Aluminum 2618-T852
Precip hard
AA 2618 · UNS A92618 · EN AW-2618, AW 2618 · GB 2A70, LD7
T852 = solution treated, cold-worked by compression stress relief,…
Hand/die forgings where compressive stress relief raises strength slightly and cuts machining distortion.
Values for the T852 condition
Other 2618 tempers and conditions
2618 is listed in 6 conditions; see the grade overview at 2618.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Choose for deep forming, straightening or heavy machining before solution treating and ageing. | 125 | 215 | 18 | 65 HB | 41 % IACS |
Solution heat treated and artificially aged | General peak-aged condition for forgings and bar where no stress-relief stretching is applied. | 370 | 440 | 9 | 115 HB | 37 % IACS |
T6 variant, underaged | The standard supply condition for 2618 pistons, turbo wheels and elevated-temperature forgings — best balance of hot strength and residual-stress control. | 372 | 440 | 10 | 115 HB | 37 % IACS |
T6, stress relieved by stretching | Pick for plate and rolled bar that will be heavily machined — low residual stress means minimal distortion. | 375 | 440 | 9 | 118 HB | 37 % IACS |
T6, stress relieved by stretching, minor straightening | Extruded bar/profile equivalent of T651 — use for long machined parts needing straightness and low distortion. | 385 | 450 | 8 | 120 HB | 37 % IACS |
T852This page Solution treated, cold-worked by compression stress relief,… | Hand/die forgings where compressive stress relief raises strength slightly and cuts machining distortion. | 400 | 455 | 8 | 125 HB | 37 % IACS |
What is 2618-T852?
2618-T852 is 2618 in the T852 condition — hand/die forgings where compressive stress relief raises strength slightly and cuts machining distortion. 2618-T852 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 455 MPa (66 ksi) — stronger than 88% of aluminum grades. Elongation at break is 8% and the elastic modulus is 74.5 GPa (10.8 Msi). 2618-T852 has a density of 2.76 g/cm³ (0.0997 lb/in³), heavier than 70% of aluminum grades. It melts at 549°C (1,020 °F).
Advantages
- High service temperature — 200°C (392 °F), better than 90% of aluminum grades
- High strength — 400 MPa (58 ksi), better than 88% of aluminum grades
Limitations
- Needs corrosion protection — 32/100, worse than 94% of aluminum grades
- Difficult to weld — 22/100, worse than 83% of aluminum grades
2618-T852 properties
Typical room-temperature values for 2618-T852; 22 are specific to this condition. Other listed values are 2618 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
2618-T852 has a density of 2.76 g/cm³ (0.0997 lb/in³), heavier than 70% of aluminum grades. It melts at 549°C (1,020 °F).
Mechanical15
2618-T852 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 455 MPa (66 ksi) — stronger than 88% of aluminum grades. Elongation at break is 8% and the elastic modulus is 74.5 GPa (10.8 Msi).
Thermal6
2618-T852 is rated for continuous service to 200°C (392 °F). It conducts heat at 146 W/m·K (84.4 BTU/hr·ft·°F), better than 55% of aluminum grades. Thermal expansion is 22.3 µm/m·K (12.4 µin/in·°F).
Electrical3
2618-T852 conducts electricity at 37 % IACS, better than 58% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is poor (32/100), worse than 94% of aluminum grades.
Sustainability4
Producing a kilogram of 2618-T852 takes about 205 MJ of energy and emits 12.5 kg of CO₂ — more than 76% of aluminum grades. Typical recycled content is 5%.
Manufacturability8
2618-T852's machinability is good (68/100, better than 67% of aluminum grades); weldability poor (22/100); formability poor (18/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 2618-T852
Is 2618 easy to machine?
Machines cleanly in T6/T61 with sharp PCD or polished carbide, high speed and flood coolant; hard Fe-Ni intermetallics accelerate edge wear compared with 6061.
Can 2618 be welded?
Not recommended for fusion welding (hot cracking, loss of aged strength); join by mechanical fasteners, friction welding or FSW with post-weld ageing where qualified.
Can 2618 be formed, bent or molded?
Hot forge/extrude at 400–450 °C; cold forming only in O temper — T61 material is essentially non-formable and must be machined to shape.
What surface finishes work on 2618?
Hard anodize (Type III) for piston crowns and wear faces gives a dark grey, non-uniform film; chromate/TCP conversion coat plus primer for corrosion protection, and avoid bare seawater exposure.
2618 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 | 0.1 – 0.25 | 0.18 |
| Feforms Al9FeNi dispersoids for creep strength | 0.9 – 1.3 | 1.1 |
| Cu | 1.9 – 2.7 | 2.3 |
| Mg | 1.3 – 1.8 | 1.5 |
| Ni | 0.9 – 1.2 | 1.05 |
| Ti | 0.04 – 0.1 | 0.07 |
| Zn | ≤ 0.1 | — |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
2618-T852 — frequently asked
What is 2618-T852 used for?
2618-T852 is typically used for forged engine pistons, turbocharger compressor wheels, cylinder heads, aero-engine accessory components, high-temperature structural forgings and supersonic aircraft skin panels. In short: concorde alloy; high-temp aerospace.
What is the yield strength of 2618-T852?
2618-T852 has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 455 MPa (66 ksi) — stronger than 88% of aluminum grades. Strength varies by condition: see the 6 listed tempers.
Is 2618-T852 easy to machine?
Reasonably — machinability is rated good (68/100, better than 67% of aluminum grades). Machines cleanly in T6/T61 with sharp PCD or polished carbide, high speed and flood coolant; hard Fe-Ni intermetallics accelerate edge wear compared with 6061.
Can 2618-T852 be welded?
Not readily — weldability is rated poor (22/100). Not recommended for fusion welding (hot cracking, loss of aged strength); join by mechanical fasteners, friction welding or FSW with post-weld ageing where qualified.
What surface finishes work on 2618-T852?
Hard anodize (Type III) for piston crowns and wear faces gives a dark grey, non-uniform film; chromate/TCP conversion coat plus primer for corrosion protection, and avoid bare seawater exposure.
Can 2618-T852 be formed, bent or molded?
Hot forge/extrude at 400–450 °C; cold forming only in O temper — T61 material is essentially non-formable and must be machined to shape.
What is the maximum service temperature of 2618-T852?
2618-T852 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in 2618-T852?
Yes — 2618-T852 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
- 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) — FAA/Battelle (2023)
- AMS 4132 — Aluminum Alloy Forgings 2618, Solution and Precipitation Heat Treated — SAE International (2019)
- EN 573-3 / EN 586 — Aluminium and aluminium alloys, chemical composition and forgings — CEN (2019)
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.