Aluminum EN AC-51400 K-F
Temper
EN AC-51400
K-F = permanent (chill) mould cast, as-cast
Pick for series parts needing tighter dimensions and ~10–15 % higher strength from the faster-solidifying chill mould.
Values for the K-F condition
Other EN AC-51400 tempers and conditions
EN AC-51400 is listed in 2 conditions; see the grade overview at EN AC-51400.
- S-F
- K-F
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
S-FDefault Sand cast, as-cast | Standard supply condition for marine hardware, fittings and decorative sand castings; no heat treatment needed. | 100 | 160 | 3 | 55 HB | 29 % IACS |
K-FThis page Permanent (chill) mould cast, as-cast | Pick for series parts needing tighter dimensions and ~10–15 % higher strength from the faster-solidifying chill mould. | 110 | 180 | 4 | 60 HB | 29 % IACS |
What is EN AC-51400 K-F?
EN AC-51400 K-F is EN AC-51400 in the K-F temper — pick for series parts needing tighter dimensions and ~10–15 % higher strength from the faster-solidifying chill mould. EN AC-51400 K-F has a yield strength of 110 MPa (16 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 81% of aluminum grades. Elongation at break is 4% and the elastic modulus is 70 GPa (10.2 Msi). EN AC-51400 K-F has a density of 2.61 g/cm³ (0.0943 lb/in³), lighter than 97% of aluminum grades. It melts at 570°C (1,058 °F). S-F is the default condition FabDigit quotes; K-F is available on request or by drawing note.
Advantages
- Good corrosion resistance — 80/100, better than 97% of aluminum grades
- Polishes to a fine finish — 80/100, better than 93% of aluminum grades
- Easy to machine — 72/100, better than 80% of aluminum grades
Limitations
- Limited service temperature — 100°C (212 °F), worse than 91% of aluminum grades
- Low strength — 110 MPa (16 ksi), worse than 81% of aluminum grades
- Low electrical conductivity — 29 % IACS, worse than 78% of aluminum grades
EN AC-51400 K-F properties
Typical room-temperature values for EN AC-51400 K-F; 11 are specific to this condition. Other listed values are EN AC-51400 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
EN AC-51400 K-F has a density of 2.61 g/cm³ (0.0943 lb/in³), lighter than 97% of aluminum grades. It melts at 570°C (1,058 °F).
Mechanical10
EN AC-51400 K-F has a yield strength of 110 MPa (16 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 81% of aluminum grades. Elongation at break is 4% and the elastic modulus is 70 GPa (10.2 Msi).
Thermal6
EN AC-51400 K-F is rated for continuous service to 100°C (212 °F). It conducts heat at 122 W/m·K (70.5 BTU/hr·ft·°F), worse than 74% of aluminum grades. Thermal expansion is 24.5 µm/m·K (13.6 µin/in·°F).
Electrical3
EN AC-51400 K-F conducts electricity at 29 % IACS, worse than 78% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is very good (80/100), better than 97% of aluminum grades.
Sustainability4
Producing a kilogram of EN AC-51400 K-F takes about 155 MJ of energy and emits 12 kg of CO₂ — less than 94% of aluminum grades. Typical recycled content is 30%.
Manufacturability6
EN AC-51400 K-F's machinability is very good (72/100, better than 80% of aluminum grades); weldability very good (75/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with EN AC-51400 K-F
Is EN AC-51400 easy to machine?
Machines cleanly with sharp positive-rake carbide tools and generous coolant; Al-Mg is gummy, so use high speed, polished flutes and chip evacuation to avoid built-up edge.
Can EN AC-51400 be welded?
Readily TIG/MIG welded with 5356 or 5183 filler; clean oxide thoroughly, preheat only lightly and avoid Si-rich 4043 filler which embrittles high-Mg joints.
Can EN AC-51400 be formed, bent or molded?
Cast only — melt under cover/flux with low turbulence and good degassing; keep pouring temperature ~700–730 °C and use chills/generous feeders since long-freezing Al-Mg is prone to oxide films and shrinkage porosity.
What surface finishes work on EN AC-51400?
Best-in-class anodizing and polishing among cast Al alloys; also takes chemical conversion coating and paint well, but is a poor brazing substrate.
EN AC-51400 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 |
|---|---|---|
| Sideliberate addition to raise fluidity | 0.8 – 1.3 | 1 |
| Fe | ≤ 0.55 | — |
| Cumax, kept low for corrosion resistance | ≤ 0.1 | — |
| Mn | ≤ 0.45 | — |
| Mg | 4.5 – 6.5 | 5.2 |
| Zn | ≤ 0.1 | — |
| Tigrain refiner | ≤ 0.2 | — |
| Pb | ≤ 0.05 | — |
| Sn | ≤ 0.05 | — |
| Others (each / total)0.05 each, 0.15 total | ≤ 0.15 | — |
| Al | balance | — |
EN AC-51400 K-F — frequently asked
What is EN AC-51400 K-F used for?
EN AC-51400 K-F is typically used for decorative castings, marine parts and housings. In short: best-anodizing cast aluminum; marine-grade Al-Mg casting; no heat treatment required.
What is the yield strength of EN AC-51400 K-F?
EN AC-51400 K-F has a typical yield strength of 110 MPa (16 ksi) and a tensile strength of 180 MPa (26.1 ksi) — weaker than 81% of aluminum grades. Strength varies by condition: see the 2 listed tempers.
Is EN AC-51400 K-F easy to machine?
Yes — machinability is rated very good (72/100, better than 80% of aluminum grades). Machines cleanly with sharp positive-rake carbide tools and generous coolant; Al-Mg is gummy, so use high speed, polished flutes and chip evacuation to avoid built-up edge.
Can EN AC-51400 K-F be welded?
Yes — weldability is rated very good (75/100). Readily TIG/MIG welded with 5356 or 5183 filler; clean oxide thoroughly, preheat only lightly and avoid Si-rich 4043 filler which embrittles high-Mg joints.
What surface finishes work on EN AC-51400 K-F?
Best-in-class anodizing and polishing among cast Al alloys; also takes chemical conversion coating and paint well, but is a poor brazing substrate.
Can EN AC-51400 K-F be formed, bent or molded?
Cast only — melt under cover/flux with low turbulence and good degassing; keep pouring temperature ~700–730 °C and use chills/generous feeders since long-freezing Al-Mg is prone to oxide films and shrinkage porosity.
What is the maximum service temperature of EN AC-51400 K-F?
EN AC-51400 K-F is rated for continuous use to about 100°C (212 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between EN AC-51400 S-F and EN AC-51400 K-F?
S-F is the default condition — standard supply condition for marine hardware, fittings and decorative sand castings; no heat treatment needed. K-F: pick for series parts needing tighter dimensions and ~10–15 % higher strength from the faster-solidifying chill mould. Yield strength is 100 MPa in S-F versus 110 MPa in K-F.
Sources
- EN 1706 — Aluminium and aluminium alloys: castings, chemical composition and mechanical properties — CEN (2020)
- GB/T 1173 (ZL303 / ZAlMg5Si1) — SAC (2013)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
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.