Aluminum 7020-T6510
Temper
AA 7020 · UNS A97020 · EN AW-7020, 3.4335 · BS H17
T6510 = solution treated, stretched, aged; no further straightening
Extruded profiles with controlled stretch for low residual stress in long machined members.
Values for the T6510 condition
Other 7020 tempers and conditions
7020 is listed in 10 conditions; see the grade overview at 7020.
Compare all 10 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Choose for maximum formability before forming and re-solution treating; strength is low and unstable against natural aging. | 115 | 225 | 17 | 60 HB | 40 % IACS |
Solution heat treated and naturally aged | Pick when parts must be bent/formed after heat treatment and then allowed to age (or later artificially aged) to full strength. | 210 | 330 | 16 | 92 HB | 29 % IACS |
T4, stress relieved by stretching | 7020 plate solution-treated, stretched to relieve residual stress, then naturally aged — moderate strength with good formability and low machining distortion. | 215 | 340 | 16 | 88 HB | 29 % IACS |
Solution heat treated and overaged for stress-corrosion resistance | Specify for thick sections or chloride/humid service where stress-corrosion and exfoliation resistance outweigh a ~10 % strength loss. | 290 | 350 | 13 | 108 HB | 37 % IACS |
Cooled from hot working and artificially aged | Economical route for thin-wall extrusions: 7020 is press-quenchable, so aging directly off the press gives near-T6 strength with less distortion. | 310 | 360 | 11 | 112 HB | 32 % IACS |
T6, heat treated by the user | 7020 re-solution-treated and artificially aged after forming or welding, giving T6-level peak-aged strength without producer stress relief. | 315 | 375 | 11 | 113 HB | 32 % IACS |
T6, stress relieved by stretching | Plate condition for machined structural parts where flatness and low residual stress matter. | 330 | 380 | 11 | 118 HB | 32 % IACS |
Solution heat treated and artificially aged | Standard supply condition: peak strength for welded structural work, bridges, armour and frames. | 340 | 385 | 12 | 120 HB | 32 % IACS |
T6510This page Solution treated, stretched, aged; no further straightening | Extruded profiles with controlled stretch for low residual stress in long machined members. | 345 | 385 | 11 | 120 HB | 32 % IACS |
T6, stress relieved by stretching, minor straightening | Most common bar/extrusion temper for machined 7020 components needing straightness plus low residual stress. | 345 | 385 | 11 | 120 HB | 32 % IACS |
What is 7020-T6510?
7020-T6510 is 7020 in the T6510 temper — extruded profiles with controlled stretch for low residual stress in long machined members. 7020-T6510 has a yield strength of 345 MPa (50 ksi) and a tensile strength of 385 MPa (55.8 ksi) — stronger than 83% of aluminum grades. Elongation at break is 11% and the elastic modulus is 70 GPa (10.2 Msi). 7020-T6510 has a density of 2.78 g/cm³ (0.1 lb/in³), heavier than 74% of aluminum grades. It melts at 605°C (1,121 °F).
Advantages
- High strength — 345 MPa (50 ksi), better than 83% of aluminum grades
- Tough — resists crack growth — 31 MPa·√m (28.2 ksi·√in), better than 80% of aluminum grades
Limitations
- Limited service temperature — 120°C (248 °F), worse than 79% of aluminum grades
7020-T6510 properties
Typical room-temperature values for 7020-T6510; 19 are specific to this condition. Other listed values are 7020 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
7020-T6510 has a density of 2.78 g/cm³ (0.1 lb/in³), heavier than 74% of aluminum grades. It melts at 605°C (1,121 °F).
Mechanical13
7020-T6510 has a yield strength of 345 MPa (50 ksi) and a tensile strength of 385 MPa (55.8 ksi) — stronger than 83% of aluminum grades. Elongation at break is 11% and the elastic modulus is 70 GPa (10.2 Msi).
