Aluminum EN AC-51400
EN AC-51400
EN AC-51400 (AlMg5(Si), ZL303) is a silicon-modified Al-Mg casting alloy in the EN 1706 family, used as-cast in sand (S-F) or permanent-mould (K-F) condition.
Reference datasheet — EN AC-51400 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 S-F condition
EN AC-51400 tempers and conditions
EN AC-51400 is supplied in 2 conditions, soft to hard. S-F 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 |
|---|---|---|---|---|---|---|
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 |
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?
EN AC-51400 (AlMg5(Si), ZL303) is a silicon-modified Al-Mg casting alloy in the EN 1706 family, used as-cast in sand (S-F) or permanent-mould (K-F) condition. The Si addition improves castability over plain AlMg5 while keeping high corrosion resistance (80/100) and a bright anodizing response, with typical values of 100 MPa yield, 160 MPa tensile, 3% elongation and 55 HB. Strength is modest, ductility low and service limited to 100 °C, and the long freezing range makes oxide films and shrinkage porosity a real risk. Where higher strength is needed, a heat-treatable Al-Si-Mg casting alloy is the usual alternative. EN AC-51400 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). EN AC-51400 has a yield strength of 100 MPa (14.5 ksi) and a tensile strength of 160 MPa (23.2 ksi) — weaker than 84% of aluminum grades. Elongation at break is 3% and the elastic modulus is 70 GPa (10.2 Msi).
What is EN AC-51400 used for?
- decorative castings
- marine parts
- housings
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
Limitations
- Limited service temperature — 100°C (212 °F), worse than 91% of aluminum grades
- Low strength — 100 MPa (14.5 ksi), worse than 84% of aluminum grades
- Poor heat conductor — 120 W/m·K (69.3 BTU/hr·ft·°F), worse than 80% of aluminum grades
- Limited ductility — 3%, worse than 79% of aluminum grades
- Low electrical conductivity — 29 % IACS, worse than 78% of aluminum grades
EN AC-51400 properties
Typical room-temperature values for EN AC-51400-S-F; bars are the position among aluminum grades.
Physical3
EN AC-51400 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 has a yield strength of 100 MPa (14.5 ksi) and a tensile strength of 160 MPa (23.2 ksi) — weaker than 84% of aluminum grades. Elongation at break is 3% and the elastic modulus is 70 GPa (10.2 Msi).
Thermal6
EN AC-51400 is rated for continuous service to 100°C (212 °F). It conducts heat at 120 W/m·K (69.3 BTU/hr·ft·°F), worse than 80% of aluminum grades. Thermal expansion is 24.5 µm/m·K (13.6 µin/in·°F).
Electrical3
EN AC-51400 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 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's machinability is very good (70/100, better than 72% of aluminum grades); weldability very good (75/100).
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. EN AC-51400 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with EN AC-51400
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.
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 |
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.
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 EN AC-51400 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- AC-51400
- Similar grades
- ZL303
How much does EN AC-51400 cost?
EN AC-51400 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.
EN AC-51400 — frequently asked
What is EN AC-51400 used for?
EN AC-51400 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?
EN AC-51400 has a typical yield strength of 100 MPa (14.5 ksi) and a tensile strength of 160 MPa (23.2 ksi) — weaker than 84% of aluminum grades. Strength varies by condition: see the 2 listed tempers.
Is EN AC-51400 easy to machine?
Yes — machinability is rated very good (70/100, better than 72% 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 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?
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 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?
EN AC-51400 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.
How much does EN AC-51400 cost?
EN AC-51400 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
- 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; 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.