Aluminum EN AC-71000 F-K
Heat-treated state
EN AC-71000 · ASTM 712.0
Choose for thinner sections and higher strength: chill casting refines the structure and raises UTS/hardness at similar ductility.
Values for the F-K condition
Other EN AC-71000 tempers and conditions
EN AC-71000 is listed in 4 conditions; see the grade overview at EN AC-71000.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
FDefault As fabricated | Standard supply condition: sand-cast and naturally aged for ~2–4 weeks; no solution treatment, best dimensional stability. | 145 | 215 | 4 | 62 HB | 30 % IACS |
Cooled from hot working and naturally aged | Chinese/GB practice for ZL401: hold the casting at room temperature (typically >10–30 days) so MgZn2 precipitation completes before machining. | 155 | 220 | 2.5 | 85 HB | 30 % IACS |
F-KThis page F | Choose for thinner sections and higher strength: chill casting refines the structure and raises UTS/hardness at similar ductility. | 160 | 235 | 4 | 70 HB | 30 % IACS |
Cooled from hot working and artificially aged | Optional short low-temperature age (roughly 140–170 °C) used by some foundries to accelerate and stabilise the natural-aging response before final machining. | 170 | 225 | 2 | 80 HB | 32 % IACS |
What is EN AC-71000 F-K?
EN AC-71000 F-K is EN AC-71000 heat treated to F-K — choose for thinner sections and higher strength: chill casting refines the structure and raises UTS/hardness at similar ductility. EN AC-71000 F-K has a yield strength of 160 MPa (23.2 ksi) and a tensile strength of 235 MPa (34.1 ksi) — weaker than 61% of aluminum grades. Elongation at break is 4% and the elastic modulus is 72 GPa (10.4 Msi). EN AC-71000 F-K has a density of 2.85 g/cm³ (0.103 lb/in³), heavier than 96% of aluminum grades. It melts at 550°C (1,022 °F). F is the default condition FabDigit quotes; F-K is available on request or by drawing note.
Advantages
- Easy to machine — 74/100, better than 85% of aluminum grades
Limitations
- Limited formability — 10/100, worse than 80% of aluminum grades
EN AC-71000 F-K properties
Typical room-temperature values for EN AC-71000 F-K; 22 are specific to this condition. Other listed values are EN AC-71000 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
EN AC-71000 F-K has a density of 2.85 g/cm³ (0.103 lb/in³), heavier than 96% of aluminum grades. It melts at 550°C (1,022 °F).
Mechanical14
EN AC-71000 F-K has a yield strength of 160 MPa (23.2 ksi) and a tensile strength of 235 MPa (34.1 ksi) — weaker than 61% of aluminum grades. Elongation at break is 4% and the elastic modulus is 72 GPa (10.4 Msi).
Thermal6
EN AC-71000 F-K is rated for continuous service to 150°C (302 °F). It conducts heat at 128 W/m·K (74 BTU/hr·ft·°F), worse than 69% of aluminum grades. Thermal expansion is 22.5 µm/m·K (12.5 µin/in·°F).
Electrical3
EN AC-71000 F-K conducts electricity at 30 % IACS, worse than 73% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 62% of aluminum grades.
Sustainability4
Producing a kilogram of EN AC-71000 F-K takes about 180 MJ of energy and emits 11.5 kg of CO₂ — less than 91% of aluminum grades. Typical recycled content is 60%.
Manufacturability8
EN AC-71000 F-K's machinability is very good (74/100, better than 85% of aluminum grades); weldability fair (40/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with EN AC-71000 F-K
Is EN AC-71000 easy to machine?
Machines cleanly with sharp polished carbide, high speed and low feed; dimensionally very stable after natural aging, so finish-machine only after the age is complete.
Can EN AC-71000 be welded?
TIG/MIG repair welding is possible with 5356 or matched Al-Zn-Mg filler but hot cracking and post-weld SCC risk are real — preheat lightly and avoid highly restrained joints.
Can EN AC-71000 be formed, bent or molded?
Sand or gravity permanent-mould casting with good feeding and moderate pouring temperature (≈690–720 °C); wide freezing range demands generous risers and chills to avoid shrinkage porosity and hot tears.
What surface finishes work on EN AC-71000?
Anodizes to a dull grey (decorative colour match poor); chromate/organic coating or paint is the usual protection, and impregnation may be needed for pressure-tight castings.
EN AC-71000 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 | 7.5 – 9.5 | 8.5 |
| Znwith Mg forms MgZn2 for self-hardening | 9 – 11 | 10 |
| Mg | 0.2 – 0.5 | 0.35 |
| Fe | ≤ 0.8 | — |
| Cu | ≤ 0.35 | — |
| Mn | ≤ 0.5 | — |
| Ni | ≤ 0.1 | — |
| Tigrain refiner | ≤ 0.25 | 0.1 |
| Pb | ≤ 0.1 | — |
| Sn | ≤ 0.05 | — |
| Others (each)total 0.25 max | ≤ 0.05 | — |
| Al | balance | — |
EN AC-71000 F-K — frequently asked
What is EN AC-71000 F-K used for?
EN AC-71000 F-K is typically used for molds and jigs, tooling plates and general castings requiring no heat treatment. In short: self-aging cast alloy; stable tooling-plate castings; no solution treatment needed.
What is the yield strength of EN AC-71000 F-K?
EN AC-71000 F-K has a typical yield strength of 160 MPa (23.2 ksi) and a tensile strength of 235 MPa (34.1 ksi) — weaker than 61% of aluminum grades. Strength varies by condition: see the 4 listed tempers.
Is EN AC-71000 F-K easy to machine?
Yes — machinability is rated very good (74/100, better than 85% of aluminum grades). Machines cleanly with sharp polished carbide, high speed and low feed; dimensionally very stable after natural aging, so finish-machine only after the age is complete.
Can EN AC-71000 F-K be welded?
With care — weldability is rated fair (40/100). TIG/MIG repair welding is possible with 5356 or matched Al-Zn-Mg filler but hot cracking and post-weld SCC risk are real — preheat lightly and avoid highly restrained joints.
What surface finishes work on EN AC-71000 F-K?
Anodizes to a dull grey (decorative colour match poor); chromate/organic coating or paint is the usual protection, and impregnation may be needed for pressure-tight castings.
Can EN AC-71000 F-K be formed, bent or molded?
Sand or gravity permanent-mould casting with good feeding and moderate pouring temperature (≈690–720 °C); wide freezing range demands generous risers and chills to avoid shrinkage porosity and hot tears.
What is the maximum service temperature of EN AC-71000 F-K?
EN AC-71000 F-K 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 EN AC-71000-F and EN AC-71000-T5?
F is the default condition — standard supply condition: sand-cast and naturally aged for ~2–4 weeks; no solution treatment, best dimensional stability. T5: optional short low-temperature age (roughly 140–170 °C) used by some foundries to accelerate and stabilise the natural-aging response before final machining. Yield strength is 145 MPa in F versus 170 MPa in T5.
Sources
- EN 1706 — Aluminium and aluminium alloys: castings, chemical composition and mechanical properties — CEN (2020)
- GB/T 1173 (ZL401 / ZAlZn11Si7) — SAC (2013)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- Aluminum Association Teal Sheets / registered casting alloy 712.0 data — The Aluminum Association (2015)
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.