H24 / H25
Strain-hardened then partially annealed (or stabilised during paint curing). The usual choice for pre-painted siding, gutters and roll-formed profiles because the extra elongation protects the paint at bends.
Painting and roll-forming sheet
3105 Aluminium Sheet & Coil
3105 is an aluminium-manganese-magnesium alloy made for coil coating, roll forming and stamping: a little stronger than 3003, very formable and the standard base metal for pre-painted building products and screw caps. Metline supplies 3105 sheet and coil in mill finish, embossed and pre-painted PE or PVDF, slit or cut to length, certified to ASTM B209 or EN 485, worldwide.
- Alloy
- 3105 (Al-Mn-Mg)
- Tempers
- O, H12 – H18, H22 – H28
- Thickness
- 0.2 – 6 mm (to 10 mm on request)
- Finishes
- Mill, embossed, PE / PVDF painted
What is 3105 aluminium sheet?
3105 contains about 0.3 – 0.8 % manganese and 0.2 – 0.8 % magnesium. The two elements together give strength slightly above 3003 at lower total alloy content, and the alloy can tolerate higher levels of recycled scrap, which helps keep its cost down. It is non-heat-treatable and is strengthened by cold rolling.
Most 3105 is sold as coil, either bare for customers who paint or laminate in their own lines, or coil-coated with polyester (PE), silicone-modified polyester or PVDF paint. Pre-painted 3105 is roll-formed into residential siding, soffits, gutters and downpipes, garage doors, mobile-home and trailer skins, and sign blanks. Thin 3105 strip in H14 to H19 tempers is also a major closure alloy for pilfer-proof screw caps on bottles.
Because the alloy work-hardens moderately and has good elongation in the H2x tempers, it survives the tight bends of roll-formed profiles and hemmed edges without cracking the paint film, provided the temper and coating are matched to the forming process.
3105 chemical composition (wt %)
| Element | Minimum | Maximum | Role |
|---|---|---|---|
| Silicon (Si) | — | 0.6 | Impurity |
| Iron (Fe) | — | 0.7 | Impurity |
| Copper (Cu) | — | 0.30 | |
| Manganese (Mn) | 0.30 | 0.8 | Strength and grain control |
| Magnesium (Mg) | 0.20 | 0.8 | Solid-solution strengthening |
| Chromium (Cr) | — | 0.20 | |
| Zinc (Zn) | — | 0.40 | |
| Titanium (Ti) | — | 0.10 | |
| Others, each / total | — | 0.05 / 0.15 | |
| Aluminium (Al) | Remainder |
Aluminum Association limits per ASTM B209; EN AW-3105 (EN 573-3) is the same alloy. Each lot is certified with its actual analysis.
3105 mechanical properties by temper
Typical values from published Aluminum Association / ASM data are shown first, followed by the specified limits in ASTM B209 for the most common tempers. Note that B209 sets a tensile range (minimum and maximum) for these tempers, which keeps forming behaviour consistent from coil to coil.
| Temper | Tensile strength (typical) | Yield strength (typical) | Elongation (typical) |
|---|---|---|---|
| 3105-O | 117 MPa / 17 ksi | 55 MPa / 8 ksi | 24 % |
| 3105-H12 | 152 MPa / 22 ksi | 131 MPa / 19 ksi | 7 % |
| 3105-H14 | 172 MPa / 25 ksi | 152 MPa / 22 ksi | 5 % |
| 3105-H16 | 193 MPa / 28 ksi | 172 MPa / 25 ksi | 4 % |
| 3105-H18 | 214 MPa / 31 ksi | 193 MPa / 28 ksi | 3 % |
| 3105-H25 | 179 MPa / 26 ksi | 159 MPa / 23 ksi | 8 % |
| Temper (ASTM B209) | Tensile strength range | Yield strength, min. | Elongation, min. (by thickness) |
|---|---|---|---|
| O, 0.33 – 2.0 mm | 97 – 145 MPa (14 – 21 ksi) | 34 MPa (5 ksi) | 16 – 20 % |
| H12, 0.43 – 2.0 mm | 131 – 179 MPa (19 – 26 ksi) | 103 MPa (15 ksi) | 1 – 3 % |
| H14, 0.33 – 2.0 mm | 152 – 200 MPa (22 – 29 ksi) | 124 MPa (18 ksi) | 1 – 2 % |
Thickness bands converted from the inch tables in ASTM B209; elongation minimums rise with thickness. The certificate reports the tested values for each coil.
