Aluminum 2098-T82
Precip hard
AA 2098 · UNS A92098
T82 = solution heat treated, cold worked and artificially aged
Choose when maximum yield strength in thin sheet is required and toughness demands are moderate.
Values for the T82 condition
Other 2098 tempers and conditions
2098 is listed in 8 conditions; see the grade overview at 2098.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Softest condition for maximum forming or intermediate mill processing before re-solution treatment. | 140 | 265 | 17 | 70 HB | 38 % IACS |
T3, stress relieved by stretching | Stress-relieved plate/sheet stock for machining or forming ahead of final artificial ageing; low residual stress and stable dimensions. | 290 | 400 | 15 | 112 HB | 29 % IACS |
Solution heat treated, cold worked and naturally aged | Sheet condition supplied for forming/stretch operations that will be finished by artificial ageing to a T8 temper. | 300 | 410 | 14 | 115 HB | 28 % IACS |
T851Default T8, stress relieved by stretching | Default aerospace plate condition: low residual stress for heavy machining of bulkheads and ribs with peak-aged strength. | 490 | 525 | 8 | 150 HB | 30 % IACS |
Solution heat treated, cold worked and artificially aged | Slightly de-rated ageing practice used when damage tolerance and toughness are traded against a small strength loss. | 495 | 535 | 9 | 150 HB | 31 % IACS |
Solution heat treated, cold worked and artificially aged | Standard peak-strength sheet temper for fuselage skins and panels where strength plus fatigue-crack-growth resistance dominate. | 505 | 545 | 8 | 155 HB | 30 % IACS |
T82This page Solution heat treated, cold worked and artificially aged | Choose when maximum yield strength in thin sheet is required and toughness demands are moderate. | 520 | 555 | 7 | 158 HB | 32 % IACS |
Solution heat treated, cold worked and artificially aged | Highest-strength registered sheet condition; used where static strength governs and ductility/toughness margins are large. | 535 | 570 | 6 | 165 HB | 33 % IACS |
What is 2098-T82?
2098-T82 is 2098 in the T82 condition — choose when maximum yield strength in thin sheet is required and toughness demands are moderate. 2098-T82 has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 555 MPa (80.5 ksi) — stronger than 97% of aluminum grades. Elongation at break is 7% and the elastic modulus is 77 GPa (11.2 Msi). 2098-T82 has a density of 2.7 g/cm³ (0.0975 lb/in³), lighter than 59% of aluminum grades. It melts at 545°C (1,013 °F). T851 is the default condition FabDigit quotes; T82 is available on request or by drawing note.
Advantages
- High strength — 520 MPa (75.4 ksi), better than 97% of aluminum grades
- Tough — resists crack growth — 31 MPa·√m (28.2 ksi·√in), better than 80% of aluminum grades
Limitations
- Poor heat conductor — 103 W/m·K (59.5 BTU/hr·ft·°F), worse than 92% of aluminum grades
- Limited service temperature — 120°C (248 °F), worse than 79% of aluminum grades
- Difficult to weld — 25/100, worse than 76% of aluminum grades
2098-T82 properties
Typical room-temperature values for 2098-T82; 20 are specific to this condition. Other listed values are 2098 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
2098-T82 has a density of 2.7 g/cm³ (0.0975 lb/in³), lighter than 59% of aluminum grades. It melts at 545°C (1,013 °F).
Mechanical13
2098-T82 has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 555 MPa (80.5 ksi) — stronger than 97% of aluminum grades. Elongation at break is 7% and the elastic modulus is 77 GPa (11.2 Msi).
Thermal6
2098-T82 is rated for continuous service to 120°C (248 °F). It conducts heat at 103 W/m·K (59.5 BTU/hr·ft·°F), worse than 92% of aluminum grades. Thermal expansion is 22.3 µm/m·K (12.4 µin/in·°F).
Electrical3
2098-T82 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 2098-T82 takes about 215 MJ of energy and emits 13.5 kg of CO₂ — more than 93% of aluminum grades. Typical recycled content is 5%.
