent Paintability
After surface treatment, 3105 aluminum sheet provides strong coating adhesion. It is widely used in color-coated aluminum sheets, coils, and decorative panels, with coatings that are less likely to peel or blister.
3. Good Formability and Processability
With good ductility, it is suitable for bending, stamping, roll forming, and other processing methods. It is less prone to cracking during fabrication.
4. Strong Cost Advantage
Compared with high-strength aluminum alloys, 3105 offers a lower cost and is suitable for high-volume projects, providing excellent value for money.
5. Green and Environmentally Friendly
A higher proportion of recycled aluminum can be used in its production. This not only reduces manufacturing costs but also supports the low-carbon and environmentally friendly goals of modern green manufacturing.
6. High Electrical Conductivity
Due to the addition of approximately 0.3% copper, 3105 aluminum sheet can achieve an electrical conductivity of up to 41% IACS (International Annealed Copper Standard), slightly higher than many other 3xxx-series aluminum alloys. It is particularly suitable for electronic and electrical applications requiring both conductivity and formability.
7. Medium Strength
In the H14 temper, 3105 aluminum alloy offers better mechanical properties than 1100 and 3003 aluminum alloys, while its strength remains lower than that of 5000- or 6000-series alloys.
Hot-rolled aluminum sheet
Cold-rolled aluminum sheet
Pre-painted aluminum sheet
Mirror-finish aluminum sheet
Embossed aluminum sheet
Architectural Exterior Decoration: Widely used for roofing panels, wall panels, rainwater pipes, gutters, and partitions for mobile homes.
Color-Coating Substrate: An ideal base material for fluorocarbon-coated aluminum sheets and roller-coated aluminum coils.
Packaging Solutions: Thanks to its good deep-drawing performance, it is commonly used for liquor bottle caps, beverage caps, and tamper-evident closures for pharmaceutical products.
Electronics and Industrial Applications: Used in computer case back panels, lighting reflectors, distribution panels, air-conditioner heat exchangers, and more.
HVAC Systems: Suitable for durable baffles, air ducts, and ventilation louvers.
1. Melting and Refining
Manganese and magnesium are added in precise proportions, and the molten aluminum is purified.
2. Continuous Casting / Hot Rolling
Slabs are formed. The hot-rolling process can provide better deep-drawing performance.
3. Multi-Pass Cold Rolling
The final thickness is precisely controlled, typically from 0.2 mm to 6.0 mm.
4. Annealing
Mechanical properties are adjusted through heat treatment to achieve the specified temper.
5. Finishing and Inspection
Tension leveling is used to ensure flatness. Products undergo strict quality inspection before packaging and delivery.
| Type | Details |
| 3105 Hot-Rolled Aluminum Sheet | Produced by hot rolling, with a more uniform structure, good ductility, and excellent secondary processing performance. Suitable for bending, stamping, stretching, and other fabrication processes. |
| 3105 Cold-Rolled Aluminum Sheet | Features high surface flatness and good thickness accuracy. Suitable for products with stringent requirements for dimensions, tolerances, and surface quality. |
| 3105 Pre-Painted Aluminum Sheet | Made from 3105 aluminum sheet coated with polyester or PVDF coatings. It offers rich color options and good weather resistance, commonly used for roofing, wall panels, rolling doors, and similar applications. |
| 3105 Mirror-Finish Aluminum Sheet | Polished or roll-finished to provide high reflectivity and decorative appeal. Suitable for lighting fixtures, decorative panels, signage, and more. |
| 3105 Embossed Aluminum Sheet | Embossed with five-bar, diamond, pointer, or other patterns. Provides anti-slip performance and decorative value, commonly used for flooring, steps, vehicle bodies, and toolboxes. |
| 3105 Color-Coated Aluminum Coil/Sheet | Processed through continuous coating lines, with customizable colors and coatings. Suitable for building façades, roofing systems, signboards, and home-appliance housings. |
| 3105 Anodized Aluminum Sheet | Anodized to form a protective oxide layer that improves corrosion resistance and wear resistance while enhancing appearance. |