Physical properties (typical)
- Density
- 2.72 g/cm³ (0.098 lb/in³)
- Modulus of elasticity
- 69 GPa
- Thermal conductivity
- about 170 W/m·K
- Electrical conductivity
- about 45 % IACS
- Coefficient of thermal expansion
- about 22 – 23 µm/m·°C (20 – 100 °C)
- Specific heat
- about 900 J/kg·K
- Melting range
- about 635 – 655 °C
Choosing a 3105 temper
H14 / H16
Strain-hardened only. Stiffer, flatter panels and sign blanks; slightly less formable than H24 / H26.
H18 / H19
Full hard. Thin closure stock and flat parts with no forming.
O
Soft for deep drawing and stamping, then usually painted after forming.
Paint-cure effect
Coil coating ovens reach roughly 230 – 250 °C metal temperature, which softens hard tempers slightly. Mills therefore supply H1x substrate that ends up near H2x properties after coating; specify the final temper you need.
Not sure?
Describe your roll-forming or bending process and the tightest radius, and we will suggest a temper and coating combination.
Mill finish, embossed and pre-painted 3105
Mill finish
Bare sheet and coil for painting, laminating or anodising in your own line. Specify surface quality, flatness and degreasing or chemical pre-treatment requirements.
Stucco embossed
An irregular embossed texture that stiffens thin sheet and hides handling marks. Widely used for insulation jacketing on pipes and tanks.
Pre-painted PE
Polyester coatings around 18 – 25 µm for interior use, signs and cost-sensitive exterior products.
Pre-painted PVDF
Fluoropolymer coatings, usually two or three coats, for long-life exterior cladding with high colour and gloss retention.
Tread pattern
Five-bar and diamond patterns for steps, light floors and protective panels where low weight matters more than load capacity.
Protective film
Peelable film for transport and forming, recommended for visible panels.
For coated sheet, the specification should cover the coating system (PE, SMP or PVDF), dry film thickness on the face and reverse, colour reference (RAL, NCS or customer sample) and permitted colour difference (ΔE), gloss level and any test requirements such as T-bend, impact or salt-spray performance. Colours seen on a screen are only indicative; approve a physical panel before bulk production.
3105 standards and equivalents
| System | Designation | Standard |
|---|---|---|
| Aluminum Association / ASTM | 3105 | ASTM B209 (ASME SB-209) |
| UNS | A93105 | — |
| European (EN) | EN AW-3105 / AlMn0.5Mg0.5 | EN 485-2, EN 573-3; EN 1396 for coil-coated sheet |
| German Werkstoff | 3.0505 | DIN EN 485 |
| Japan (JIS) | A3105P | JIS H4000 |
| China (GB) | 3105 | GB/T 3880, GB/T 3190 |
Pre-painted sheet is commonly tested to EN 13523 (coil coating test methods) or ASTM D-series methods for film thickness, adhesion, flexibility and weathering. Tell us which applies.
3105 sheet and coil supply range and weights
Supply range
- Thickness
- 0.2 – 6 mm standard; up to 10 mm on request
- Width
- Coil and sheet from about 100 mm slit width up to about 1600 mm
- Sheet sizes
- 1000 × 2000, 1220 × 2440, 1250 × 2500 mm; 48 × 96 and 48 × 120 in
- Coil
- Inside diameter 405, 505 or 508 mm; coil weight to suit your decoiler
- Processing
- Slitting, cut-to-length levelling, blanking, shearing
3105 weighs about 2.72 kg per m² per millimetre. A 0.040 in (1.02 mm) sheet of 48 × 96 in weighs about 8.3 kg (18.2 lb); paint adds only a few grams per square metre.
| Thickness (mm) | kg per m² | 1220 × 2440 mm (kg) | 1500 × 3000 mm (kg) |
|---|---|---|---|
| 0.3 | 0.82 | 2.4 | 3.7 |
| 0.4 | 1.09 | 3.2 | 4.9 |
| 0.5 | 1.36 | 4.0 | 6.1 |
| 0.6 | 1.63 | 4.9 | 7.3 |
| 0.7 | 1.90 | 5.7 | 8.6 |
| 0.8 | 2.18 | 6.5 | 9.8 |
| 1 | 2.72 | 8.1 | 12.2 |
| 1.2 | 3.26 | 9.7 | 14.7 |
| 1.5 | 4.08 | 12.1 | 18.4 |
| 2 | 5.44 | 16.2 | 24.5 |
| 2.5 | 6.80 | 20.2 | 30.6 |
| 3 | 8.16 | 24.3 | 36.7 |
| 4 | 10.9 | 32.4 | 49.0 |
| 5 | 13.6 | 40.5 | 61.2 |
| 6 | 16.3 | 48.6 | 73.4 |
Forming, joining and handling 3105
Roll forming and bending
H24 / H25 accepts tight bends and hems. For painted sheet, check the coating's T-bend rating against your tightest bend and form at room temperature or above.
