Aluminum 6360-T66
Precip hard
AA 6360 · UNS A96360 · EN AlSiMgMn
T66 = t6 with improved mechanical properties
Choose when EN-style architectural profiles must meet the higher T66 strength class without switching to 6005A/6082.
Values for the T66 condition
Other 6360 tempers and conditions
6360 is listed in 7 conditions; see the grade overview at 6360.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Fully softened condition for severe forming or for re-solution treatment; not a normal stock temper. | 50 | 105 | 27 | 28 HB | 58 % IACS |
Cooled from hot working and naturally aged | As-extruded press-quenched profile left to age at room temperature; used when maximum bendability/forming is needed before final ageing. | 70 | 130 | 20 | 45 HB | 50 % IACS |
Solution heat treated and naturally aged | Pick when profiles must be bent, roll-formed or stretch-formed before final artificial ageing to T6. | 90 | 160 | 20 | 52 HB | 46 % IACS |
Solution heat treated and under-aged | Under-aged compromise temper for profiles that still need appreciable bending/crimping after ageing. | 125 | 185 | 14 | 62 HB | 50 % IACS |
Cooled from hot working and artificially aged | Highest-productivity route: press-quench plus ageing oven — the standard temper for architectural window/door and trim profiles. | 155 | 195 | 10 | 65 HB | 55 % IACS |
T6Default Solution heat treated and artificially aged | Default stocked condition: full peak-aged strength with retained bright anodizing quality for load-bearing architectural and industrial profiles. | 190 | 230 | 11 | 75 HB | 53 % IACS |
T66This page T6 with improved mechanical properties | Choose when EN-style architectural profiles must meet the higher T66 strength class without switching to 6005A/6082. | 210 | 250 | 9 | 82 HB | 52 % IACS |
What is 6360-T66?
6360-T66 is 6360 in the T66 condition — choose when EN-style architectural profiles must meet the higher T66 strength class without switching to 6005A/6082. 6360-T66 has a yield strength of 210 MPa (30.5 ksi) and a tensile strength of 250 MPa (36.3 ksi) — stronger than 56% of aluminum grades. Elongation at break is 9% and the elastic modulus is 69 GPa (10 Msi). 6360-T66 has a density of 2.7 g/cm³ (0.0975 lb/in³), lighter than 59% of aluminum grades. It melts at 600°C (1,112 °F). T6 is the default condition FabDigit quotes; T66 is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 80/100, better than 93% of aluminum grades
- High electrical conductivity — 52 % IACS, better than 91% of aluminum grades
- Conducts heat well — 198 W/m·K (114.4 BTU/hr·ft·°F), better than 90% of aluminum grades
- Good corrosion resistance — 72/100, better than 83% of aluminum grades
- Readily welded — 85/100, better than 79% of aluminum grades
6360-T66 properties
Typical room-temperature values for 6360-T66; 12 are specific to this condition. Other listed values are 6360 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
6360-T66 has a density of 2.7 g/cm³ (0.0975 lb/in³), lighter than 59% of aluminum grades. It melts at 600°C (1,112 °F).
Mechanical13
6360-T66 has a yield strength of 210 MPa (30.5 ksi) and a tensile strength of 250 MPa (36.3 ksi) — stronger than 56% of aluminum grades. Elongation at break is 9% and the elastic modulus is 69 GPa (10 Msi).
Thermal6
6360-T66 is rated for continuous service to 150°C (302 °F). It conducts heat at 198 W/m·K (114.4 BTU/hr·ft·°F), better than 90% of aluminum grades. Thermal expansion is 23.4 µm/m·K (13 µin/in·°F).
Electrical3
6360-T66 conducts electricity at 52 % IACS, better than 91% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), better than 83% of aluminum grades.
Sustainability4
Producing a kilogram of 6360-T66 takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 40%.
Manufacturability8
6360-T66's machinability is good (58/100, worse than 54% of aluminum grades); weldability excellent (85/100); formability fair (52/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 6360-T66
Is 6360 easy to machine?
Machines easily in T5/T6 with sharp polished-flute carbide, high speed and generous coolant/lubricant; T4 and O are gummy and prone to built-up edge.
Can 6360 be welded?
Readily GMAW/GTAW welded with 4043 (crack-safe) or 5356 (stronger, better anodizing colour match); HAZ drops to near-T4 strength unless post-weld aged.
Can 6360 be formed, bent or molded?
Designed for very high extrusion exit speeds and thin architectural sections; bend and roll-form in T1/T4/T64, avoid tight radii in T6/T66.
What surface finishes work on 6360?
Excellent for clear, bright and colour architectural anodizing (Class I/II), plus chromate-free pretreatment with powder coating; polishes to a uniform lustre with little streaking.
6360 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 |
|---|---|---|
| Siraised vs 6060 to support high extrusion speed | 0.35 – 0.8 | 0.55 |
| Fecontrolled low Fe for anodizing brightness | 0.1 – 0.3 | 0.2 |
| Cu | ≤ 0.15 | 0.02 |
| Mngrain/recrystallisation control | 0.02 – 0.15 | 0.06 |
| Mg | 0.35 – 0.7 | 0.5 |
| Cr | ≤ 0.05 | — |
| Zn | ≤ 0.15 | — |
| Tigrain refiner | ≤ 0.1 | 0.02 |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
6360-T66 — frequently asked
What is 6360-T66 used for?
6360-T66 is typically used for architectural extrusions, window and door profiles and curtain wall sections. In short: high-speed extrusion alloy; anodizing-quality architectural grade; higher output than 6063.
What is the yield strength of 6360-T66?
6360-T66 has a typical yield strength of 210 MPa (30.5 ksi) and a tensile strength of 250 MPa (36.3 ksi) — stronger than 56% of aluminum grades. Strength varies by condition: see the 7 listed tempers.
Is 6360-T66 easy to machine?
Reasonably — machinability is rated good (58/100, worse than 54% of aluminum grades). Machines easily in T5/T6 with sharp polished-flute carbide, high speed and generous coolant/lubricant; T4 and O are gummy and prone to built-up edge.
Can 6360-T66 be welded?
Yes — weldability is rated excellent (85/100). Readily GMAW/GTAW welded with 4043 (crack-safe) or 5356 (stronger, better anodizing colour match); HAZ drops to near-T4 strength unless post-weld aged.
What surface finishes work on 6360-T66?
Excellent for clear, bright and colour architectural anodizing (Class I/II), plus chromate-free pretreatment with powder coating; polishes to a uniform lustre with little streaking.
Can 6360-T66 be formed, bent or molded?
Designed for very high extrusion exit speeds and thin architectural sections; bend and roll-form in T1/T4/T64, avoid tight radii in T6/T66.
What is the maximum service temperature of 6360-T66?
6360-T66 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 6360-T6 and 6360-O?
T6 is the default condition — default stocked condition: full peak-aged strength with retained bright anodizing quality for load-bearing architectural and industrial profiles. O: fully softened condition for severe forming or for re-solution treatment; not a normal stock temper. Yield strength is 190 MPa in T6 versus 50 MPa in O.
Sources
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum (Teal Sheets) — The Aluminum Association (2018)
- EN 755-2 Aluminium and aluminium alloys — Extruded rod/bar, tube and profiles: mechanical properties — CEN (2016)
- EN 12020-2 Precision profiles in EN AW-6060 and EN AW-6063 — CEN (2016)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- High-speed extrusion alloys for architectural profiles (6060/6063/6360 class) — Hydro Extrusion / Constellium (2022)
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.