Aluminum 444.0
AA 444.0 · UNS A04440
444.0 is a higher-purity Al-7Si casting alloy related to the 356 family but with no magnesium addition, supplied as-cast F or solution heat treated to T4 (A04440).
Reference datasheet — 444.0 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 T4 condition
444.0 tempers and conditions
444.0 is supplied in 2 conditions, soft to hard. T4 is the default FabDigit quotes; the values on this page are for it.
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
T4Default 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?
444.0 is a higher-purity Al-7Si casting alloy related to the 356 family but with no magnesium addition, supplied as-cast F or solution heat treated to T4 (A04440). Because it is not age hardenable, it keeps 12% elongation and shock resistance at 62 MPa yield, 145 MPa tensile, 44 HB and 151 W/m·K, which suits permanent-mold and sand castings that must absorb impact rather than carry high stress. Strength is low, so it is not a substitute for A356-T6 in load-bearing parts, service is limited to about 150 °C and clear anodizing is grey from the silicon eutectic. 444.0 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). 444.0 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).
What is 444.0 used for?
- automotive housings
- instrument cases
- structural sand castings requiring toughness
- electrical enclosures
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 properties
Typical room-temperature values for 444.0-T4; bars are the position among aluminum grades.
Physical3
444.0 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 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 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 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 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'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. 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. 444.0 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 444.0
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.
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 |
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.
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 444.0 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- A04440
How much does 444.0 cost?
444.0 is a standard-cost aluminum ($$), cheaper than about 71% 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.
444.0 — frequently asked
What is 444.0 used for?
444.0 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?
444.0 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 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 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?
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 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?
444.0 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.
How much does 444.0 cost?
444.0 is a standard-cost aluminum ($$), cheaper than about 71% 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 / 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; 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.