Aluminum EN AC-45300
EN AC-45300 · ASTM 355.0 · JIS AC4D · GB ZL105
EN AC-45300 (AlSi5Cu1Mg, 355.0, AC4D, ZL105) is a heat-treatable Al-Si-Cu-Mg sand and gravity casting alloy available in F, T4, T6, T64 and T7.
Reference datasheet — EN AC-45300 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 T6 condition
EN AC-45300 tempers and conditions
EN AC-45300 is supplied in 5 conditions, soft to hard. T6 is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Cheapest condition for low-stress parts or castings that will be heat treated later. | 90 | 160 | 2 | 60 HB | 42 % IACS |
Solution heat treated and naturally aged | Choose when impact/ductility and shock resistance matter more than yield strength. | 105 | 200 | 4 | 75 HB | 35 % IACS |
Solution heat treated and under-aged | Use when T6 strength is nearly needed but a few percent elongation is required. | 165 | 225 | 3 | 82 HB | 38 % IACS |
Solution heat treated and overaged (stabilized) | Pick for dimensional stability and best resistance to elevated-temperature softening (e.g. heads, housings running hot). | 165 | 210 | 2.5 | 80 HB | 42 % IACS |
T6Default Solution heat treated and artificially aged | Standard high-strength condition for structural and pressure-tight castings; accept low elongation. | 200 | 255 | 1.5 | 95 HB | 39 % IACS |
What is EN AC-45300?
EN AC-45300 (AlSi5Cu1Mg, 355.0, AC4D, ZL105) is a heat-treatable Al-Si-Cu-Mg sand and gravity casting alloy available in F, T4, T6, T64 and T7. It is one of the most widely used structural casting alloys because it combines pressure tightness with a useful strength-to-weight balance: 200 MPa yield, 255 MPa tensile, 95 HB, 71 GPa modulus, 150 W/m·K and 39 % IACS in the default condition. Limits are 1.5 % elongation, service to 175 °C and hot-cracking sensitivity from the 1–1.5 % Cu (weldability score 55); EN AC-45100 offers higher strength and 200 °C service where weldability is not needed. EN AC-45300 has a density of 2.71 g/cm³ (0.0979 lb/in³), heavier than 51% of aluminum grades. It melts at 550°C (1,022 °F). EN AC-45300 has a yield strength of 200 MPa (29 ksi) and a tensile strength of 255 MPa (37 ksi) — stronger than 53% of aluminum grades. Elongation at break is 1.5% and the elastic modulus is 71 GPa (10.3 Msi).
What is EN AC-45300 used for?
- cylinder heads
- pump housings
- aerospace fittings
- structural brackets
Advantages
- High service temperature — 175°C (347 °F), better than 83% of aluminum grades
Limitations
- Limited ductility — 1.5%, worse than 91% of aluminum grades
- Limited formability — 8/100, worse than 88% of aluminum grades
- Hard to polish — 45/100, worse than 76% of aluminum grades
EN AC-45300 properties
Typical room-temperature values for EN AC-45300-T6; bars are the position among aluminum grades.
Physical3
EN AC-45300 has a density of 2.71 g/cm³ (0.0979 lb/in³), heavier than 51% of aluminum grades. It melts at 550°C (1,022 °F).
Mechanical13
EN AC-45300 has a yield strength of 200 MPa (29 ksi) and a tensile strength of 255 MPa (37 ksi) — stronger than 53% of aluminum grades. Elongation at break is 1.5% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
EN AC-45300 is rated for continuous service to 175°C (347 °F). It conducts heat at 150 W/m·K (86.7 BTU/hr·ft·°F), better than 58% of aluminum grades. Thermal expansion is 22 µm/m·K (12.2 µin/in·°F).
Electrical3
EN AC-45300 conducts electricity at 39 % IACS, better than 65% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (52/100), worse than 55% of aluminum grades.
Sustainability4
Producing a kilogram of EN AC-45300 takes about 195 MJ of energy and emits 12 kg of CO₂ — less than 86% of aluminum grades. Typical recycled content is 45%.
Manufacturability8
EN AC-45300's machinability is very good (70/100, better than 72% of aluminum grades); weldability good (55/100); formability not recommended (8/100).