Stamping and drawing
O and H2x tempers stamp well; closure stock in H14 – H19 is formed in high-speed presses with controlled earing.
Joining
Weldable by TIG and MIG with ER4043 or ER1100, but welding damages paint. Painted panels are normally riveted, screwed, clinched or bonded.
Handling
Use protective film on visible panels, store dry and avoid condensation between sheets, which causes water staining on mill finish.
Applications of 3105 sheet and coil
- Building products: siding, soffit, fascia, gutters, downpipes, roofing and corrugated sheet
- Doors and shutters: garage-door panels and roller-shutter slats
- Transport: trailer, RV and mobile-home skins and linings
- Insulation jacketing: stucco-embossed sheet for pipes, tanks and vessels
- Closures: screw caps and pilfer-proof closures for drinks and pharmaceuticals
- Signs and fabrication: sign blanks, decorative panels, lamp parts and louvres
If you need higher strength for cladding spans or better corrosion resistance near the sea, consider 3004 or 5005; for painted trailer panels exposed to heavy impact, 5052 is a common upgrade.
3105 compared with 3003 and 5005
| Property | 3003-H14 | 3105-H14 | 5005-H14 |
|---|---|---|---|
| Typical tensile strength | about 152 MPa | about 172 MPa | about 159 MPa |
| Formability | Excellent | Very good | Very good |
| Paint / coil-coat response | Good | Excellent | Good |
| Decorative anodising | Fair | Fair | Excellent |
| Typical market | General sheet metal, tanks | Pre-painted building products, caps | Architectural anodised panels |
In practice, 3105 is the economical choice for painted sheet, 3003 for bare fabricated parts and brazed products, and 5005 when an anodised appearance matters.
How to order 3105 sheet and coil
- SpecifyTemper, thickness, width, sheet length or coil ID and weight, surface (mill, embossed or painted), coating system, colour code, film and quantity, plus the standard (ASTM B209 or EN 485).
- QuoteWe confirm availability, tolerances, certification, packing and delivery terms (EXW, FOB, CIF or DAP) for your destination.
- ProcessCoils are slit or cut to length, film applied where required, and inspected for dimensions, flatness and coating.
- DocumentEach delivery carries a mill test certificate to EN 10204 3.1 with the cast analysis and mechanical results for the lot; third-party inspection can be arranged on request.
- ShipSheets are interleaved or film-protected, packed on pallets or in seaworthy wooden cases, and shipped by sea or air to your port or door.
References and standards
- ASTM B209 – Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate
- EN 573-3 – Aluminium and aluminium alloys: chemical composition and form of wrought products
- EN 485-2 – Aluminium and aluminium alloys: sheet, strip and plate, mechanical properties
- EN 1396 – Aluminium and aluminium alloys: coil-coated sheet and strip for general applications
- EN 13523 – Coil coated metals: test methods
3105 aluminium (aluminum) sheet: frequently asked questions
What is 3105 aluminium used for?
Mainly pre-painted building products (siding, gutters, soffits), trailer and mobile-home panels, insulation jacketing, signs and screw-cap closures.
What is the difference between 3105 and 3003?
3105 contains magnesium as well as manganese and is slightly stronger; it is optimised for painting and roll forming. 3003 has more manganese and is preferred for bare fabricated parts, tanks and brazed products.
Which temper is best for painted gutters and siding?
H24 or H25, which combine adequate stiffness with enough elongation to roll-form tight profiles without cracking the paint.
PE or PVDF coating: which should I choose?
PE is economical for interior and moderate exterior use. PVDF gives much better colour and gloss retention for long-life exterior cladding.
Can 3105 be anodised?
It can, but the result is not as uniform as 5005; 3105 is chosen for painting rather than decorative anodising.
Do you supply 3105 slit coil?
Yes. We supply slit coil to your width and coil ID, or cut-to-length sheets, packed for export.
Need 3105 sheet or pre-painted coil?
Send temper, size, finish or colour, quantity and destination. We will reply with availability and a delivered price.
