Aluminum EN AC-45300-T7
Temper
EN AC-45300 · ASTM 355.0 · JIS AC4D · GB ZL105
T7 = solution heat treated and overaged (stabilized)
Pick for dimensional stability and best resistance to elevated-temperature softening (e.g. heads, housings running hot).
Values for the T7 condition
Other EN AC-45300 tempers and conditions
EN AC-45300 is listed in 5 conditions; see the grade overview at EN AC-45300.
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 |
T7This page 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-T7?
EN AC-45300-T7 is EN AC-45300 in the T7 temper — pick for dimensional stability and best resistance to elevated-temperature softening (e.g. heads, housings running hot). EN AC-45300-T7 has a yield strength of 165 MPa (23.9 ksi) and a tensile strength of 210 MPa (30.5 ksi) — weaker than 58% of aluminum grades. Elongation at break is 2.5% and the elastic modulus is 71 GPa (10.3 Msi). EN AC-45300-T7 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). T6 is the default condition FabDigit quotes; T7 is available on request or by drawing note.
Advantages
- High service temperature — 175°C (347 °F), better than 83% of aluminum grades
- High electrical conductivity — 42 % IACS, better than 81% of aluminum grades
Limitations
- Limited formability — 8/100, worse than 88% of aluminum grades
- Limited ductility — 2.5%, worse than 83% of aluminum grades
- Hard to polish — 45/100, worse than 76% of aluminum grades
EN AC-45300-T7 properties
Typical room-temperature values for EN AC-45300-T7; 21 are specific to this condition. Other listed values are EN AC-45300 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
EN AC-45300-T7 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-T7 has a yield strength of 165 MPa (23.9 ksi) and a tensile strength of 210 MPa (30.5 ksi) — weaker than 58% of aluminum grades. Elongation at break is 2.5% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
EN AC-45300-T7 is rated for continuous service to 175°C (347 °F). It conducts heat at 158 W/m·K (91.3 BTU/hr·ft·°F), better than 74% of aluminum grades. Thermal expansion is 22 µm/m·K (12.2 µin/in·°F).
Electrical3
EN AC-45300-T7 conducts electricity at 42 % IACS, better than 81% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (50/100), worse than 56% of aluminum grades.
Sustainability4
Producing a kilogram of EN AC-45300-T7 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-T7's machinability is good (68/100, better than 67% of aluminum grades); weldability fair (45/100); formability not recommended (8/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with EN AC-45300-T7
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.
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.
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 | — |
EN AC-45300-T7 — frequently asked
What is EN AC-45300-T7 used for?
EN AC-45300-T7 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-T7?
EN AC-45300-T7 has a typical yield strength of 165 MPa (23.9 ksi) and a tensile strength of 210 MPa (30.5 ksi) — weaker than 58% of aluminum grades. Strength varies by condition: see the 5 listed tempers.
Is EN AC-45300-T7 easy to machine?
Reasonably — machinability is rated good (68/100, better than 67% 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-T7 be welded?
With care — weldability is rated fair (45/100). 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-T7?
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-T7 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-T7?
EN AC-45300-T7 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.