Aluminum 772.0-T6
Temper · default condition
AA 772.0 · UNS A07720
T6 = solution heat treated and artificially aged
Standard supplied condition when maximum strength and hardness are wanted from a 772.0 casting or tooling plate.
Values for the T6 condition
Other 772.0 tempers and conditions
772.0 is listed in 4 conditions; see the grade overview at 772.0.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Pick when the casting is machined soon after pouring and moderate strength with maximum dimensional stability is enough; Al-Zn-Mg self-ages at room temperature over weeks. | 145 | 220 | 5 | 65 HB | 32 % IACS |
Cooled from hot working and artificially aged | Low-distortion route: skips solution treatment/quench, so large tooling plates keep their shape while gaining useful strength. | 200 | 262 | 3 | 75 HB | 37 % IACS |
T6DefaultThis page Solution heat treated and artificially aged | Standard supplied condition when maximum strength and hardness are wanted from a 772.0 casting or tooling plate. | 250 | 331 | 8 | 85 HB | 35 % IACS |
Solution heat treated and overaged (stabilized) | Choose when long-term dimensional stability and reduced stress-corrosion sensitivity matter more than peak strength. | 250 | 300 | 5 | 85 HB | 40 % IACS |
What is 772.0-T6?
772.0-T6 is 772.0 in the T6 temper — standard supplied condition when maximum strength and hardness are wanted from a 772.0 casting or tooling plate. 772.0-T6 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 331 MPa (48 ksi) — stronger than 65% of aluminum grades. Elongation at break is 8% and the elastic modulus is 71 GPa (10.3 Msi). 772.0-T6 has a density of 2.81 g/cm³ (0.102 lb/in³), heavier than 86% of aluminum grades. It melts at 605°C (1,121 °F).
Advantages
- Easy to machine — 82/100, better than 94% of aluminum grades
- Polishes to a fine finish — 70/100, better than 87% of aluminum grades
772.0-T6 properties
Typical room-temperature values for 772.0-T6; 12 are specific to this condition. Other listed values are 772.0 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
772.0-T6 has a density of 2.81 g/cm³ (0.102 lb/in³), heavier than 86% of aluminum grades. It melts at 605°C (1,121 °F).
Mechanical13
772.0-T6 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 331 MPa (48 ksi) — stronger than 65% of aluminum grades. Elongation at break is 8% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
772.0-T6 is rated for continuous service to 150°C (302 °F). It conducts heat at 140 W/m·K (80.9 BTU/hr·ft·°F), worse than 52% of aluminum grades. Thermal expansion is 24 µm/m·K (13.3 µin/in·°F).
Electrical3
772.0-T6 conducts electricity at 35 % IACS, better than 52% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (43/100), worse than 65% of aluminum grades.
Sustainability4
Producing a kilogram of 772.0-T6 takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 20%.
Manufacturability8
772.0-T6's machinability is very good (82/100, better than 94% of aluminum grades); weldability fair (50/100); formability poor (15/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 772.0-T6
Is 772.0 easy to machine?
Machines very freely with a clean, chip-breaking cut and excellent surface finish — a main reason the alloy is chosen for jigs, gauges and mold plates; use sharp polished-flute carbide and flood coolant.
Can 772.0 be welded?
GTAW/GMAW possible with 5356 filler and the HAZ partly self-recovers by natural aging, but hot-tearing and post-weld SCC risk mean welding is best avoided on load-carrying tooling.
Can 772.0 be formed, bent or molded?
Sand and permanent-mold cast only; needs generous risering, chills and controlled cooling because of the wide freezing range and hot-tear tendency — no cold forming.
What surface finishes work on 772.0?
Takes clear/dyed sulfuric anodize reasonably uniformly, accepts chromate conversion coating and paint; polishing is good thanks to the low-silicon structure.
772.0 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 |
|---|---|---|
| Si | ≤ 0.15 | — |
| Fe | ≤ 0.15 | — |
| Cu | ≤ 0.1 | — |
| Mn | ≤ 0.1 | — |
| Mg | 0.6 – 0.8 | 0.7 |
| Cr | 0.06 – 0.2 | 0.13 |
| Zn | 6 – 7 | 6.5 |
| Tigrain refiner | 0.1 – 0.2 | 0.15 |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
772.0-T6 — frequently asked
What is 772.0-T6 used for?
772.0-T6 is typically used for tooling plates, pattern equipment and jigs and fixtures. In short: free-machining cast tooling alloy; dimensionally stable 77x.x variant; moderate corrosion resistance.
What is the yield strength of 772.0-T6?
772.0-T6 has a typical yield strength of 250 MPa (36.3 ksi) and a tensile strength of 331 MPa (48 ksi) — stronger than 65% of aluminum grades. Strength varies by condition: see the 4 listed tempers.
Is 772.0-T6 easy to machine?
Yes — machinability is rated very good (82/100, better than 94% of aluminum grades). Machines very freely with a clean, chip-breaking cut and excellent surface finish — a main reason the alloy is chosen for jigs, gauges and mold plates; use sharp polished-flute carbide and flood coolant.
Can 772.0-T6 be welded?
With care — weldability is rated fair (50/100). GTAW/GMAW possible with 5356 filler and the HAZ partly self-recovers by natural aging, but hot-tearing and post-weld SCC risk mean welding is best avoided on load-carrying tooling.
What surface finishes work on 772.0-T6?
Takes clear/dyed sulfuric anodize reasonably uniformly, accepts chromate conversion coating and paint; polishing is good thanks to the low-silicon structure.
Can 772.0-T6 be formed, bent or molded?
Sand and permanent-mold cast only; needs generous risering, chills and controlled cooling because of the wide freezing range and hot-tear tendency — no cold forming.
What is the maximum service temperature of 772.0-T6?
772.0-T6 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 772.0-T6 and 772.0-F?
T6 is the default condition — standard supplied condition when maximum strength and hardness are wanted from a 772.0 casting or tooling plate. F: pick when the casting is machined soon after pouring and moderate strength with maximum dimensional stability is enough; Al-Zn-Mg self-ages at room temperature over weeks. Yield strength is 250 MPa in T6 versus 145 MPa in F.
Sources
- 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)
- ASTM B26/B26M — Aluminum-Alloy Sand Castings — ASTM International (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)
- UNS A07720 alloy record — SAE/ASTM UNS (2020)
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.