Aluminum 7075-T6511
Temper
AA 7075 · UNS A97075 · EN AlZn5.5MgCu, AlZnMgCu1.5 · JIS A7075, A7075P · GB 7A09, LC9
T6511 = t6, stress relieved by stretching, minor straightening
Low-residual-stress extruded bar/profile for machined aerospace fittings.
Values for the T6511 condition
Other 7075 tempers and conditions
7075 is listed in 13 conditions; see the grade overview at 7075.
Compare all 13 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Softest condition for deep forming, severe bending or cold heading; must be solution treated and aged afterwards to develop strength. | 103 | 228 | 17 | 60 HB | 45 % IACS |
Overaged (T73-type) + stress relieved by compression | T73-type overaged forgings compressively stress-relieved for low residual stress, high SCC immunity and good short-transverse toughness. | 395 | 470 | 10 | 135 HB | 40 % IACS |
Solution heat treated and overaged (stabilized) | Generic overaged 7075 condition that trades some peak strength for markedly better stress-corrosion-cracking resistance and dimensional stability. | 400 | 475 | 12 | 135 HB | 40 % IACS |
Overaged, stress relieved by compression | Forging temper giving low residual stress plus SCC resistance for large machined forgings. | 420 | 495 | 10 | 132 HB | 40 % IACS |
Solution heat treated and overaged for stress-corrosion resistance | Choose when stress-corrosion cracking resistance in the short-transverse direction is critical; ~12 % lower strength than T6. | 435 | 505 | 13 | 135 HB | 40 % IACS |
T73, stress relieved by stretching | Standard SCC-resistant thick-plate temper for machined aerospace bulkheads and ribs. | 435 | 505 | 12 | 135 HB | 40 % IACS |
T6, stress relieved by compression | Peak-aged 7075 hand/die forgings and blocks given a controlled compressive set to relieve quench stresses, giving near-T6 strength with reduced machining distortion. | 440 | 510 | 8 | 150 HB | 33 % IACS |
T76, stress relieved by stretching | Plate temper balancing near-T6 strength, low residual stress and good exfoliation resistance for machined skins and spars. | 469 | 538 | 11 | 145 HB | 38 % IACS |
Overaged for exfoliation-corrosion resistance | Intermediate overage: better exfoliation resistance than T6 while keeping most of its strength (less SCC-resistant than T73). | 469 | 538 | 11 | 145 HB | 38 % IACS |
T6, heat treated by the user | Same properties as T6 but the heat treatment was performed after forming/machining rather than at the mill. | 495 | 565 | 9 | 148 HB | 33 % IACS |
T6Default Solution heat treated and artificially aged | Peak-strength condition for extrusions, bar and forgings where maximum static strength matters and SCC exposure is controlled. | 503 | 572 | 11 | 150 HB | 33 % IACS |
T6, stress relieved by stretching | Standard stocked plate temper: peak strength with low residual stress, so machined parts stay flat. | 503 | 572 | 11 | 150 HB | 33 % IACS |
T6511This page T6, stress relieved by stretching, minor straightening | Low-residual-stress extruded bar/profile for machined aerospace fittings. | 510 | 580 | 9 | 152 HB | 33 % IACS |
What is 7075-T6511?
7075-T6511 is 7075 in the T6511 temper — low-residual-stress extruded bar/profile for machined aerospace fittings. 7075-T6511 has a yield strength of 510 MPa (74 ksi) and a tensile strength of 580 MPa (84.1 ksi) — stronger than 96% of aluminum grades. Elongation at break is 9% and the elastic modulus is 71.7 GPa (10.4 Msi). 7075-T6511 has a density of 2.81 g/cm³ (0.102 lb/in³), heavier than 86% of aluminum grades. It melts at 477°C (891 °F). T6 is the default condition FabDigit quotes; T6511 is available on request or by drawing note.
Advantages
- High strength — 510 MPa (74 ksi), better than 96% of aluminum grades
- Easy to machine — 78/100, better than 89% of aluminum grades
Limitations
- Difficult to weld — 18/100, worse than 94% of aluminum grades
- Needs corrosion protection — 35/100, worse than 85% of aluminum grades
- Limited service temperature — 120°C (248 °F), worse than 79% of aluminum grades
7075-T6511 properties
Typical room-temperature values for 7075-T6511; 22 are specific to this condition. Other listed values are 7075 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
7075-T6511 has a density of 2.81 g/cm³ (0.102 lb/in³), heavier than 86% of aluminum grades. It melts at 477°C (891 °F).
Mechanical16
7075-T6511 has a yield strength of 510 MPa (74 ksi) and a tensile strength of 580 MPa (84.1 ksi) — stronger than 96% of aluminum grades. Elongation at break is 9% and the elastic modulus is 71.7 GPa (10.4 Msi).
