Aluminum A206.0-T4
Temper · default condition
AA A206.0 · UNS A12060
T4 = solution heat treated and naturally aged
Pick for maximum ductility and fracture toughness with high strength — the standard condition for structural aerospace and armament castings.
Values for the T4 condition
Other A206.0 tempers and conditions
A206.0 is listed in 5 conditions; see the grade overview at A206.0.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Raw casting condition, used only as an intermediate before solution treatment; strength and ductility are low. | 110 | 195 | 6 | 55 HB | 38 % IACS |
T4DefaultThis page Solution heat treated and naturally aged | Pick for maximum ductility and fracture toughness with high strength — the standard condition for structural aerospace and armament castings. | 264 | 430 | 17 | 95 HB | 33 % IACS |
Solution heat treated and overaged (stabilized) | Pick for the highest yield strength combined with dimensional stability and improved resistance to stress-corrosion cracking. | 345 | 435 | 11.7 | 115 HB | 39 % IACS |
Solution heat treated and fully overaged for maximum stability | Pick when long-term dimensional stability, elevated-temperature service and best SCC resistance outweigh a modest strength loss versus T7. | 345 | 415 | 12 | 110 HB | 40 % IACS |
Solution heat treated and artificially aged | Occasionally specified where peak yield strength matters more than toughness and SCC risk is controlled. | 350 | 440 | 7 | 120 HB | 36 % IACS |
What is A206.0-T4?
A206.0-T4 is A206.0 in the T4 temper — pick for maximum ductility and fracture toughness with high strength — the standard condition for structural aerospace and armament castings. A206.0-T4 has a yield strength of 264 MPa (38.3 ksi) and a tensile strength of 430 MPa (62.4 ksi) — stronger than 68% of aluminum grades. Elongation at break is 17% and the elastic modulus is 71 GPa (10.3 Msi). A206.0-T4 has a density of 2.8 g/cm³ (0.101 lb/in³), heavier than 81% of aluminum grades. It melts at 570°C (1,058 °F).
Advantages
- Tough — resists crack growth — 36 MPa·√m (32.8 ksi·√in), better than 93% of aluminum grades
- Easy to machine — 78/100, better than 89% of aluminum grades
- Ductile — tolerates forming and impact — 17%, better than 85% of aluminum grades
Limitations
- Needs corrosion protection — 30/100, worse than 98% of aluminum grades
- Limited formability — 10/100, worse than 80% of aluminum grades
- Poor heat conductor — 121 W/m·K (69.9 BTU/hr·ft·°F), worse than 76% of aluminum grades
A206.0-T4 properties
Typical room-temperature values for A206.0-T4; 14 are specific to this condition. Other listed values are A206.0 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
A206.0-T4 has a density of 2.8 g/cm³ (0.101 lb/in³), heavier than 81% of aluminum grades. It melts at 570°C (1,058 °F).
Mechanical13
A206.0-T4 has a yield strength of 264 MPa (38.3 ksi) and a tensile strength of 430 MPa (62.4 ksi) — stronger than 68% of aluminum grades. Elongation at break is 17% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
A206.0-T4 is rated for continuous service to 150°C (302 °F). It conducts heat at 121 W/m·K (69.9 BTU/hr·ft·°F), worse than 76% of aluminum grades. Thermal expansion is 22.5 µm/m·K (12.5 µin/in·°F).
Electrical3
A206.0-T4 conducts electricity at 33 % IACS, worse than 57% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is poor (30/100), worse than 98% of aluminum grades.
Sustainability4
Producing a kilogram of A206.0-T4 takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 15%.
Manufacturability8
A206.0-T4's machinability is very good (78/100, better than 89% of aluminum grades); weldability poor (30/100); formability not recommended (10/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with A206.0-T4
Is A206.0 easy to machine?
Machines very well in T4/T7 with sharp carbide or PCD tools, high speeds and flood coolant; chips are continuous so use polished flutes and chip-breaking geometry.
Can A206.0 be welded?
