Aluminum 7022-T651
Temper · default condition
AA 7022 · EN AlZn5Mg3Cu, 3.4345
T651 = t6, stress relieved by stretching
Default stocked condition for thick plate and tooling/mould plate — peak strength with low residual stress so heavily machined parts stay flat.
Values for the T651 condition
Other 7022 tempers and conditions
7022 is listed in 5 conditions; see the grade overview at 7022.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick for maximum formability or as an intermediate condition before solution treatment; strength is low and must be restored by T6 ageing. | 120 | 240 | 15 | 68 HB | 39 % IACS |
Solution heat treated and artificially aged | Standard peak-aged condition for extrusions, bar and forgings when maximum static strength is required and residual stress is not critical. | 460 | 520 | 8 | 148 HB | 32 % IACS |
Solution treated, stress-relieved by stretching, aged; no further… | Choose for extrusions and drawn bar that will be CNC-machined asymmetrically — stretched stress relief with no post-straightening keeps distortion minimal. | 465 | 520 | 8 | 149 HB | 32 % IACS |
T6, stress relieved by stretching, minor straightening | Same as T6510 but with a small straightening allowance, so it is the usual supply condition for long extruded profiles and rod with tight straightness limits. | 465 | 520 | 8 | 149 HB | 32 % IACS |
T651DefaultThis page T6, stress relieved by stretching | Default stocked condition for thick plate and tooling/mould plate — peak strength with low residual stress so heavily machined parts stay flat. | 470 | 530 | 8 | 150 HB | 32 % IACS |
What is 7022-T651?
7022-T651 is 7022 in the T651 temper — default stocked condition for thick plate and tooling/mould plate — peak strength with low residual stress so heavily machined parts stay flat. 7022-T651 has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 530 MPa (76.9 ksi) — stronger than 93% of aluminum grades. Elongation at break is 8% and the elastic modulus is 70 GPa (10.2 Msi). 7022-T651 has a density of 2.78 g/cm³ (0.1 lb/in³), heavier than 74% of aluminum grades. It melts at 475°C (887 °F).
Advantages
- High strength — 470 MPa (68.2 ksi), better than 93% of aluminum grades
- Polishes to a fine finish — 72/100, better than 89% of aluminum grades
- Easy to machine — 75/100, better than 86% of aluminum grades
Limitations
- Difficult to weld — 20/100, worse than 89% of aluminum grades
- Limited service temperature — 120°C (248 °F), worse than 79% of aluminum grades
7022-T651 properties
Typical room-temperature values for 7022-T651; 16 are specific to this condition. Other listed values are 7022 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
7022-T651 has a density of 2.78 g/cm³ (0.1 lb/in³), heavier than 74% of aluminum grades. It melts at 475°C (887 °F).
Mechanical15
7022-T651 has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 530 MPa (76.9 ksi) — stronger than 93% of aluminum grades. Elongation at break is 8% and the elastic modulus is 70 GPa (10.2 Msi).
Thermal6
7022-T651 is rated for continuous service to 120°C (248 °F). It conducts heat at 145 W/m·K (83.8 BTU/hr·ft·°F), better than 53% of aluminum grades. Thermal expansion is 23.5 µm/m·K (13.1 µin/in·°F).
Electrical3
7022-T651 conducts electricity at 32 % IACS, worse than 63% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 62% of aluminum grades.
Sustainability4
Producing a kilogram of 7022-T651 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
7022-T651's machinability is very good (75/100, better than 86% of aluminum grades); weldability poor (20/100); formability poor (22/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 7022-T651
Is 7022 easy to machine?
Machines very freely in T6/T651 with sharp polished-flute carbide, high speed and copious coolant; chips are short and surfaces take a fine finish.
Can 7022 be welded?
Not recommended for fusion welding because of the Cu content (hot cracking and severe HAZ loss); use mechanical fastening, adhesive bonding or friction stir where qualified.
Can 7022 be formed, bent or molded?
Form in the O or freshly solution-treated condition — T6/T651 material has low ductility and generous bend radii are mandatory; hot forge above ~400 °C.
What surface finishes work on 7022?
Responds well to hard and sulphuric anodising (slightly grey tone), chromate/chrome-free conversion coating and paint; polish before anodising for mould surfaces.
7022 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 | ≤ 0.5 | 0.15 |
| Fe | ≤ 0.5 | 0.25 |
| Cu | 0.5 – 1 | 0.75 |
| Mn | 0.1 – 0.4 | 0.25 |
| Mg | 2.6 – 3.7 | 3.1 |
| Cr | 0.1 – 0.3 | 0.2 |
| Zn | 4.3 – 5.2 | 4.8 |
| TiTi (+Zr where specified) limited as grain-refiner residual | ≤ 0.2 | 0.03 |
| Others (each)0.15 % total | ≤ 0.05 | — |
| Al | balance | — |
7022-T651 — frequently asked
What is 7022-T651 used for?
7022-T651 is typically used for structural forgings, military vehicle components and high-strength extrusions. In short: stronger than 7020; forging and extrusion grade; not arc weldable.
What is the yield strength of 7022-T651?
7022-T651 has a typical yield strength of 470 MPa (68.2 ksi) and a tensile strength of 530 MPa (76.9 ksi) — stronger than 93% of aluminum grades. Strength varies by condition: see the 5 listed tempers.
Is 7022-T651 easy to machine?
Yes — machinability is rated very good (75/100, better than 86% of aluminum grades). Machines very freely in T6/T651 with sharp polished-flute carbide, high speed and copious coolant; chips are short and surfaces take a fine finish.
Can 7022-T651 be welded?
Not readily — weldability is rated poor (20/100). Not recommended for fusion welding because of the Cu content (hot cracking and severe HAZ loss); use mechanical fastening, adhesive bonding or friction stir where qualified.
What surface finishes work on 7022-T651?
Responds well to hard and sulphuric anodising (slightly grey tone), chromate/chrome-free conversion coating and paint; polish before anodising for mould surfaces.
Can 7022-T651 be formed, bent or molded?
Form in the O or freshly solution-treated condition — T6/T651 material has low ductility and generous bend radii are mandatory; hot forge above ~400 °C.
What is the maximum service temperature of 7022-T651?
7022-T651 is rated for continuous use to about 120°C (248 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 7022-T651 and 7022-O?
T651 is the default condition — default stocked condition for thick plate and tooling/mould plate — peak strength with low residual stress so heavily machined parts stay flat. O: pick for maximum formability or as an intermediate condition before solution treatment; strength is low and must be restored by T6 ageing. Yield strength is 470 MPa in T651 versus 120 MPa in O.
Sources
- EN 573-3 Aluminium and aluminium alloys — chemical composition — CEN (2019)
- EN 485-2 Aluminium sheet, strip and plate — mechanical properties — CEN (2018)
- EN 755-2 Aluminium extruded rod/bar, tube and profiles — mechanical properties — CEN (2016)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- High-strength AlZnMgCu (7022-type) mould plate datasheets — European aluminium plate producers (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.