Aluminum EN AC-71100-T5
Temper
EN AC-71100
T5 = cooled from hot working and artificially aged
Short low-temperature age (typ. ~2–5 h at 130–160 °C) used to reach stable T1-level properties in hours instead of weeks.
Values for the T5 condition
Other EN AC-71100 tempers and conditions
EN AC-71100 is listed in 3 conditions; see the grade overview at EN AC-71100.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Freshly cast condition; use when parts are machined immediately after casting and full self-hardening has not yet developed. | 150 | 230 | 2 | 70 HB | 28 % IACS |
T1Default Cooled from hot working and naturally aged | Standard supply condition: after 2–4 weeks at room temperature the alloy self-hardens, giving maximum strength with no solution treatment or quench distortion. | 205 | 270 | 1.5 | 90 HB | 27 % IACS |
T5This page Cooled from hot working and artificially aged | Short low-temperature age (typ. ~2–5 h at 130–160 °C) used to reach stable T1-level properties in hours instead of weeks. | 215 | 275 | 1.2 | 95 HB | 26 % IACS |
What is EN AC-71100-T5?
EN AC-71100-T5 is EN AC-71100 in the T5 temper — short low-temperature age (typ. ~2–5 h at 130–160 °C) used to reach stable T1-level properties in hours instead of weeks. EN AC-71100-T5 has a yield strength of 215 MPa (31.2 ksi) and a tensile strength of 275 MPa (39.9 ksi) — stronger than 58% of aluminum grades. Elongation at break is 1.2% and the elastic modulus is 71 GPa (10.3 Msi). EN AC-71100-T5 has a density of 2.9 g/cm³ (0.105 lb/in³), heavier than 98% of aluminum grades. It melts at 550°C (1,022 °F). T1 is the default condition FabDigit quotes; T5 is available on request or by drawing note.
Advantages
- Easy to machine — 73/100, better than 85% of aluminum grades
Limitations
- Limited formability — 4/100, worse than 99% of aluminum grades
- Low fracture toughness — 14 MPa·√m (12.7 ksi·√in), worse than 97% of aluminum grades
- Limited ductility — 1.2%, worse than 93% of aluminum grades
- Poor heat conductor — 108 W/m·K (62.4 BTU/hr·ft·°F), worse than 90% of aluminum grades
- Low electrical conductivity — 26 % IACS, worse than 90% of aluminum grades
EN AC-71100-T5 properties
Typical room-temperature values for EN AC-71100-T5; 21 are specific to this condition. Other listed values are EN AC-71100 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
EN AC-71100-T5 has a density of 2.9 g/cm³ (0.105 lb/in³), heavier than 98% of aluminum grades. It melts at 550°C (1,022 °F).
Mechanical15
EN AC-71100-T5 has a yield strength of 215 MPa (31.2 ksi) and a tensile strength of 275 MPa (39.9 ksi) — stronger than 58% of aluminum grades. Elongation at break is 1.2% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
EN AC-71100-T5 is rated for continuous service to 160°C (320 °F). It conducts heat at 108 W/m·K (62.4 BTU/hr·ft·°F), worse than 90% of aluminum grades. Thermal expansion is 21.5 µm/m·K (11.9 µin/in·°F).
Electrical3
EN AC-71100-T5 conducts electricity at 26 % IACS, worse than 90% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (40/100), worse than 75% of aluminum grades.
Sustainability4
Producing a kilogram of EN AC-71100-T5 takes about 190 MJ of energy and emits 11.5 kg of CO₂ — less than 89% of aluminum grades. Typical recycled content is 50%.
Manufacturability8
EN AC-71100-T5's machinability is very good (73/100, better than 85% of aluminum grades); weldability poor (20/100); formability not recommended (4/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with EN AC-71100-T5
Is EN AC-71100 easy to machine?
Machines freely with sharp carbide or PCD tooling and high speeds; Si particles cause abrasive wear, and the naturally aged state machines cleaner than the soft as-cast state.
Can EN AC-71100 be welded?
Essentially unweldable by fusion methods — die-cast gas porosity blisters and the high Zn volatilizes; use mechanical fastening or adhesive bonding.
Can EN AC-71100 be formed, bent or molded?
High-pressure die casting alloy with good fluidity at 8 % Si; keep dies at 180–250 °C, avoid heavy sections and slow fill to limit hot tearing and shrink porosity.
What surface finishes work on EN AC-71100?
Take chromate-free conversion coating, powder coat or paint; anodizing gives dark, uneven films, so decorative clear anodize is not recommended (hard anodize is workable).
EN AC-71100 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 | 7.5 – 9.5 | 8.5 |
| Znprovides natural-aging (self-hardening) response with Mg | 9 – 11 | 10 |
| Mg | 0.2 – 0.5 | 0.35 |
| Fedie-cast limit; lower for gravity casting | ≤ 1.3 | — |
| Cu | ≤ 0.35 | — |
| Mn | ≤ 0.5 | — |
| Ti | ≤ 0.25 | — |
| Ni | ≤ 0.05 | — |
| Pb | ≤ 0.1 | — |
| Sn | ≤ 0.05 | — |
| Others (each)total ≤ 0.15 | ≤ 0.05 | — |
| Al | balance | — |
EN AC-71100-T5 — frequently asked
What is EN AC-71100-T5 used for?
EN AC-71100-T5 is typically used for die-cast housings, automotive components and general-purpose castings requiring natural aging. In short: self-ageing die-cast alloy; no solution treatment required; not fusion weldable.
What is the yield strength of EN AC-71100-T5?
EN AC-71100-T5 has a typical yield strength of 215 MPa (31.2 ksi) and a tensile strength of 275 MPa (39.9 ksi) — stronger than 58% of aluminum grades. Strength varies by condition: see the 3 listed tempers.
Is EN AC-71100-T5 easy to machine?
Yes — machinability is rated very good (73/100, better than 85% of aluminum grades). Machines freely with sharp carbide or PCD tooling and high speeds; Si particles cause abrasive wear, and the naturally aged state machines cleaner than the soft as-cast state.
Can EN AC-71100-T5 be welded?
Not readily — weldability is rated poor (20/100). Essentially unweldable by fusion methods — die-cast gas porosity blisters and the high Zn volatilizes; use mechanical fastening or adhesive bonding.
What surface finishes work on EN AC-71100-T5?
Take chromate-free conversion coating, powder coat or paint; anodizing gives dark, uneven films, so decorative clear anodize is not recommended (hard anodize is workable).
Can EN AC-71100-T5 be formed, bent or molded?
High-pressure die casting alloy with good fluidity at 8 % Si; keep dies at 180–250 °C, avoid heavy sections and slow fill to limit hot tearing and shrink porosity.
What is the maximum service temperature of EN AC-71100-T5?
EN AC-71100-T5 is rated for continuous use to about 160°C (320 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between EN AC-71100-T1 and EN AC-71100-F?
T1 is the default condition — standard supply condition: after 2–4 weeks at room temperature the alloy self-hardens, giving maximum strength with no solution treatment or quench distortion. F: freshly cast condition; use when parts are machined immediately after casting and full self-hardening has not yet developed. Yield strength is 205 MPa in T1 versus 150 MPa in F.
Sources
- EN 1706 — Aluminium and aluminium alloys — Castings — Chemical composition and mechanical properties — CEN (2020)
- EN 1780-1/-2 — Designation of alloyed aluminium ingots for remelting — CEN (2002)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 15 — Casting — ASM International (2008)
- European die-casting alloy ingot datasheets (AlZn10Si8Mg self-hardening alloy) — EU secondary aluminium producers (2022)
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.