Aluminum 444.0-T4
Temper · default condition
AA 444.0 · UNS A04440
T4 = solution heat treated and naturally aged
The standard commercial condition for 444.0: maximum ductility and impact/energy absorption with usable strength; pick it for parts that must deform rather than fracture.
Values for the T4 condition
Other 444.0 tempers and conditions
444.0 is listed in 2 conditions; see the grade overview at 444.0.
- 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 | The standard commercial condition for 444.0: maximum ductility and impact/energy absorption with usable strength; pick it for parts that must deform rather than fracture. | 62 | 145 | 12 | 44 HB | 37 % IACS |
As fabricated | Lowest cost condition; use when the part only needs castability and moderate ductility and no heat-treat cycle is justified. | 75 | 145 | 8 | 48 HB | 40 % IACS |
What is 444.0-T4?
444.0-T4 is 444.0 in the T4 temper — the standard commercial condition for 444.0: maximum ductility and impact/energy absorption with usable strength; pick it for parts that must deform rather than fracture. 444.0-T4 has a yield strength of 62 MPa (8.99 ksi) and a tensile strength of 145 MPa (21 ksi) — weaker than 93% of aluminum grades. Elongation at break is 12% and the elastic modulus is 71.5 GPa (10.4 Msi). 444.0-T4 has a density of 2.68 g/cm³ (0.0968 lb/in³), lighter than 72% of aluminum grades. It melts at 557°C (1,035 °F).
Limitations
- Low strength — 62 MPa (8.99 ksi), worse than 93% of aluminum grades
- Hard to polish — 45/100, worse than 76% of aluminum grades
444.0-T4 properties
Typical room-temperature values for 444.0-T4; 10 are specific to this condition. Other listed values are 444.0 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
444.0-T4 has a density of 2.68 g/cm³ (0.0968 lb/in³), lighter than 72% of aluminum grades. It melts at 557°C (1,035 °F).
Mechanical11
444.0-T4 has a yield strength of 62 MPa (8.99 ksi) and a tensile strength of 145 MPa (21 ksi) — weaker than 93% of aluminum grades. Elongation at break is 12% and the elastic modulus is 71.5 GPa (10.4 Msi).
Thermal6
444.0-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
444.0-T4 conducts electricity at 37 % IACS, better than 58% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), better than 62% of aluminum grades.
Sustainability4
Producing a kilogram of 444.0-T4 takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 40%.
Manufacturability7
444.0-T4's machinability is fair (50/100, worse than 65% of aluminum grades); weldability very good (75/100); formability poor (20/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 444.0-T4
Is 444.0 easy to machine?
Machines easily but gummy in T4 — use sharp polished-flute carbide (PCD for volume), high speed, low feed pressure and flood coolant to avoid built-up edge; eutectic Si is abrasive to HSS.
Can 444.0 be welded?
Readily GTAW/GMAW welded with 4043 or 4047 filler; since the alloy is not age hardenable, the weld/HAZ loses little relative strength, though ductility drops locally.
Can 444.0 be formed, bent or molded?
Permanent-mold (gravity die) casting alloy with excellent fluidity, low hot-tearing and good pressure tightness; degas and grain-refine the melt, and use directional solidification with chills for thick sections.
What surface finishes work on 444.0?
Chromate/phosphate conversion coating or paint is the usual protection; clear anodize turns grey and blotchy from the Si eutectic, hard anodize is acceptable for wear but not for cosmetics; polishing is limited by Si particles.
444.0 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 |
|---|---|---|
| Sieutectic former, gives fluidity | 6.5 – 7.5 | 7 |
| Femax; lower in B444.0 (0.20) | ≤ 0.6 | 0.3 |
| Cu | ≤ 0.25 | — |
| Mn | ≤ 0.35 | — |
| Mgdeliberately kept low — alloy is not age hardenable | ≤ 0.1 | — |
| Zn | ≤ 0.35 | — |
| Tigrain refinement | ≤ 0.25 | 0.12 |
| Others (each) | ≤ 0.05 | — |
| Others (total) | ≤ 0.15 | — |
| Al | balance | — |
444.0-T4 — frequently asked
What is 444.0-T4 used for?
444.0-T4 is typically used for automotive housings, instrument cases, structural sand castings requiring toughness and electrical enclosures. In short: ductile Al-7Si casting alloy; non-age-hardening, weld friendly; low-strength, high-elongation option.
What is the yield strength of 444.0-T4?
444.0-T4 has a typical yield strength of 62 MPa (8.99 ksi) and a tensile strength of 145 MPa (21 ksi) — weaker than 93% of aluminum grades. Strength varies by condition: see the 2 listed tempers.
Is 444.0-T4 easy to machine?
Reasonably — machinability is rated fair (50/100, worse than 65% of aluminum grades). Machines easily but gummy in T4 — use sharp polished-flute carbide (PCD for volume), high speed, low feed pressure and flood coolant to avoid built-up edge; eutectic Si is abrasive to HSS.
Can 444.0-T4 be welded?
Yes — weldability is rated very good (75/100). Readily GTAW/GMAW welded with 4043 or 4047 filler; since the alloy is not age hardenable, the weld/HAZ loses little relative strength, though ductility drops locally.
What surface finishes work on 444.0-T4?
Chromate/phosphate conversion coating or paint is the usual protection; clear anodize turns grey and blotchy from the Si eutectic, hard anodize is acceptable for wear but not for cosmetics; polishing is limited by Si particles.
Can 444.0-T4 be formed, bent or molded?
Permanent-mold (gravity die) casting alloy with excellent fluidity, low hot-tearing and good pressure tightness; degas and grain-refine the melt, and use directional solidification with chills for thick sections.
What is the maximum service temperature of 444.0-T4?
444.0-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 444.0-T4 and 444.0-F?
T4 is the default condition — the standard commercial condition for 444.0: maximum ductility and impact/energy absorption with usable strength; pick it for parts that must deform rather than fracture. F: lowest cost condition; use when the part only needs castability and moderate ductility and no heat-treat cycle is justified. Yield strength is 62 MPa in T4 versus 75 MPa in F.
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 / 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)
- ASM Specialty Handbook: Aluminum and Aluminum Alloys — ASM International (1993)
- UNS A04440 alloy data compilation — SAE/ASTM Unified Numbering System (2017)
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.