Aluminum ADC3-T7
Temper
JIS ADC3
T7 = solution heat treated and overaged (stabilized)
Overaged condition for dimensional stability and better ductility at elevated service temperature, at some loss of strength versus T6.
Values for the T7 condition
Other ADC3 tempers and conditions
ADC3 is listed in 5 conditions; see the grade overview at ADC3.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
F | Pick when the casting must be weldable, riveted/self-pierce joined, or later heat treated — vacuum-assisted casting cuts entrapped gas. | 160 | 300 | 8 | 72 HB | 29 % IACS |
FDefault As fabricated | Standard supply condition for high-pressure die castings; use unless heat treatment or dimensional stabilisation is specified. | 170 | 315 | 3.5 | 75 HB | 29 % IACS |
T7This page Solution heat treated and overaged (stabilized) | Overaged condition for dimensional stability and better ductility at elevated service temperature, at some loss of strength versus T6. | 190 | 260 | 6 | 78 HB | 38 % IACS |
Cooled from hot working and artificially aged | Low-temperature ageing (~180–200 °C) to stabilise dimensions and add a little strength without blistering the casting. | 200 | 320 | 2.5 | 85 HB | 31 % IACS |
Solution heat treated and artificially aged | Maximum strength; only practical on vacuum/squeeze/low-pressure castings or gravity permanent-mould parts — conventional die castings blister at solution temperature. | 260 | 330 | 3 | 95 HB | 37 % IACS |
What is ADC3-T7?
ADC3-T7 is ADC3 in the T7 temper — overaged condition for dimensional stability and better ductility at elevated service temperature, at some loss of strength versus T6. ADC3-T7 has a yield strength of 190 MPa (27.6 ksi) and a tensile strength of 260 MPa (37.7 ksi) — weaker than 52% of aluminum grades. Elongation at break is 6% and the elastic modulus is 71 GPa (10.3 Msi). ADC3-T7 has a density of 2.64 g/cm³ (0.0954 lb/in³), lighter than 94% of aluminum grades. It melts at 557°C (1,035 °F). F is the default condition FabDigit quotes; T7 is available on request or by drawing note.
Advantages
- High service temperature — 200°C (392 °F), better than 90% of aluminum grades
Limitations
- Hard to polish — 45/100, worse than 76% of aluminum grades
ADC3-T7 properties
Typical room-temperature values for ADC3-T7; 20 are specific to this condition. Other listed values are ADC3 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
ADC3-T7 has a density of 2.64 g/cm³ (0.0954 lb/in³), lighter than 94% of aluminum grades. It melts at 557°C (1,035 °F).
Mechanical13
ADC3-T7 has a yield strength of 190 MPa (27.6 ksi) and a tensile strength of 260 MPa (37.7 ksi) — weaker than 52% of aluminum grades. Elongation at break is 6% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
ADC3-T7 is rated for continuous service to 200°C (392 °F). It conducts heat at 148 W/m·K (85.5 BTU/hr·ft·°F), better than 56% of aluminum grades. Thermal expansion is 21 µm/m·K (11.7 µin/in·°F).
Electrical3
ADC3-T7 conducts electricity at 38 % IACS, better than 61% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 71% of aluminum grades.
Sustainability4
Producing a kilogram of ADC3-T7 takes about 180 MJ of energy and emits 11.5 kg of CO₂ — less than 91% of aluminum grades. Typical recycled content is 85%.
Manufacturability7
ADC3-T7's machinability is good (59/100, worse than 52% of aluminum grades); weldability fair (42/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ADC3-T7
Is ADC3 easy to machine?
Machines freely with sharp PCD or polished-flute carbide tooling at high speed and copious coolant; the 9–10 % Si is abrasive, so PCD is preferred for volume work, and skin porosity can open up on pressure faces.
Can ADC3 be welded?
TIG/MIG possible with 4043 or 4047 filler only on vacuum/low-gas castings; conventional die castings blister and porosity-crack — prefer mechanical joining, FSW or adhesive bonding.
Can ADC3 be formed, bent or molded?
High-pressure die cast at ~660–700 °C melt with fast fill; fluidity is a little lower and hot-tearing/die-soldering tendency higher than ADC12, so generous fillets, controlled Fe and good die lubrication are needed.
What surface finishes work on ADC3?
Chromate/trivalent conversion coating, e-coat or powder coat gives the best appearance; anodizing is dark and mottled because of primary Si, and shot blast plus vibratory polish is used for as-cast cosmetic parts.
ADC3 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 |
|---|---|---|
| SiJIS H 5302 ADC3 / ASTM A360.0 | 9 – 10 | 9.5 |
| Mgstrengthening addition | 0.4 – 0.6 | 0.5 |
| Femax; controls die soldering | ≤ 1.3 | 0.9 |
| Cumax; kept low for corrosion resistance | ≤ 0.6 | 0.15 |
| Mn | ≤ 0.3 | 0.15 |
| Zn | ≤ 0.5 | 0.1 |
| Ni | ≤ 0.5 | 0.05 |
| Sn | ≤ 0.1 | 0.02 |
| Al | balance | — |
ADC3-T7 — frequently asked
What is ADC3-T7 used for?
ADC3-T7 is typically used for electronics enclosures, automotive brackets and power tool housings. In short: more ductile than ADC12; copper-free die casting alloy; better corrosion than ADC10.
What is the yield strength of ADC3-T7?
ADC3-T7 has a typical yield strength of 190 MPa (27.6 ksi) and a tensile strength of 260 MPa (37.7 ksi) — weaker than 52% of aluminum grades. Strength varies by condition: see the 5 listed tempers.
Is ADC3-T7 easy to machine?
Reasonably — machinability is rated good (59/100, worse than 52% of aluminum grades). Machines freely with sharp PCD or polished-flute carbide tooling at high speed and copious coolant; the 9–10 % Si is abrasive, so PCD is preferred for volume work, and skin porosity can open up on pressure faces.
Can ADC3-T7 be welded?
With care — weldability is rated fair (42/100). TIG/MIG possible with 4043 or 4047 filler only on vacuum/low-gas castings; conventional die castings blister and porosity-crack — prefer mechanical joining, FSW or adhesive bonding.
What surface finishes work on ADC3-T7?
Chromate/trivalent conversion coating, e-coat or powder coat gives the best appearance; anodizing is dark and mottled because of primary Si, and shot blast plus vibratory polish is used for as-cast cosmetic parts.
Can ADC3-T7 be formed, bent or molded?
High-pressure die cast at ~660–700 °C melt with fast fill; fluidity is a little lower and hot-tearing/die-soldering tendency higher than ADC12, so generous fillets, controlled Fe and good die lubrication are needed.
What is the maximum service temperature of ADC3-T7?
ADC3-T7 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ADC3-F and ADC3-T6?
F is the default condition — standard supply condition for high-pressure die castings; use unless heat treatment or dimensional stabilisation is specified. T6: maximum strength; only practical on vacuum/squeeze/low-pressure castings or gravity permanent-mould parts — conventional die castings blister at solution temperature. Yield strength is 170 MPa in F versus 260 MPa in T6.
Sources
- JIS H 5302 — Aluminium alloy die castings — JSA (2006)
- ASTM B85/B85M — Aluminum-Alloy Die Castings (A360.0) — ASTM (2018)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Aluminum Association Teal Sheets — Registration Record of Casting Alloys — The Aluminum Association (2015)
- NADCA Product Specification Standards for Die Castings — NADCA (2018)
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.