Aluminum 3105
AA 3105 · UNS A93105 · EN AW-3105, AW 3105 · ISO N31
3105 is a lightly alloyed Al–Mn–Mg sheet alloy (Mn 0.3–0.8 %, Mg 0.2–0.8 %) that is slightly stronger than 3003 while keeping excellent formability, corrosion resistance and coil-coating behaviour.
3105 tempers and conditions
3105 is supplied in 14 conditions, soft to hard.
Compare all 14 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick for deep drawing, spinning or severe roll forming where maximum ductility is required. | 55 | 115 | 24 | 28 HB | 43 % IACS |
Slightly strain hardened | Near-annealed 3105 sheet with only incidental work hardening from flattening/handling — softest usable formable temper with high ductility. | 55 | 125 | 22 | 33 HB | 42 % IACS |
Strain hardened and partially annealed, quarter hard | European roofing/rainware temper: quarter-hard strength with restored bend ductility. | 120 | 150 | 6 | 42 HB | 41 % IACS |
Strain hardened, quarter hard | Light temper for parts that still need bending but more stiffness than O. | 130 | 150 | 7 | 40 HB | 41 % IACS |
Strain hardened and stabilized, half hard | Stabilized half-hard sheet specified when age-softening of the Mg-bearing alloy must be avoided. | 145 | 170 | 6 | 47 HB | 41 % IACS |
Strain hardened and partially annealed, half hard | Most common coil-coated building-sheet temper in Europe/Asia: half-hard with good roll-forming ductility. | 145 | 170 | 5 | 48 HB | 41 % IACS |
Strain hardened, half hard | General-purpose half-hard sheet for stamped covers, trim and formed panels. | 150 | 170 | 5 | 46 HB | 41 % IACS |
Strain hardened and partially annealed, between half and three-quarter… | The classic North-American 3105 siding/gutter/trim temper — best balance of strength, roll formability and paint-line behaviour. | 160 | 180 | 8 | 48 HB | 41 % IACS |
Strain hardened and partially annealed, three-quarter hard | Higher-strength stabilized coil for panels needing dent resistance with moderate forming. | 165 | 190 | 4 | 53 HB | 41 % IACS |
Strain hardened, three-quarter hard | Choose for flat panels and shallow-formed parts needing higher stiffness and dent resistance. | 175 | 195 | 4 | 52 HB | 41 % IACS |
Strain hardened and partially annealed, full hard | Stiffest stabilized 3105 coil; use only for flat or lightly bent parts. | 185 | 205 | 3 | 57 HB | 41 % IACS |
Strain hardened and stabilized, full hard | Stabilized full-hard thin strip for caps, closures and flat blanked parts. | 190 | 215 | 3 | 58 HB | 41 % IACS |
Strain hardened, full hard | Maximum-strength condition for flat blanks, caps and shims with minimal forming. | 195 | 215 | 3 | 57 HB | 41 % IACS |
Strain hardened, extra hard | Extra-hard cold-rolled 3105 above full-hard H18 — maximum strength and springiness with minimal ductility, used for thin coil/fin and roll-formed profiles. | 215 | 230 | 1.5 | 63 HB | 41 % IACS |
What is 3105?
3105 is a lightly alloyed Al–Mn–Mg sheet alloy (Mn 0.3–0.8 %, Mg 0.2–0.8 %) that is slightly stronger than 3003 while keeping excellent formability, corrosion resistance and coil-coating behaviour. It is supplied almost exclusively as thin sheet/coil in H-tempers for building products — siding, roofing, gutters, downspouts, mobile-home and trim stock, bottle caps and stamped hardware. It is not heat-treatable, strength is modest (max ~215 MPa), it is not a structural or high-temperature alloy, and clear anodizing gives a dull grey rather than a bright finish. 3105 has a density of 2.72 g/cm³ (0.0983 lb/in³), heavier than 57% of aluminum grades. It melts at 635°C (1,175 °F). 3105 has a yield strength of 160 MPa (23.2 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 61% of aluminum grades. Elongation at break is 8% and the elastic modulus is 69 GPa (10 Msi).
What is 3105 used for?
- Roofing panels
- Siding
- Sign blanks
Advantages
- Conducts heat well — 172 W/m·K (99.4 BTU/hr·ft·°F), better than 84% of aluminum grades
- Forms and bends easily — 70/100, better than 83% of aluminum grades
- Readily welded — 85/100, better than 79% of aluminum grades
- High electrical conductivity — 41 % IACS, better than 78% of aluminum grades
- Good corrosion resistance — 68/100, better than 75% of aluminum grades
Limitations
- Difficult to machine — 42/100, worse than 77% of aluminum grades
- Hard to polish — 45/100, worse than 76% of aluminum grades
3105 properties
Typical room-temperature values; bars are the position among aluminum grades.
Physical3
3105 has a density of 2.72 g/cm³ (0.0983 lb/in³), heavier than 57% of aluminum grades. It melts at 635°C (1,175 °F).
