Aluminum A444.0-T4
Temper · default condition
AA A444.0 · UNS A14440
T4 = solution heat treated and naturally aged
Standard commercial condition: solution treatment spheroidizes the eutectic silicon, maximizing elongation and impact/energy absorption.
Values for the T4 condition
Other A444.0 tempers and conditions
A444.0 is listed in 2 conditions; see the grade overview at A444.0.
- T4
- F
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
T4DefaultThis page Solution heat treated and naturally aged | Standard commercial condition: solution treatment spheroidizes the eutectic silicon, maximizing elongation and impact/energy absorption. | 62 | 159 | 21 | 44 HB | 41 % IACS |
As fabricated | Pick when the casting is used as-cast and moderate ductility is enough; lowest cost. | 76 | 145 | 13 | 44 HB | 42 % IACS |
What is A444.0-T4?
A444.0-T4 is A444.0 in the T4 temper — standard commercial condition: solution treatment spheroidizes the eutectic silicon, maximizing elongation and impact/energy absorption. A444.0-T4 has a yield strength of 62 MPa (8.99 ksi) and a tensile strength of 159 MPa (23.1 ksi) — weaker than 93% of aluminum grades. Elongation at break is 21% and the elastic modulus is 71 GPa (10.3 Msi). A444.0-T4 has a density of 2.68 g/cm³ (0.0968 lb/in³), lighter than 72% of aluminum grades. It melts at 577°C (1,071 °F).
Advantages
- Ductile — tolerates forming and impact — 21%, better than 91% of aluminum grades
- High electrical conductivity — 41 % IACS, better than 78% of aluminum grades
- Readily welded — 82/100, better than 76% of aluminum grades
Limitations
- Low strength — 62 MPa (8.99 ksi), worse than 93% of aluminum grades
A444.0-T4 properties
Typical room-temperature values for A444.0-T4; 11 are specific to this condition. Other listed values are A444.0 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
A444.0-T4 has a density of 2.68 g/cm³ (0.0968 lb/in³), lighter than 72% of aluminum grades. It melts at 577°C (1,071 °F).
Mechanical12
A444.0-T4 has a yield strength of 62 MPa (8.99 ksi) and a tensile strength of 159 MPa (23.1 ksi) — weaker than 93% of aluminum grades. Elongation at break is 21% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
A444.0-T4 is rated for continuous service to 150°C (302 °F). It conducts heat at 151 W/m·K (87.2 BTU/hr·ft·°F), better than 63% of aluminum grades. Thermal expansion is 21.5 µm/m·K (11.9 µin/in·°F).
Electrical3
A444.0-T4 conducts electricity at 41 % IACS, better than 78% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), better than 57% of aluminum grades.
Sustainability4
Producing a kilogram of A444.0-T4 takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 55%.
Manufacturability7
A444.0-T4's machinability is fair (50/100, worse than 65% of aluminum grades); weldability very good (82/100); formability fair (35/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with A444.0-T4
Is A444.0 easy to machine?
Very soft and gummy — use sharp polished-flute carbide, high speed, generous rake and flood coolant or MQL to avoid built-up edge and torn threads.
Can A444.0 be welded?
Readily GTAW/GMAW welded with 4043 filler; repair welds need no post-weld heat treatment since the alloy is not precipitation strengthened.
Can A444.0 be formed, bent or molded?
Excellent fluidity for permanent-mold (and sand) casting with Sr/Na modification and Ti grain refinement; unusually tolerant of straightening or local bending after casting.
What surface finishes work on A444.0?
Takes conversion coating and paint well; anodizing is protective but grey/mottled from eutectic silicon; polishing limited by Si particles.
A444.0 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 |
|---|---|---|
| Si | 6.5 – 7.5 | 7 |
| Felow-Fe 'A' variant of 444.0 | ≤ 0.2 | 0.12 |
| Cu | ≤ 0.1 | 0.03 |
| Mn | ≤ 0.1 | 0.03 |
| Mgkept low deliberately — no age hardening | ≤ 0.05 | 0.01 |
| Zn | ≤ 0.1 | 0.03 |
| Tigrain refiner | ≤ 0.2 | 0.12 |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
A444.0-T4 — frequently asked
What is A444.0-T4 used for?
A444.0-T4 is typically used for marine fittings, appliance parts and low-stress structural castings. In short: highest-ductility Al-Si casting; no heat treatment needed; low strength, high impact.
What is the yield strength of A444.0-T4?
A444.0-T4 has a typical yield strength of 62 MPa (8.99 ksi) and a tensile strength of 159 MPa (23.1 ksi) — weaker than 93% of aluminum grades. Strength varies by condition: see the 2 listed tempers.
Is A444.0-T4 easy to machine?
Reasonably — machinability is rated fair (50/100, worse than 65% of aluminum grades). Very soft and gummy — use sharp polished-flute carbide, high speed, generous rake and flood coolant or MQL to avoid built-up edge and torn threads.
Can A444.0-T4 be welded?
Yes — weldability is rated very good (82/100). Readily GTAW/GMAW welded with 4043 filler; repair welds need no post-weld heat treatment since the alloy is not precipitation strengthened.
What surface finishes work on A444.0-T4?
Takes conversion coating and paint well; anodizing is protective but grey/mottled from eutectic silicon; polishing limited by Si particles.
Can A444.0-T4 be formed, bent or molded?
Excellent fluidity for permanent-mold (and sand) casting with Sr/Na modification and Ti grain refinement; unusually tolerant of straightening or local bending after casting.
What is the maximum service temperature of A444.0-T4?
A444.0-T4 is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between A444.0-T4 and A444.0-F?
T4 is the default condition — standard commercial condition: solution treatment spheroidizes the eutectic silicon, maximizing elongation and impact/energy absorption. F: pick when the casting is used as-cast and moderate ductility is enough; lowest cost. Yield strength is 62 MPa in T4 versus 76 MPa in F.
Sources
- Designations and Chemical Composition Limits for Aluminum Alloys in the Form of Castings and Ingot (Teal Sheets) — The Aluminum Association (2018)
- ASTM B108 / B108M — Aluminum-Alloy Permanent Mold Castings — ASTM International (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- Aluminum and Aluminum Alloys (ASM Specialty Handbook) — ASM International (1993)
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.