Aluminum 249.0
AA 249.0 · UNS A02490
249.0 (UNS A02490) is a high-strength Al-Cu casting alloy in the ANSI/AA 2xx.x family, developed for improved elevated-temperature mechanical properties and supplied in F, T4, T6, T62 and T7 conditions.
Reference datasheet — 249.0 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the T7 condition
249.0 tempers and conditions
249.0 is supplied in 5 conditions, soft to hard. T7 is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | As-cast, no heat treatment — only for non-structural parts or as an intermediate state before solution treatment. | 110 | 195 | 2.5 | 65 HB | 38 % IACS |
Solution heat treated and naturally aged | Pick when maximum ductility and toughness matter more than yield strength, or before further forming/straightening. | 200 | 330 | 12 | 85 HB | 29 % IACS |
T7Default Solution heat treated and overaged (stabilized) | Default aerospace condition: slightly lower strength than T6 but better dimensional stability, elevated-temperature retention and resistance to intergranular/stress-corrosion attack. | 345 | 415 | 5 | 110 HB | 33 % IACS |
Solution heat treated and artificially aged | Use for maximum room-temperature strength where corrosion exposure is controlled by coatings. | 380 | 440 | 4 | 125 HB | 31 % IACS |
T6, heat treated by the user | Foundry heat-treat variant giving the highest registered strength; choose for critical thin-wall aerospace castings with tight process control. | 415 | 470 | 3 | 135 HB | 32 % IACS |
What is 249.0?
249.0 (UNS A02490) is a high-strength Al-Cu casting alloy in the ANSI/AA 2xx.x family, developed for improved elevated-temperature mechanical properties and supplied in F, T4, T6, T62 and T7 conditions. Engineers specify it for sand and permanent-mold aerospace structural castings, where the default T-condition values of 345 MPa yield, 415 MPa tensile, 5 % elongation and 110 HB are hard to reach with Al-Si alloys. Limits are poor fusion weldability, corrosion resistance rated 38, a 175 °C service ceiling and restricted availability; A206.0 is the nearest alternative for high-strength cast structure. 249.0 has a density of 2.81 g/cm³ (0.102 lb/in³), heavier than 86% of aluminum grades. It melts at 540°C (1,004 °F). 249.0 has a yield strength of 345 MPa (50 ksi) and a tensile strength of 415 MPa (60.2 ksi) — stronger than 83% of aluminum grades. Elongation at break is 5% and the elastic modulus is 71 GPa (10.3 Msi).
What is 249.0 used for?
- Aerospace structural castings
- High-temperature brackets and fittings
- Airframe fitting and hinge castings
- Highly loaded housings and gearbox cases
- Missile and actuator body castings
- HIP-treated critical cast components
Advantages
- Easy to machine — 75/100, better than 86% of aluminum grades
- High strength — 345 MPa (50 ksi), better than 83% of aluminum grades
- High service temperature — 175°C (347 °F), better than 83% of aluminum grades
Limitations
- Needs corrosion protection — 38/100, worse than 79% of aluminum grades
- Difficult to weld — 25/100, worse than 76% of aluminum grades
249.0 properties
Typical room-temperature values for 249.0-T7; bars are the position among aluminum grades.
Physical3
249.0 has a density of 2.81 g/cm³ (0.102 lb/in³), heavier than 86% of aluminum grades. It melts at 540°C (1,004 °F).
Mechanical12
249.0 has a yield strength of 345 MPa (50 ksi) and a tensile strength of 415 MPa (60.2 ksi) — stronger than 83% of aluminum grades. Elongation at break is 5% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
249.0 is rated for continuous service to 175°C (347 °F). It conducts heat at 125 W/m·K (72.2 BTU/hr·ft·°F), worse than 72% of aluminum grades. Thermal expansion is 22.8 µm/m·K (12.7 µin/in·°F).
Electrical3
249.0 conducts electricity at 33 % IACS, worse than 57% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (38/100), worse than 79% of aluminum grades.
Sustainability4
Producing a kilogram of 249.0 takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 10%.
Manufacturability7
249.0's machinability is very good (75/100, better than 86% of aluminum grades); weldability poor (25/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the aluminum family
Yield strength against density for every aluminum grade FabDigit runs. 249.0 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 249.0
Is 249.0 easy to machine?
