Aluminum 7093-T76
Precip hard
AA 7093 · UNS A97093
T76 = overaged for exfoliation-corrosion resistance
Intermediate over-age: keeps most of the T6 strength while markedly improving exfoliation/SCC behaviour.
Values for the T76 condition
Other 7093 tempers and conditions
7093 is listed in 5 conditions; see the grade overview at 7093.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Semi-finished billet/extrusion stock bought for subsequent solution treatment and aging; no guaranteed mechanical properties. | 290 | 400 | 12 | 110 HB | 38 % IACS |
Solution heat treated and overaged for stress-corrosion resistance | Pick when parts see marine/humid service or sustained tensile stress and SCC must be avoided; ~12–15 % strength penalty. | 550 | 615 | 12 | 158 HB | 38 % IACS |
T76This page Overaged for exfoliation-corrosion resistance | Intermediate over-age: keeps most of the T6 strength while markedly improving exfoliation/SCC behaviour. | 600 | 655 | 11 | 9 HRC | 35 % IACS |
T6, stress relieved by stretching | Choose for plate that will be heavily machined and must stay dimensionally stable at near-peak strength. | 635 | 690 | 10 | 12 HRC | 31 % IACS |
T6Default Solution heat treated and artificially aged | Default condition: maximum strength for sporting-goods and high-performance structural parts where chloride exposure is limited. | 648 | 703 | 10 | 180 HB | 31 % IACS |
What is 7093-T76?
7093-T76 is 7093 in the T76 condition — intermediate over-age: keeps most of the T6 strength while markedly improving exfoliation/SCC behaviour. 7093-T76 has a yield strength of 600 MPa (87 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 98% of aluminum grades. Elongation at break is 11% and the elastic modulus is 72 GPa (10.4 Msi). 7093-T76 has a density of 2.86 g/cm³ (0.103 lb/in³), heavier than 97% of aluminum grades. It melts at 475°C (887 °F). T6 is the default condition FabDigit quotes; T76 is available on request or by drawing note.
Advantages
- High strength — 600 MPa (87 ksi), better than 98% of aluminum grades
- Polishes to a fine finish — 65/100, better than 82% of aluminum grades
- Tough — resists crack growth — 31 MPa·√m (28.2 ksi·√in), better than 80% of aluminum grades
Limitations
- Difficult to weld — 12/100, worse than 98% of aluminum grades
- High embodied carbon — 14.5 kg CO₂/kg, worse than 97% of aluminum grades
7093-T76 properties
Typical room-temperature values for 7093-T76; 23 are specific to this condition. Other listed values are 7093 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
7093-T76 has a density of 2.86 g/cm³ (0.103 lb/in³), heavier than 97% of aluminum grades. It melts at 475°C (887 °F).
Mechanical13
7093-T76 has a yield strength of 600 MPa (87 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 98% of aluminum grades. Elongation at break is 11% and the elastic modulus is 72 GPa (10.4 Msi).
Thermal6
7093-T76 is rated for continuous service to 140°C (284 °F). It conducts heat at 155 W/m·K (89.6 BTU/hr·ft·°F), better than 71% of aluminum grades. Thermal expansion is 23.4 µm/m·K (13 µin/in·°F).
Electrical3
7093-T76 conducts electricity at 35 % IACS, better than 52% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (42/100), worse than 69% of aluminum grades.
Sustainability4
Producing a kilogram of 7093-T76 takes about 215 MJ of energy and emits 14.5 kg of CO₂ — more than 93% of aluminum grades. Typical recycled content is 5%.
Manufacturability7
7093-T76's machinability is good (68/100, better than 67% of aluminum grades); weldability not recommended (12/100); formability poor (18/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 7093-T76
Is 7093 easy to machine?
Machines cleanly in T6 with sharp carbide, high speed and flood coolant; chips are short, but the hard Zr/Zn microstructure abrades tooling faster than 7075 and thin walls spring back at high cutting loads.
Can 7093 be welded?
Not recommended for fusion welding (hot cracking, drastic HAZ softening and SCC); join by adhesive bonding, mechanical fasteners or friction stir with post-weld heat treatment.
Can 7093 be formed, bent or molded?
Form only in F or freshly solution-treated (W) condition; T6/T73 stock has very limited cold formability — use generous bend radii or hot forming above 300 °C followed by re-heat-treatment.
What surface finishes work on 7093?
Takes sulfuric and hard anodizing well (slightly darker tone from Zn/Cu), chromate/trivalent conversion coating and paint; shot-peen highly loaded surfaces and avoid peak-aged T6 in bare chloride service.
7093 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 | 8.3 – 9.7 | 9 |
| Mg | 2 – 3 | 2.5 |
| Cu | 1.1 – 1.8 | 1.5 |
| Zrdispersoid for grain-structure control | 0.05 – 0.15 | 0.11 |
| Si | ≤ 0.12 | — |
| Fe | ≤ 0.15 | — |
| Mn | ≤ 0.1 | — |
| Cr | ≤ 0.05 | — |
| Ti | ≤ 0.06 | — |
| Others (each)0.15 total max | ≤ 0.05 | — |
| Al | balance | — |
7093-T76 — frequently asked
What is 7093-T76 used for?
7093-T76 is typically used for golf club heads, high-performance sporting equipment and aerospace fittings. In short: ultra-high-strength 7000-series grade; above 7075 strength; specialty availability only.
What is the yield strength of 7093-T76?
7093-T76 has a typical yield strength of 600 MPa (87 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 98% of aluminum grades. Strength varies by condition: see the 5 listed tempers.
Is 7093-T76 easy to machine?
Reasonably — machinability is rated good (68/100, better than 67% of aluminum grades). Machines cleanly in T6 with sharp carbide, high speed and flood coolant; chips are short, but the hard Zr/Zn microstructure abrades tooling faster than 7075 and thin walls spring back at high cutting loads.
Can 7093-T76 be welded?
Not readily — weldability is rated not recommended (12/100). Not recommended for fusion welding (hot cracking, drastic HAZ softening and SCC); join by adhesive bonding, mechanical fasteners or friction stir with post-weld heat treatment.
What surface finishes work on 7093-T76?
Takes sulfuric and hard anodizing well (slightly darker tone from Zn/Cu), chromate/trivalent conversion coating and paint; shot-peen highly loaded surfaces and avoid peak-aged T6 in bare chloride service.
Can 7093-T76 be formed, bent or molded?
Form only in F or freshly solution-treated (W) condition; T6/T73 stock has very limited cold formability — use generous bend radii or hot forming above 300 °C followed by re-heat-treatment.
What is the maximum service temperature of 7093-T76?
7093-T76 is rated for continuous use to about 140°C (284 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 7093-T6 and 7093-F?
T6 is the default condition — default condition: maximum strength for sporting-goods and high-performance structural parts where chloride exposure is limited. F: semi-finished billet/extrusion stock bought for subsequent solution treatment and aging; no guaranteed mechanical properties. Yield strength is 648 MPa in T6 versus 290 MPa in F.
Sources
- International Alloy Designations and Chemical Composition Limits for Wrought Aluminum (Teal Sheets) — The Aluminum Association (2018)
- ASM Handbook Vol. 2: Properties and Selection — Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Handbook Vol. 7: Powder Metal Technologies and Applications — ASM International (1998)
- Spray-formed / P-M high-strength 7000-series alloy data (7093 and 7093/SiC) — Alcoa / DWA Aluminum Composites (2000)
- ASM Handbook Vol. 13B: Corrosion — Materials (aluminium SCC and galvanic data) — ASM International (2005)
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.