Crack-sensitive Al-Cu chemistry — GTAW repair only with matching 206-type or 2319 filler, tight preheat/interpass control, and re-solution + re-age afterwards; not recommended for structural joints.
Can A206.0 be formed, bent or molded?
Sand and permanent-mold casting only; needs chills, generous risers, tight thermal-gradient control and low-turbulence gating to avoid hot tearing and shrink porosity; solution treatment near 525–530 °C requires close furnace control to avoid incipient melting.
What surface finishes work on A206.0?
Anodizing gives dull, less protective films because of the high copper — specify chromate conversion plus epoxy primer/paint, or nickel/cadmium plating, for corrosion protection; shot peening improves fatigue and SCC resistance.
A206.0 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 |
|---|---|---|
| SiA206.0 tightened vs 206.0 (0.10) | ≤ 0.05 | 0.03 |
| Felow Fe essential for toughness | ≤ 0.1 | 0.06 |
| Cu | 4.2 – 5 | 4.6 |
| Mn | 0.2 – 0.5 | 0.35 |
| Mg | 0.15 – 0.35 | 0.25 |
| Ni | ≤ 0.05 | — |
| Zn | ≤ 0.1 | — |
| Tigrain refinement | 0.15 – 0.3 | 0.22 |
| Sn | ≤ 0.05 | — |
| Others (each)total 0.15 max | ≤ 0.05 | — |
| Al | balance | — |
A206.0-T4 — frequently asked
What is A206.0-T4 used for?
A206.0-T4 is typically used for aerospace structural parts, automotive suspension components, high-strength machinery parts and military castings. In short: high-toughness Al-Cu casting; ductile structural cast alloy; poor corrosion resistance.
What is the yield strength of A206.0-T4?
A206.0-T4 has a typical yield strength of 264 MPa (38.3 ksi) and a tensile strength of 430 MPa (62.4 ksi) — stronger than 68% of aluminum grades. Strength varies by condition: see the 5 listed tempers.
Is A206.0-T4 easy to machine?
Yes — machinability is rated very good (78/100, better than 89% of aluminum grades). Machines very well in T4/T7 with sharp carbide or PCD tools, high speeds and flood coolant; chips are continuous so use polished flutes and chip-breaking geometry.
Can A206.0-T4 be welded?
Not readily — weldability is rated poor (30/100). Crack-sensitive Al-Cu chemistry — GTAW repair only with matching 206-type or 2319 filler, tight preheat/interpass control, and re-solution + re-age afterwards; not recommended for structural joints.
What surface finishes work on A206.0-T4?
Anodizing gives dull, less protective films because of the high copper — specify chromate conversion plus epoxy primer/paint, or nickel/cadmium plating, for corrosion protection; shot peening improves fatigue and SCC resistance.
Can A206.0-T4 be formed, bent or molded?
Sand and permanent-mold casting only; needs chills, generous risers, tight thermal-gradient control and low-turbulence gating to avoid hot tearing and shrink porosity; solution treatment near 525–530 °C requires close furnace control to avoid incipient melting.
What is the maximum service temperature of A206.0-T4?
A206.0-T4 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 A206.0-T4 and A206.0-F?
T4 is the default condition — pick for maximum ductility and fracture toughness with high strength — the standard condition for structural aerospace and armament castings. F: raw casting condition, used only as an intermediate before solution treatment; strength and ductility are low. Yield strength is 264 MPa in T4 versus 110 MPa in F.
Sources
- ASTM B26/B26M — Aluminum-Alloy Sand Castings — ASTM International (2018)
- ASTM B108/B108M — Aluminum-Alloy Permanent Mold Castings — ASTM International (2019)
- Registration Record of Aluminum Association Alloy Designations and Chemical Composition Limits for Aluminum Alloys in the Form of Castings and Ingot ('Pink Sheets') — The Aluminum Association (2018)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Specialty Handbook: Aluminum and Aluminum Alloys — ASM International (1993)
- AFS/NADCA foundry alloy property compilations for 206 alloys — American Foundry Society (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.