Machines well in T6/T7 with sharp carbide or PCD tools, high speeds and generous coolant; watch for porosity breakout on machined sealing faces.
Can 249.0 be welded?
Poor fusion weldability — Al-Cu castings are highly hot-crack sensitive; repair welding only by qualified procedure (2319-type filler) followed by re-solution/re-age.
Can 249.0 be formed, bent or molded?
Sand or permanent-mold cast with heavy chilling, directional solidification and strong risering; wide freezing range makes it prone to hot tearing and micro-shrinkage, HIP is often used on critical parts.
249.0 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 |
|---|---|---|
| Cuprincipal strengthening element | 3.8 – 4.6 | 4.2 |
| Znco-strengthener with Mg | 2.5 – 3.5 | 3 |
| Mg | 0.25 – 0.45 | 0.35 |
| Mndispersoid former, grain-structure control | 0.25 – 0.5 | 0.35 |
| Tigrain refiner | 0.05 – 0.25 | 0.15 |
| Siimpurity limit — high purity required | ≤ 0.05 | |
| Feimpurity limit | ≤ 0.1 | |
| Others (each) | ≤ 0.05 | |
| Others (total) | ≤ 0.15 | |
| Al | balance |
What surface finishes work on 249.0?
Chromic/sulfuric anodize gives only fair protection because of Cu-rich phases; standard aerospace practice is conversion coat plus epoxy primer and topcoat.
Surface treatments FabDigit runs on aluminum parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Equivalent designations
Standards and trade names that resolve to Aluminum 249.0 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- A02490
How much does 249.0 cost?
249.0 is a premium-cost aluminum ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
249.0 — frequently asked
What is 249.0 used for?
249.0 is typically used for aerospace structural castings, high-temperature brackets and fittings, airframe fitting and hinge castings, highly loaded housings and gearbox cases, missile and actuator body castings and HIP-treated critical cast components. In short: highest-strength cast aluminum family; aerospace structural casting alloy; hot-crack sensitive, poor weldability.
What is the yield strength of 249.0?
249.0 has a typical yield strength of 345 MPa (50 ksi) and a tensile strength of 415 MPa (60.2 ksi) — stronger than 83% of aluminum grades. Strength varies by condition: see the 5 listed tempers.
Is 249.0 easy to machine?
Yes — machinability is rated very good (75/100, better than 86% of aluminum grades). Machines well in T6/T7 with sharp carbide or PCD tools, high speeds and generous coolant; watch for porosity breakout on machined sealing faces.
Can 249.0 be welded?
Not readily — weldability is rated poor (25/100). Poor fusion weldability — Al-Cu castings are highly hot-crack sensitive; repair welding only by qualified procedure (2319-type filler) followed by re-solution/re-age.
What surface finishes work on 249.0?
Chromic/sulfuric anodize gives only fair protection because of Cu-rich phases; standard aerospace practice is conversion coat plus epoxy primer and topcoat.
Can 249.0 be formed, bent or molded?
Sand or permanent-mold cast with heavy chilling, directional solidification and strong risering; wide freezing range makes it prone to hot tearing and micro-shrinkage, HIP is often used on critical parts.
What is the maximum service temperature of 249.0?
249.0 is rated for continuous use to about 175°C (347 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between 249.0-T7 and 249.0-F?
T7 is the default condition — default aerospace condition: slightly lower strength than T6 but better dimensional stability, elevated-temperature retention and resistance to intergranular/stress-corrosion attack. F: as-cast, no heat treatment — only for non-structural parts or as an intermediate state before solution treatment. Yield strength is 345 MPa in T7 versus 110 MPa in F.
How much does 249.0 cost?
249.0 is a premium-cost aluminum ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- Registration Record of Aluminum Association Alloy Designations and Chemical Composition Limits for Aluminum Alloys in the Form of Castings and Ingot ('Pink Sheets') — The Aluminum Association (2018)
- ASTM B108 — Aluminum-Alloy Permanent Mold Castings — ASTM International (2019)
- ASTM B26/B26M — Aluminum-Alloy Sand Castings — ASTM International (2018)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Specialty Handbook: Aluminum and Aluminum Alloys — ASM International (1993)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.