Thermal6
7075-T6511 is rated for continuous service to 120°C (248 °F). It conducts heat at 130 W/m·K (75.1 BTU/hr·ft·°F), worse than 65% of aluminum grades. Thermal expansion is 23.6 µm/m·K (13.1 µin/in·°F).
Electrical3
7075-T6511 conducts electricity at 33 % IACS, worse than 57% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (35/100), worse than 85% of aluminum grades.
Sustainability4
Producing a kilogram of 7075-T6511 takes about 205 MJ of energy and emits 12.5 kg of CO₂ — more than 76% of aluminum grades. Typical recycled content is 15%.
Manufacturability7
7075-T6511's machinability is very good (78/100, better than 89% of aluminum grades); weldability poor (18/100); formability poor (22/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 7075-T6511
Is 7075 easy to machine?
Excellent chip control in T6/T651 — run high SFM with sharp polished-flute carbide, 2–3 flutes, generous coolant; leave symmetric stock and rough/finish in passes on T6 plate to avoid distortion (T651/T7351 are preferred for heavy metal removal).
Can 7075 be welded?
Not recommended for arc fusion welding (severe hot cracking and HAZ SCC); join by mechanical fastening, adhesive bonding, or friction-stir welding, and use 7000-series-compatible fillers only for repair of non-critical parts.
Can 7075 be formed, bent or molded?
Form in O or freshly solution-treated (W) condition then age; T6/T651 tolerates only large-radius bends (≥4–6 t) and cracks readily in tight cold forms.
What surface finishes work on 7075?
Takes Type II and Type III hard anodising well (grey/bronze tone, up to ~50 µm); chromate/trivalent conversion coating plus epoxy primer is standard for corrosion protection; shot peening improves fatigue and SCC life.
7075 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 |
|---|---|---|
| Znprincipal strengthening addition | 5.1 – 6.1 | 5.6 |
| Mg | 2.1 – 2.9 | 2.5 |
| Curaises strength, lowers corrosion resistance | 1.2 – 2 | 1.6 |
| Crgrain-structure control; SCC resistance | 0.18 – 0.28 | 0.23 |
| Feimpurity max | ≤ 0.5 | 0.25 |
| Siimpurity max | ≤ 0.4 | 0.15 |
| Mn | ≤ 0.3 | 0.05 |
| Ti | ≤ 0.2 | 0.03 |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
7075-T6511 — frequently asked
What is 7075-T6511 used for?
7075-T6511 is typically used for aerospace components, defense equipment and gears. In short: ultimate strength; aerospace favorite.
What is the yield strength of 7075-T6511?
7075-T6511 has a typical yield strength of 510 MPa (74 ksi) and a tensile strength of 580 MPa (84.1 ksi) — stronger than 96% of aluminum grades. Strength varies by condition: see the 13 listed tempers.
Is 7075-T6511 easy to machine?
Yes — machinability is rated very good (78/100, better than 89% of aluminum grades). Excellent chip control in T6/T651 — run high SFM with sharp polished-flute carbide, 2–3 flutes, generous coolant; leave symmetric stock and rough/finish in passes on T6 plate to avoid distortion (T651/T7351 are preferred for heavy metal removal).
Can 7075-T6511 be welded?
Not readily — weldability is rated poor (18/100). Not recommended for arc fusion welding (severe hot cracking and HAZ SCC); join by mechanical fastening, adhesive bonding, or friction-stir welding, and use 7000-series-compatible fillers only for repair of non-critical parts.
What surface finishes work on 7075-T6511?
Takes Type II and Type III hard anodising well (grey/bronze tone, up to ~50 µm); chromate/trivalent conversion coating plus epoxy primer is standard for corrosion protection; shot peening improves fatigue and SCC life.
Can 7075-T6511 be formed, bent or molded?
Form in O or freshly solution-treated (W) condition then age; T6/T651 tolerates only large-radius bends (≥4–6 t) and cracks readily in tight cold forms.
What is the maximum service temperature of 7075-T6511?
7075-T6511 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 7075-T6 and 7075-O?
T6 is the default condition — peak-strength condition for extrusions, bar and forgings where maximum static strength matters and SCC exposure is controlled. O: softest condition for deep forming, severe bending or cold heading; must be solution treated and aged afterwards to develop strength. Yield strength is 503 MPa in T6 versus 103 MPa in O.
Can FabDigit make parts in 7075-T6511?
Yes — 7075-T6511 is available for CNC machining and sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- Aluminum Standards and Data / Teal Sheets (Registration Record of Alloys) — The Aluminum Association (2018)
- ASTM B209 / B211 / B221 — aluminium sheet, plate, bar and extrusions — ASTM International (2021)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- MMPDS-17 Metallic Materials Properties Development and Standardization — Battelle/FAA (2022)
- 7075 plate and extrusion datasheets — Kaiser Aluminum / Constellium (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.