Aluminum 6025-T4
Temper
AA 6025 · UNS A96025 · EN AlMg2.5SiMnCu
T4 = solution heat treated and naturally aged
Formable heat-treatable condition — bend or draw in T4, then artificially age to T6 for final strength.
Values for the T4 condition
Other 6025 tempers and conditions
6025 is listed in 10 conditions; see the grade overview at 6025.
Compare all 10 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick for deep drawing, severe bending or when maximum ductility is needed before a forming step. | 100 | 220 | 24 | 55 HB | 35 % IACS |
Slightly strain hardened | Near-O properties with flat, straightened product — for formed parts that must start flat. | 130 | 235 | 20 | 60 HB | 38 % IACS |
T4This page Solution heat treated and naturally aged | Formable heat-treatable condition — bend or draw in T4, then artificially age to T6 for final strength. | 140 | 250 | 20 | 70 HB | 35 % IACS |
Strain hardened then partially annealed, 1/4 hard | Choose when a modest strength gain over O is needed but bending and roll-forming must stay easy. | 180 | 250 | 14 | 68 HB | 34 % IACS |
H32Default Strain hardened and stabilized, quarter hard | The general-purpose stocked sheet temper: balanced strength, formability and SCC stability for structural panels. | 205 | 260 | 12 | 72 HB | 34 % IACS |
Strain hardened and stabilized, half hard | Use where higher yield strength and stiffness-limited gauge reduction matter more than tight bend radii. | 240 | 290 | 9 | 80 HB | 34 % IACS |
Cooled from hot working and artificially aged | Economical press-quenched extrusion temper for medium-strength profiles with good dimensional stability. | 245 | 290 | 10 | 85 HB | 38 % IACS |
Strain hardened and stabilized, three-quarter hard | For flat, lightly formed high-strength parts such as stiffened panels, brackets and can/closure stock. | 270 | 310 | 7 | 87 HB | 33 % IACS |
Strain hardened and stabilized, full hard | Maximum cold-worked strength for flat or roll-formed strip; essentially no bending capability. | 290 | 325 | 5 | 93 HB | 33 % IACS |
Solution heat treated and artificially aged | Highest-strength condition for load-bearing extrusions and machined structural fittings. | 290 | 330 | 10 | 97 HB | 40 % IACS |
What is 6025-T4?
6025-T4 is 6025 in the T4 temper — formable heat-treatable condition — bend or draw in T4, then artificially age to T6 for final strength. 6025-T4 has a yield strength of 140 MPa (20.3 ksi) and a tensile strength of 250 MPa (36.3 ksi) — weaker than 70% of aluminum grades. Elongation at break is 20% and the elastic modulus is 70 GPa (10.2 Msi). 6025-T4 has a density of 2.69 g/cm³ (0.0972 lb/in³), lighter than 67% of aluminum grades. It melts at 590°C (1,094 °F). H32 is the default condition FabDigit quotes; T4 is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 20%, better than 89% of aluminum grades
- Forms and bends easily — 72/100, better than 85% of aluminum grades
Limitations
- Limited service temperature — 120°C (248 °F), worse than 79% of aluminum grades
6025-T4 properties
Typical room-temperature values for 6025-T4; 11 are specific to this condition. Other listed values are 6025 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
6025-T4 has a density of 2.69 g/cm³ (0.0972 lb/in³), lighter than 67% of aluminum grades. It melts at 590°C (1,094 °F).
Mechanical11
6025-T4 has a yield strength of 140 MPa (20.3 ksi) and a tensile strength of 250 MPa (36.3 ksi) — weaker than 70% of aluminum grades. Elongation at break is 20% and the elastic modulus is 70 GPa (10.2 Msi).
Thermal6
6025-T4 is rated for continuous service to 120°C (248 °F). It conducts heat at 145 W/m·K (83.8 BTU/hr·ft·°F), better than 53% of aluminum grades. Thermal expansion is 23.4 µm/m·K (13 µin/in·°F).
Electrical3
6025-T4 conducts electricity at 35 % IACS, better than 52% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), better than 67% of aluminum grades.