Thermal6
7020-T6510 is rated for continuous service to 120°C (248 °F). It conducts heat at 125 W/m·K (72.2 BTU/hr·ft·°F), worse than 72% of aluminum grades. Thermal expansion is 23.1 µm/m·K (12.8 µin/in·°F).
Electrical3
7020-T6510 conducts electricity at 32 % IACS, worse than 63% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 51% of aluminum grades.
Sustainability4
Producing a kilogram of 7020-T6510 takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 25%.
Manufacturability8
7020-T6510's machinability is good (57/100, worse than 55% of aluminum grades); weldability very good (78/100); formability poor (28/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 7020-T6510
Is 7020 easy to machine?
Machines well in T6/T651 with sharp carbide tools, high speed and flood coolant; softer T4/O tempers tend to smear and build up on the edge.
Can 7020 be welded?
The most weldable 7000-series alloy — MIG/TIG with 5356 or 5183 filler, HAZ recovers most strength by natural re-aging over 2–4 weeks; avoid restraint and pre-heat to limit SCC in the HAZ.
Can 7020 be formed, bent or molded?
Form in O or T4; T6 bends need generous radii (≥3–4 t) as ductility is limited; hot forming above ~350 °C degrades the temper.
What surface finishes work on 7020?
Anodizes to a slightly grey/yellow clear film and takes hard coat well; chromate/chromate-free conversion coatings and paint are common on structural welded assemblies to combat exfoliation.
7020 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 | ≤ 0.35 | 0.15 |
| Fe | ≤ 0.4 | 0.25 |
| Cukept low for weldability | ≤ 0.2 | 0.1 |
| Mn | 0.05 – 0.5 | 0.25 |
| Mg | 1 – 1.4 | 1.2 |
| Cr | 0.1 – 0.35 | 0.2 |
| Zn | 4 – 5 | 4.5 |
| ZrZr+Ti 0.08–0.25 | 0.08 – 0.2 | 0.14 |
| Ti | ≤ 0.2 | 0.05 |
| Others (each)total 0.15 max | ≤ 0.05 | — |
| Al | balance | — |
7020-T6510 — frequently asked
What is 7020-T6510 used for?
7020-T6510 is typically used for bridges, cranes and military vehicles. In short: weldable structural 7000 series.
What is the yield strength of 7020-T6510?
7020-T6510 has a typical yield strength of 345 MPa (50 ksi) and a tensile strength of 385 MPa (55.8 ksi) — stronger than 83% of aluminum grades. Strength varies by condition: see the 10 listed tempers.
Is 7020-T6510 easy to machine?
Reasonably — machinability is rated good (57/100, worse than 55% of aluminum grades). Machines well in T6/T651 with sharp carbide tools, high speed and flood coolant; softer T4/O tempers tend to smear and build up on the edge.
Can 7020-T6510 be welded?
Yes — weldability is rated very good (78/100). The most weldable 7000-series alloy — MIG/TIG with 5356 or 5183 filler, HAZ recovers most strength by natural re-aging over 2–4 weeks; avoid restraint and pre-heat to limit SCC in the HAZ.
What surface finishes work on 7020-T6510?
Anodizes to a slightly grey/yellow clear film and takes hard coat well; chromate/chromate-free conversion coatings and paint are common on structural welded assemblies to combat exfoliation.
Can 7020-T6510 be formed, bent or molded?
Form in O or T4; T6 bends need generous radii (≥3–4 t) as ductility is limited; hot forming above ~350 °C degrades the temper.
What is the maximum service temperature of 7020-T6510?
7020-T6510 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.
Can FabDigit make parts in 7020-T6510?
Yes — 7020-T6510 is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
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)
- EN 515 Aluminium wrought products — temper designations — CEN (2017)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B / Vol. 19 — Corrosion and Fatigue of Aluminium Alloys — ASM International (2005)
- EN AW-7020 (AlZn4.5Mg1) plate and extrusion datasheets — European aluminium producers (2023)
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.