Aluminum 6105-O (Annealed)
Temper
AA 6105 · UNS A96105 · EN AW-6105
Softest condition, used only when profiles must be heavily bent or re-formed before ageing.
Values for the O condition
Other 6105 tempers and conditions
6105 is listed in 5 conditions; see the grade overview at 6105.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
OThis page Annealed | Softest condition, used only when profiles must be heavily bent or re-formed before ageing. | 55 | 110 | 25 | 30 HB | 52 % IACS |
Cooled from hot working and naturally aged | Choose when profiles must still be bent, punched or roll-formed after extrusion; strength is about 60 % of T5. | 97 | 152 | 16 | 47 HB | 44 % IACS |
Solution heat treated and naturally aged | Occasional order-temper for parts fabricated after solution treatment and later aged to T6; not a stock item. | 110 | 205 | 20 | 60 HB | 42 % IACS |
T5Default Cooled from hot working and artificially aged | Standard stocked condition for structural and architectural profiles needing ~240 MPa yield straight off the press line. | 241 | 262 | 10 | 76 HB | 47 % IACS |
Solution heat treated and artificially aged | Off-press-quench route used when maximum and most uniform strength through thick sections is required; rarely stocked for 6105. | 255 | 290 | 10 | 85 HB | 45 % IACS |
What is 6105-O?
6105-O is 6105 in the O temper — softest condition, used only when profiles must be heavily bent or re-formed before ageing. 6105-O has a yield strength of 55 MPa (7.98 ksi) and a tensile strength of 110 MPa (16 ksi) — weaker than 94% of aluminum grades. Elongation at break is 25% and the elastic modulus is 69 GPa (10 Msi). 6105-O has a density of 2.69 g/cm³ (0.0972 lb/in³), lighter than 67% of aluminum grades. It melts at 615°C (1,139 °F). T5 is the default condition FabDigit quotes; O is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 25%, better than 94% of aluminum grades
- Forms and bends easily — 90/100, better than 93% of aluminum grades
- High electrical conductivity — 52 % IACS, better than 91% of aluminum grades
- Conducts heat well — 195 W/m·K (112.7 BTU/hr·ft·°F), better than 90% of aluminum grades
- Polishes to a fine finish — 65/100, better than 82% of aluminum grades
Limitations
- Low strength — 55 MPa (7.98 ksi), worse than 94% of aluminum grades
- Difficult to machine — 30/100, worse than 92% of aluminum grades
6105-O properties
Typical room-temperature values for 6105-O; 10 are specific to this condition. Other listed values are 6105 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
6105-O has a density of 2.69 g/cm³ (0.0972 lb/in³), lighter than 67% of aluminum grades. It melts at 615°C (1,139 °F).
Mechanical12
6105-O has a yield strength of 55 MPa (7.98 ksi) and a tensile strength of 110 MPa (16 ksi) — weaker than 94% of aluminum grades. Elongation at break is 25% and the elastic modulus is 69 GPa (10 Msi).
Thermal6
6105-O is rated for continuous service to 150°C (302 °F). It conducts heat at 195 W/m·K (112.7 BTU/hr·ft·°F), better than 90% of aluminum grades. Thermal expansion is 23.4 µm/m·K (13 µin/in·°F).
Electrical3
6105-O conducts electricity at 52 % IACS, better than 91% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (68/100), better than 75% of aluminum grades.
Sustainability4
Producing a kilogram of 6105-O takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 35%.
Manufacturability8
6105-O's machinability is poor (30/100, worse than 92% of aluminum grades); weldability very good (75/100); formability excellent (90/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 6105-O
Is 6105 easy to machine?
Machines like 6061-T6 with sharp polished-flute carbide tools, high speed and flood or MQL lubrication; T1/O tempers gum up and give stringy chips.
Can 6105 be welded?
Readily GMAW/GTAW welded with 4043 (general) or 5356 (higher strength/anodizing match); expect HAZ strength to fall toward T4-level unless re-aged.
Can 6105 be formed, bent or molded?
Extrudes well at moderate press speeds; bend and punch in T1 and age to T5/T6 afterwards, since T5 profiles need generous bend radii (≥3t).
What surface finishes work on 6105?
Takes clear and colour anodize uniformly and accepts chromate/chrome-free conversion coats and powder coat; mechanical polishing gives a good but not mirror finish because of Mg2Si/Si particles.
6105 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 – 1 | 0.8 |
| Feimpurity limit | ≤ 0.35 | — |
| Cu | ≤ 0.1 | — |
| Mn | ≤ 0.15 | — |
| Mg | 0.45 – 0.8 | 0.62 |
| Cr | ≤ 0.1 | — |
| Zn | ≤ 0.1 | — |
| Ti | ≤ 0.1 | — |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
6105-O — frequently asked
What is 6105-O used for?
6105-O is typically used for architectural extrusions, railings, structural sections and ladders. In short: stronger than 6063; good anodizing response; general structural extrusion alloy.
What is the yield strength of 6105-O?
6105-O has a typical yield strength of 55 MPa (7.98 ksi) and a tensile strength of 110 MPa (16 ksi) — weaker than 94% of aluminum grades. Strength varies by condition: see the 5 listed tempers.
Is 6105-O easy to machine?
Not especially — machinability is rated poor (30/100, worse than 92% of aluminum grades). Machines like 6061-T6 with sharp polished-flute carbide tools, high speed and flood or MQL lubrication; T1/O tempers gum up and give stringy chips.
Can 6105-O be welded?
Yes — weldability is rated very good (75/100). Readily GMAW/GTAW welded with 4043 (general) or 5356 (higher strength/anodizing match); expect HAZ strength to fall toward T4-level unless re-aged.
What surface finishes work on 6105-O?
Takes clear and colour anodize uniformly and accepts chromate/chrome-free conversion coats and powder coat; mechanical polishing gives a good but not mirror finish because of Mg2Si/Si particles.
Can 6105-O be formed, bent or molded?
Extrudes well at moderate press speeds; bend and punch in T1 and age to T5/T6 afterwards, since T5 profiles need generous bend radii (≥3t).
What is the maximum service temperature of 6105-O?
6105-O 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.
What is the difference between 6105-T5 and 6105-O?
T5 is the default condition — standard stocked condition for structural and architectural profiles needing ~240 MPa yield straight off the press line. O: softest condition, used only when profiles must be heavily bent or re-formed before ageing. Yield strength is 241 MPa in T5 versus 55 MPa in O.
Sources
- ASTM B221 — Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles and Tubes — ASTM International (2021)
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum (Teal Sheets) — The Aluminum Association (2018)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- Aluminum Design Manual — The Aluminum Association (2020)
- EN 573-3 / EN 755-2 (EN AW-6105 designation and extruded product properties) — CEN (2019)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.