Sustainability4
Producing a kilogram of 6025-T4 takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 35%.
Manufacturability7
6025-T4's machinability is fair (45/100, worse than 72% of aluminum grades); weldability very good (75/100); formability very good (72/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 6025-T4
Is 6025 easy to machine?
Machines like a medium-strength wrought aluminium — use polished-flute carbide, high rake and >300 m/min surface speeds with flood or MQL; soft O/H1x tempers tend to smear, so prefer H34 or T6 for fine finishes.
Can 6025 be welded?
Readily GTAW/GMAW welded with ER5356 (Mg-matched) filler; avoid 4043 with >2 % Mg base metal, and expect HAZ softening back toward O-temper strength in cold-worked tempers.
Can 6025 be formed, bent or molded?
Form in O/H111/T4 for tight radii; H34 and above need generous bend radii (≥3t) and may require warm forming, and heavily strained high-Mg material should be stabilized to avoid SCC sensitivity.
What surface finishes work on 6025?
Takes clear and colour sulphuric anodizing well and accepts chromate/chrome-free conversion coats and powder paint; bright decorative anodizing is limited by Mn/Cu constituent particles.
6025 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 |
|---|---|---|
| Siforms Mg2Si strengthening phase; limits not fully verified for this registration | 0.6 – 1.2 | 0.9 |
| Feimpurity | ≤ 0.5 | 0.25 |
| Custrength addition, slightly reduces corrosion resistance | 0.1 – 0.5 | 0.25 |
| Mngrain-structure control | 0.3 – 0.8 | 0.5 |
| Mgper AlMg2.5SiMnCu designation | 2 – 2.8 | 2.5 |
| Cr | ≤ 0.25 | — |
| Zn | ≤ 0.2 | — |
| Tigrain refiner | ≤ 0.1 | — |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Albalance; limits above are indicative of the AlMg2.5SiMnCu designation and should be confirmed against the governing purchase specification | balance | — |
6025-T4 — frequently asked
What is 6025-T4 used for?
6025-T4 is typically used for structural extrusions, machine frame and mounting brackets, load-bearing profiles and rails, welded frame assemblies, formed sheet brackets and gussets and transport and trailer structural sections. In short: higher-Mg structural 6000 series; weldable with 5356; lower conductivity than 6063.
What is the yield strength of 6025-T4?
6025-T4 has a typical yield strength of 140 MPa (20.3 ksi) and a tensile strength of 250 MPa (36.3 ksi) — weaker than 70% of aluminum grades. Strength varies by condition: see the 10 listed tempers.
Is 6025-T4 easy to machine?
Reasonably — machinability is rated fair (45/100, worse than 72% of aluminum grades). Machines like a medium-strength wrought aluminium — use polished-flute carbide, high rake and >300 m/min surface speeds with flood or MQL; soft O/H1x tempers tend to smear, so prefer H34 or T6 for fine finishes.
Can 6025-T4 be welded?
Yes — weldability is rated very good (75/100). Readily GTAW/GMAW welded with ER5356 (Mg-matched) filler; avoid 4043 with >2 % Mg base metal, and expect HAZ softening back toward O-temper strength in cold-worked tempers.
What surface finishes work on 6025-T4?
Takes clear and colour sulphuric anodizing well and accepts chromate/chrome-free conversion coats and powder paint; bright decorative anodizing is limited by Mn/Cu constituent particles.
Can 6025-T4 be formed, bent or molded?
Form in O/H111/T4 for tight radii; H34 and above need generous bend radii (≥3t) and may require warm forming, and heavily strained high-Mg material should be stabilized to avoid SCC sensitivity.
What is the maximum service temperature of 6025-T4?
6025-T4 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 6025-H32 and 6025-O?
H32 is the default condition — the general-purpose stocked sheet temper: balanced strength, formability and SCC stability for structural panels. O: pick for deep drawing, severe bending or when maximum ductility is needed before a forming step. Yield strength is 205 MPa in H32 versus 100 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 — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- EN 573-3 / EN 485-2 Aluminium and aluminium alloys — chemical composition and mechanical properties of sheet — 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.