| 3105 Brushed Aluminum Sheet | Features a uniform metallic brushed texture with a refined appearance. Suitable for decorative panels, appliance panels, nameplates, and related products. |
| 3105 Stucco-Embossed Aluminum Sheet | Features orange-peel, bean-pattern, or other embossed textures that improve sheet rigidity and decorative performance. Commonly used for insulation cladding, packaging, and decorative materials. |
| 3105 Perforated Aluminum Sheet | Processed with round, square, slot-shaped, or other holes. Suitable for ceilings, curtain walls, ventilation panels, and decorative panels. |
| 3105 Laminated Aluminum Sheet | Covered with a protective or decorative film to prevent scratches during processing and transportation. It can also provide wood-grain, stone-grain, and other decorative effects. |
| 3105 Insulation Aluminum Sheet | Offers good corrosion resistance and processability. Commonly used for pipelines, tanks, equipment cladding, and building insulation projects. |
| 3105 Curtain Wall Aluminum Sheet | Can be processed by spraying, roller coating, perforating, bending, and other methods. Suitable for architectural curtain walls, façade decoration, and metal roofing systems. |
| 3105 Aluminum Strip | Can be slit to required widths for blinds, bottle-cap stock, nameplates, heat sinks, and various stamped components. |
In practical material selection, 3105 is often considered an upgraded alternative to 3003. Although both belong to the 3xxx alloy series, there are several key differences:
| Comparison Item | 3003 Aluminum Sheet | 3105 Aluminum Sheet |
| Strength Level | Baseline level | Slightly higher; Brinell hardness: 3003 H14 is 42 HB, while 3105 H24 is 47 HB |
| Fatigue Strength | 60 MPa | 74 MPa; better fatigue resistance |
| Electrical Conductivity | Approx. 40% IACS | 41% IACS; slightly higher |
| Chemical Composition | Lower magnesium content | Contains trace titanium, chromium, and copper, with more alloying elements |
| Formability | Excellent | Also excellent; some tempers, such as H24, offer better bending performance |
| Typical Applications | General-purpose parts, fuel tanks, radiators | Bottle caps, color-coated substrates, electrical enclosures, mobile-home panels |
Material Selection Recommendations
If you require higher electrical conductivity, strength, or bending performance after coating, 3105 is a better choice than 3003.
If cost is a primary concern and performance requirements are not demanding, 3003 remains an economical and reliable option.
Q1: What is the difference between 3003 H14 and 3105 H24?
A1: There are several differences between 3003 H14 and 3105 H24. One is Brinell hardness: 3003 H14 has a Brinell hardness of 42 BHN, while 3105 H24 has a Brinell hardness of 47 BHN. Another difference is fatigue strength: 3003 H14 has a fatigue strength of only 60 MPa, while 3105 H24 has a fatigue strength of 74 MPa.
In terms of alloy composition, 3003 H14 has a higher magnesium content than 3105 H24. However, 3105 H24 contains small amounts of titanium, chromium, and copper that are not present in 3003 H14.
Q2: What Is 3105 Pre-Painted Aluminum Sheet?
A2: 3105 pre-painted aluminum sheet is an alloy containing approximately 1.2% manganese. The addition of manganese gives it greater strength than pure aluminum. Pre-painted aluminum sheet is specially designed to form a hard and wear-resistant coating while maintaining the alloy’s flexibility for forming and fabrication.
3105 pre-painted aluminum sheet is commonly used for signs, mobile homes, residential siding, and sheet-metal fabrication.
Q3: How Is the Processability of 3105 Aluminum Sheet?
A3: 3105 aluminum sheet offers good processing performance. It is suitable for bending, stamping, roll forming, and other processes, and is less likely to crack. It is particularly suitable for continuous forming production lines.
Q4: Can 3105 Aluminum Sheet Be Customized?
A4: Yes. Customized thicknesses, widths, lengths, and surface treatments—including color coating, embossing, and brushing—are available according to customer requirements.
What Factors Affect the Price of 3105 Aluminum Sheet?
The main factors include aluminum ingot prices, alloy temper (H temper or O temper), thickness specifications, surface treatment method, and order quantity.
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