Mechanical10
3105 has a yield strength of 160 MPa (23.2 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 61% of aluminum grades. Elongation at break is 8% and the elastic modulus is 69 GPa (10 Msi).
Thermal6
3105 is rated for continuous service to 150°C (302 °F). It conducts heat at 172 W/m·K (99.4 BTU/hr·ft·°F), better than 84% of aluminum grades. Thermal expansion is 23.6 µm/m·K (13.1 µin/in·°F).
Electrical3
3105 conducts electricity at 41 % IACS, better than 78% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (68/100), better than 75% of aluminum grades.
Sustainability4
Producing a kilogram of 3105 takes about 200 MJ of energy and emits 12 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 40%.
Manufacturability7
3105's machinability is fair (42/100, worse than 77% of aluminum grades); weldability excellent (85/100); formability very good (70/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the aluminum family
Yield strength against density for every aluminum grade FabDigit runs. 3105 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 3105
Is 3105 easy to machine?
Soft and gummy — use polished high-rake carbide, high surface speed and flood lubrication to avoid built-up edge; blanking and shearing are preferred over milling for thin coil.
Can 3105 be welded?
Readily GTAW/GMAW/resistance welded with 4043 or 5356 filler (5356 for better colour match after anodizing); HAZ reverts toward O strength, so joints lose H-temper properties.
Can 3105 be formed, bent or molded?
Excellent roll forming, bending and stamping in O/H2x tempers; H14–H18 need generous bend radii and grain-direction control to avoid edge cracking.
Manufacturability
The process limits FabDigit applies to 3105. Every 3105 part is priced by an engineer; design inside these and the quote comes back without a redesign loop.
Sheet metal
| Formability | Better70 / 100 |
|---|---|
| Weldability | Better85 / 100 |
| Bendable | Yes |
| Minimum bend radius | 0.5× thickness |
| Spring-back | Low |
| Welding processes | MIG, TIG, SPOT, LASER |
3105 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Si | ≤ 0.6 | 0.3 |
| Fe | ≤ 0.7 | 0.45 |
| Cu | ≤ 0.3 | 0.1 |
| Mn | 0.3 – 0.8 | 0.55 |
| Mg | 0.2 – 0.8 | 0.5 |
| Cr | ≤ 0.2 | 0.05 |
| Zn | ≤ 0.4 | 0.1 |
| Ti | ≤ 0.1 | 0.02 |
| Others (each)0.15 total | ≤ 0.05 | |
| Al | balance |
What surface finishes work on 3105?
Ideal substrate for coil coating and PVDF/polyester paint after chromate-free pretreatment; clear anodizing gives a dull grey, so anodize only for protection, not appearance.
Surface treatments FabDigit runs on aluminum parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Equivalent designations
Standards and trade names that resolve to Aluminum 3105 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- A93105
- Aluminum Association
- AA3105
- EN / DIN / Werkstoff-Nr.
- AW-3105AW 3105AlMn0.5Mg0.53.0505
- ISO
- N31
How much does 3105 cost?
3105 is a budget-cost aluminum ($), cheaper than about 99% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
3105 — frequently asked
What is 3105 used for?
3105 is typically used for roofing panels, siding and sign blanks. In short: budget-friendly; easy shaping.
What is the yield strength of 3105?
3105 has a typical yield strength of 160 MPa (23.2 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 61% of aluminum grades. Strength varies by condition: see the 14 listed tempers.
Is 3105 easy to machine?
Not especially — machinability is rated fair (42/100, worse than 77% of aluminum grades). Soft and gummy — use polished high-rake carbide, high surface speed and flood lubrication to avoid built-up edge; blanking and shearing are preferred over milling for thin coil.
Can 3105 be welded?
Yes — weldability is rated excellent (85/100). Readily GTAW/GMAW/resistance welded with 4043 or 5356 filler (5356 for better colour match after anodizing); HAZ reverts toward O strength, so joints lose H-temper properties.
What surface finishes work on 3105?
Ideal substrate for coil coating and PVDF/polyester paint after chromate-free pretreatment; clear anodizing gives a dull grey, so anodize only for protection, not appearance.
Can 3105 be formed, bent or molded?
Excellent roll forming, bending and stamping in O/H2x tempers; H14–H18 need generous bend radii and grain-direction control to avoid edge cracking.
What is the maximum service temperature of 3105?
3105 is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 3105 cost?
3105 is a budget-cost aluminum ($), cheaper than about 99% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Can FabDigit make parts in 3105?
Yes — 3105 is available for sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum (Teal Sheets) — The Aluminum Association (2018)
- ASTM B209 / B209M — Aluminum and Aluminum-Alloy Sheet and Plate — ASTM International (2021)
- EN 485-2 — Aluminium and aluminium alloys, sheet, strip and plate: mechanical properties — CEN (2016)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Aluminum Design Manual — The Aluminum Association (2020)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.