Aluminum EN AC-51100
EN AC-51100
EN AC-51100 (AlMg3, G-AlMg3) is a non-heat-treatable Al-Mg sand and gravity casting alloy in the EN 1706 family, supplied as S-F, K-F or S-O, with corrosion resistance from magnesium in solid solution rather than from precipitates.
Reference datasheet — EN AC-51100 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-51100 tempers and conditions
EN AC-51100 is supplied in 3 conditions, soft to hard. S-F is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Sand cast, stress relieved / stabilizing anneal | Use when dimensional stability after machining or maximum stress-corrosion safety is required; slightly lower strength, higher elongation. | 70 | 145 | 6 | 47 HB | 25 % IACS |
S-FDefault Sand cast, as-cast | Standard supply condition for marine fittings and housings cast in sand moulds. | 80 | 150 | 4 | 50 HB | 25 % IACS |
Permanent (gravity die) cast, as-cast | Choose for higher-volume die-cast-quality parts; faster solidification gives finer structure and slightly better ductility. | 80 | 160 | 5 | 50 HB | 25 % IACS |
What is EN AC-51100?
EN AC-51100 (AlMg3, G-AlMg3) is a non-heat-treatable Al-Mg sand and gravity casting alloy in the EN 1706 family, supplied as S-F, K-F or S-O, with corrosion resistance from magnesium in solid solution rather than from precipitates. It is used where seawater and marine exposure matter, and where anodized or polished cast surfaces are required, giving 150 MPa tensile, 80 MPa yield, 4% elongation, 50 HB and 145 W/m·K. Casting is the constraint: fluidity is poor, oxide and hot-tear tendency high, service temperature limited to about 120 °C. EN AC-51300 AlMg5 is the next step up in strength. EN AC-51100 has a density of 2.66 g/cm³ (0.0961 lb/in³), lighter than 84% of aluminum grades. It melts at 600°C (1,112 °F). EN AC-51100 has a yield strength of 80 MPa (11.6 ksi) and a tensile strength of 150 MPa (21.8 ksi) — weaker than 90% of aluminum grades. Elongation at break is 4% and the elastic modulus is 70 GPa (10.2 Msi).
What is EN AC-51100 used for?
- marine fittings
- decorative castings
- food equipment
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
- Low electrical conductivity — 25 % IACS, worse than 92% of aluminum grades
- Low strength — 80 MPa (11.6 ksi), worse than 90% of aluminum grades
- Limited service temperature — 120°C (248 °F), worse than 79% of aluminum grades
EN AC-51100 properties
Typical room-temperature values for EN AC-51100-S-F; bars are the position among aluminum grades.
Physical3
EN AC-51100 has a density of 2.66 g/cm³ (0.0961 lb/in³), lighter than 84% of aluminum grades. It melts at 600°C (1,112 °F).
Mechanical12
EN AC-51100 has a yield strength of 80 MPa (11.6 ksi) and a tensile strength of 150 MPa (21.8 ksi) — weaker than 90% of aluminum grades. Elongation at break is 4% and the elastic modulus is 70 GPa (10.2 Msi).
Thermal6
EN AC-51100 is rated for continuous service to 120°C (248 °F). It conducts heat at 145 W/m·K (83.8 BTU/hr·ft·°F), better than 53% of aluminum grades. Thermal expansion is 24 µm/m·K (13.3 µin/in·°F).
Electrical3
EN AC-51100 conducts electricity at 25 % IACS, worse than 92% 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-51100 takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 45%.
Manufacturability8
EN AC-51100's machinability is very good (70/100, better than 72% of aluminum grades); weldability very good (80/100); formability poor (15/100).
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-51100 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with EN AC-51100
Is EN AC-51100 easy to machine?
Machines freely with sharp polished-flute carbide tools, high speed and generous coolant; slightly gummy chips, so use high rake and chip breakers to avoid built-up edge.
Can EN AC-51100 be welded?
Readily TIG/MIG welded with ER5356 (Al-5Mg) filler; clean oxide thoroughly, no post-weld heat treatment needed since the alloy is non-heat-treatable.
Can EN AC-51100 be formed, bent or molded?
Poor fluidity and strong oxide/hot-tear tendency — needs good gating, degassing, flux/cover protection and generous fillets; not suited to thin or intricate sections.
EN AC-51100 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 |
|---|---|---|
| Mgprincipal solid-solution strengthener | 2.5 – 3.5 | 3 |
| Si | ≤ 0.55 | 0.2 |
| Fe | ≤ 0.55 | 0.3 |
| Cukept low for corrosion resistance | ≤ 0.1 | 0.03 |
| Mn | ≤ 0.45 | 0.2 |
| Zn | ≤ 0.1 | |
| Tigrain refiner | ≤ 0.2 | 0.1 |
| Others (each) | ≤ 0.05 | |
| Others (total) | ≤ 0.15 | |
| Al | balance |
What surface finishes work on EN AC-51100?
Excellent bright and hard anodizing due to low silicon; polishes to a high lustre, and accepts chromate-free conversion coatings and paint well.
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-51100 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- AC-51100AlMg3G-AlMg3
How much does EN AC-51100 cost?
EN AC-51100 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-51100 — frequently asked
What is EN AC-51100 used for?
EN AC-51100 is typically used for marine fittings, decorative castings and food equipment. In short: marine-grade cast aluminum; best anodizing of cast alloys; non-heat-treatable, as-cast use.
What is the yield strength of EN AC-51100?
EN AC-51100 has a typical yield strength of 80 MPa (11.6 ksi) and a tensile strength of 150 MPa (21.8 ksi) — weaker than 90% of aluminum grades. Strength varies by condition: see the 3 listed tempers.
Is EN AC-51100 easy to machine?
Yes — machinability is rated very good (70/100, better than 72% of aluminum grades). Machines freely with sharp polished-flute carbide tools, high speed and generous coolant; slightly gummy chips, so use high rake and chip breakers to avoid built-up edge.
Can EN AC-51100 be welded?
Yes — weldability is rated very good (80/100). Readily TIG/MIG welded with ER5356 (Al-5Mg) filler; clean oxide thoroughly, no post-weld heat treatment needed since the alloy is non-heat-treatable.
What surface finishes work on EN AC-51100?
Excellent bright and hard anodizing due to low silicon; polishes to a high lustre, and accepts chromate-free conversion coatings and paint well.
Can EN AC-51100 be formed, bent or molded?
Poor fluidity and strong oxide/hot-tear tendency — needs good gating, degassing, flux/cover protection and generous fillets; not suited to thin or intricate sections.
What is the maximum service temperature of EN AC-51100?
EN AC-51100 is rated for continuous use to about 120°C (248 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between EN AC-51100 S-F and EN AC-51100 S-O?
S-F is the default condition — standard supply condition for marine fittings and housings cast in sand moulds. S-O: use when dimensional stability after machining or maximum stress-corrosion safety is required; slightly lower strength, higher elongation. Yield strength is 80 MPa in S-F versus 70 MPa in S-O.
How much does EN AC-51100 cost?
EN AC-51100 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)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- DIN 1725-2 (withdrawn) — Cast aluminium alloys, G-AlMg3 — DIN (1986)
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.