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-45300 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with EN AC-45300
Is EN AC-45300 easy to machine?
Machines freely with sharp PCD or polished carbide tooling and high speeds; eutectic Si is abrasive, so expect faster edge wear than 6061 and use flood coolant to avoid built-up edge.
Can EN AC-45300 be welded?
TIG/MIG repair welding is possible with 4043 or 4145 filler, but the 1–1.5 % Cu gives hot-cracking sensitivity and post-weld solution + age is needed to restore T6 properties.
Can EN AC-45300 be formed, bent or molded?
Sand and gravity (permanent-mould) casting alloy with good fluidity and pressure tightness; feed well and control Fe to keep ductility — it is not a cold-formable alloy.
EN AC-45300 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 | 4.5 – 5.5 | 5 |
| Cu | 1 – 1.5 | 1.25 |
| Mg | 0.35 – 0.65 | 0.5 |
| Fe≤0.35 for sand/gravity castings of high quality; higher limit for die/secondary metal | ≤ 0.55 | |
| Mn | ≤ 0.55 | |
| Zn | ≤ 0.15 | |
| Tigrain refiner | ≤ 0.25 | 0.12 |
| Ni | ≤ 0.1 | |
| Pb | ≤ 0.05 | |
| Sn | ≤ 0.05 | |
| others (each / total)each ≤0.05, total ≤0.15 | ≤ 0.15 | |
| Al | balance |
What surface finishes work on EN AC-45300?
Takes chemical conversion coating, primer/paint and hard anodize well; decorative anodizing is mottled dark grey, and impregnation is sometimes used for pressure-tight parts.
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-45300 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
How much does EN AC-45300 cost?
EN AC-45300 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-45300 — frequently asked
What is EN AC-45300 used for?
EN AC-45300 is typically used for cylinder heads, pump housings, aerospace fittings and structural brackets. In short: pressure-tight structural casting; best weldability of Cu-bearing Al-Si; heat-treatable to T6/T7.
What is the yield strength of EN AC-45300?
EN AC-45300 has a typical yield strength of 200 MPa (29 ksi) and a tensile strength of 255 MPa (37 ksi) — stronger than 53% of aluminum grades. Strength varies by condition: see the 5 listed tempers.
Is EN AC-45300 easy to machine?
Yes — machinability is rated very good (70/100, better than 72% of aluminum grades). Machines freely with sharp PCD or polished carbide tooling and high speeds; eutectic Si is abrasive, so expect faster edge wear than 6061 and use flood coolant to avoid built-up edge.
Can EN AC-45300 be welded?
Yes — weldability is rated good (55/100). TIG/MIG repair welding is possible with 4043 or 4145 filler, but the 1–1.5 % Cu gives hot-cracking sensitivity and post-weld solution + age is needed to restore T6 properties.
What surface finishes work on EN AC-45300?
Takes chemical conversion coating, primer/paint and hard anodize well; decorative anodizing is mottled dark grey, and impregnation is sometimes used for pressure-tight parts.
Can EN AC-45300 be formed, bent or molded?
Sand and gravity (permanent-mould) casting alloy with good fluidity and pressure tightness; feed well and control Fe to keep ductility — it is not a cold-formable alloy.
What is the maximum service temperature of EN AC-45300?
EN AC-45300 is rated for continuous use to about 175°C (347 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between EN AC-45300-T6 and EN AC-45300-F?
T6 is the default condition — standard high-strength condition for structural and pressure-tight castings; accept low elongation. F: cheapest condition for low-stress parts or castings that will be heat treated later. Yield strength is 200 MPa in T6 versus 90 MPa in F.
How much does EN AC-45300 cost?
EN AC-45300 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 — (ZL105) — SAC (2013)
- ASM Handbook Vol. 2 — Properties of Aluminum Alloys (355.0) — ASM International (1990)
- Aluminum Association Designations and Chemical Composition Limits for Aluminum Alloys in the Form of Castings and Ingot — The Aluminum Association (2019)
- ASM Handbook Vol. 15 — Casting — ASM International (2008)
- / SMM price quotations (2025)
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.