Manufacturability7
2098-T82's machinability is good (65/100, better than 62% of aluminum grades); weldability poor (25/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 2098-T82
Is 2098 easy to machine?
Machines like 2024-T851 with sharp carbide, high speed and flood coolant; Li/Zr constituents are mildly abrasive and thin machined webs can distort unless a stress-relieved (T351/T851) plate is used.
Can 2098 be welded?
Fusion welding is crack- and porosity-sensitive because of Li oxidation; friction-stir welding or mechanical fastening (rivets/bolts) is the normal joining route.
Can 2098 be formed, bent or molded?
Form in T3/T351 then age to T8-type tempers; peak-aged material has limited bend ductility and marked anisotropy between L and LT directions.
What surface finishes work on 2098?
Alkaline clean and deoxidize, then chromic/sulfuric or tartaric-sulfuric anodize plus epoxy primer; conversion coating alone is inadequate for chloride service and bare surfaces should not be left unprotected.
2098 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 |
|---|---|---|
| Cu | 3.2 – 3.8 | 3.5 |
| Liprincipal density-reducing addition | 0.8 – 1.3 | 1.05 |
| Mg | 0.25 – 0.8 | 0.5 |
| Agpromotes fine T1/Ω-type precipitation | 0.25 – 0.6 | 0.4 |
| Zrgrain-structure control | 0.04 – 0.18 | 0.11 |
| Mn | ≤ 0.35 | — |
| Zn | ≤ 0.35 | — |
| Fe | ≤ 0.15 | — |
| Si | ≤ 0.12 | — |
| Ti | ≤ 0.1 | — |
| Others (each)others total 0.15 max | ≤ 0.05 | — |
| Al | balance | — |
2098-T82 — frequently asked
What is 2098-T82 used for?
2098-T82 is typically used for aircraft plate for machined structure, structural fittings, wing skin and rib components, machined bulkheads and frames, lightweight aerospace brackets and fuselage substructure plate. In short: third-generation Al-Cu-Li plate; high strength-to-weight ratio; machines like 2024-T851.
What is the yield strength of 2098-T82?
2098-T82 has a typical yield strength of 520 MPa (75.4 ksi) and a tensile strength of 555 MPa (80.5 ksi) — stronger than 97% of aluminum grades. Strength varies by condition: see the 8 listed tempers.
Is 2098-T82 easy to machine?
Reasonably — machinability is rated good (65/100, better than 62% of aluminum grades). Machines like 2024-T851 with sharp carbide, high speed and flood coolant; Li/Zr constituents are mildly abrasive and thin machined webs can distort unless a stress-relieved (T351/T851) plate is used.
Can 2098-T82 be welded?
Not readily — weldability is rated poor (25/100). Fusion welding is crack- and porosity-sensitive because of Li oxidation; friction-stir welding or mechanical fastening (rivets/bolts) is the normal joining route.
What surface finishes work on 2098-T82?
Alkaline clean and deoxidize, then chromic/sulfuric or tartaric-sulfuric anodize plus epoxy primer; conversion coating alone is inadequate for chloride service and bare surfaces should not be left unprotected.
Can 2098-T82 be formed, bent or molded?
Form in T3/T351 then age to T8-type tempers; peak-aged material has limited bend ductility and marked anisotropy between L and LT directions.
What is the maximum service temperature of 2098-T82?
2098-T82 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 2098-T851 and 2098-O?
T851 is the default condition — default aerospace plate condition: low residual stress for heavy machining of bulkheads and ribs with peak-aged strength. O: softest condition for maximum forming or intermediate mill processing before re-solution treatment. Yield strength is 490 MPa in T851 versus 140 MPa in O.
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)
- MMPDS Metallic Materials Properties Development and Standardization (Al-Li alloy chapters) — Battelle/FAA (2023)
- Third-generation Al-Li plate and sheet product data — Alcoa / Arconic / Constellium (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.