Aluminum ZL105-T7
Temper
GB ZL105 · ASTM A355.0 · EN AC-45300 · JIS AC4D
T7 = solution heat treated and overaged (stabilized)
Pick for parts running hot (cylinder heads, manifolds) where dimensional stability beats peak strength.
Values for the T7 condition
Other ZL105 tempers and conditions
ZL105 is listed in 9 conditions; see the grade overview at ZL105.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Lowest cost condition for lightly loaded, dimensionally sensitive parts where no heat-treat distortion is acceptable. | 90 | 160 | 2.5 | 55 HB | 33 % IACS |
Cooled from hot working and naturally aged | Cheap strength/stability boost for permanent-mould parts where full solution treatment would distort thin sections. | 145 | 205 | 1.5 | 65 HB | 37 % IACS |
T5, stress relieved by stretching | Chosen when dimensional stability and high thermal conductivity matter more than strength. | 160 | 195 | 1.5 | 65 HB | 39 % IACS |
Cooled from hot working and artificially aged | Good compromise of strength and ductility for general engine and pump castings per GB/T 1173. | 180 | 250 | 1.5 | 75 HB | 37 % IACS |
T6Default Solution heat treated and artificially aged | Default stocked condition — maximum practical strength and hardness for machined structural castings. | 200 | 265 | 2 | 85 HB | 36 % IACS |
Solution treated and fully over-aged for maximum stability | Most stable, most ductile heat-treated condition for long-life hot-running castings. | 200 | 250 | 3 | 75 HB | 39 % IACS |
T7This page Solution heat treated and overaged (stabilized) | Pick for parts running hot (cylinder heads, manifolds) where dimensional stability beats peak strength. | 205 | 240 | 1.5 | 75 HB | 38 % IACS |
T6 variant, underaged | Highest strength sand-cast condition when ductility can be sacrificed. | 240 | 270 | 1 | 90 HB | 36 % IACS |
T6, heat treated by the user | Permanent-mould condition for the hardest, most wear-resistant machined surfaces. | 275 | 310 | 1 | 105 HB | 36 % IACS |
What is ZL105-T7?
ZL105-T7 is ZL105 in the T7 temper — pick for parts running hot (cylinder heads, manifolds) where dimensional stability beats peak strength. ZL105-T7 has a yield strength of 205 MPa (29.7 ksi) and a tensile strength of 240 MPa (34.8 ksi) — stronger than 54% of aluminum grades. Elongation at break is 1.5% and the elastic modulus is 71 GPa (10.3 Msi). ZL105-T7 has a density of 2.71 g/cm³ (0.0979 lb/in³), heavier than 51% of aluminum grades. It melts at 546°C (1,015 °F). T6 is the default condition FabDigit quotes; T7 is available on request or by drawing note.
Advantages
- High service temperature — 200°C (392 °F), better than 90% of aluminum grades
- Conducts heat well — 160 W/m·K (92.4 BTU/hr·ft·°F), better than 76% of aluminum grades
Limitations
- Limited formability — 5/100, worse than 94% of aluminum grades
- Limited ductility — 1.5%, worse than 91% of aluminum grades
- Hard to polish — 45/100, worse than 76% of aluminum grades
ZL105-T7 properties
Typical room-temperature values for ZL105-T7; 10 are specific to this condition. Other listed values are ZL105 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
ZL105-T7 has a density of 2.71 g/cm³ (0.0979 lb/in³), heavier than 51% of aluminum grades. It melts at 546°C (1,015 °F).
Mechanical12
ZL105-T7 has a yield strength of 205 MPa (29.7 ksi) and a tensile strength of 240 MPa (34.8 ksi) — stronger than 54% of aluminum grades. Elongation at break is 1.5% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
ZL105-T7 is rated for continuous service to 200°C (392 °F). It conducts heat at 160 W/m·K (92.4 BTU/hr·ft·°F), better than 76% of aluminum grades. Thermal expansion is 22.4 µm/m·K (12.4 µin/in·°F).
Electrical3
ZL105-T7 conducts electricity at 38 % IACS, better than 61% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 62% of aluminum grades.
Sustainability4
Producing a kilogram of ZL105-T7 takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 70%.
Manufacturability8
ZL105-T7's machinability is good (58/100, worse than 54% of aluminum grades); weldability good (55/100); formability not recommended (5/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ZL105-T7
Is ZL105 easy to machine?
Machines well in T5/T6 with carbide or PCD tooling — high speed, moderate feed, flood coolant; eutectic Si is abrasive, so PCD pays off in volume production.
Can ZL105 be welded?
TIG/MIG repair welding with ER4043 or ER4145 filler is possible but the Cu content raises hot-crack risk; preheat 150–200 °C and re-solution/re-age critical parts after welding.
Can ZL105 be formed, bent or molded?
Sand, permanent-mould and low-pressure casting alloy with good fluidity and pressure tightness; feed heavy sections well and grain-refine/modify (Ti-B, Sr/Na) to hit T6 elongation.
What surface finishes work on ZL105?
Takes chromate conversion coating, primer and paint well; sulfuric anodize gives a grey, uneven film — use hard-coat only for wear, and impregnate porous castings before plating.
ZL105 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 | 1.2 |
| Mg | 0.4 – 0.6 | 0.5 |
| Feimpurity; ≤0.5 % for permanent-mould/pressure-tight castings | ≤ 0.6 | — |
| Mnimpurity | ≤ 0.5 | — |
| Znimpurity | ≤ 0.3 | — |
| Tigrain refiner / impurity | ≤ 0.25 | — |
| Crimpurity (AA 355.0 limit) | ≤ 0.25 | — |
| Others (each/total)total impurities per GB/T 1173 | ≤ 1.1 | — |
| Al | balance | — |
ZL105-T7 — frequently asked
What is ZL105-T7 used for?
ZL105-T7 is typically used for pump bodies, cylinder heads and gearbox housings. In short: pressure-tight Cu-bearing casting; good as-cast machinability; higher hot-crack risk.
What is the yield strength of ZL105-T7?
ZL105-T7 has a typical yield strength of 205 MPa (29.7 ksi) and a tensile strength of 240 MPa (34.8 ksi) — stronger than 54% of aluminum grades. Strength varies by condition: see the 9 listed tempers.
Is ZL105-T7 easy to machine?
Reasonably — machinability is rated good (58/100, worse than 54% of aluminum grades). Machines well in T5/T6 with carbide or PCD tooling — high speed, moderate feed, flood coolant; eutectic Si is abrasive, so PCD pays off in volume production.
Can ZL105-T7 be welded?
Yes — weldability is rated good (55/100). TIG/MIG repair welding with ER4043 or ER4145 filler is possible but the Cu content raises hot-crack risk; preheat 150–200 °C and re-solution/re-age critical parts after welding.
What surface finishes work on ZL105-T7?
Takes chromate conversion coating, primer and paint well; sulfuric anodize gives a grey, uneven film — use hard-coat only for wear, and impregnate porous castings before plating.
Can ZL105-T7 be formed, bent or molded?
Sand, permanent-mould and low-pressure casting alloy with good fluidity and pressure tightness; feed heavy sections well and grain-refine/modify (Ti-B, Sr/Na) to hit T6 elongation.
What is the maximum service temperature of ZL105-T7?
ZL105-T7 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ZL105-T6 and ZL105-F?
T6 is the default condition — default stocked condition — maximum practical strength and hardness for machined structural castings. F: lowest cost condition for lightly loaded, dimensionally sensitive parts where no heat-treat distortion is acceptable. Yield strength is 200 MPa in T6 versus 90 MPa in F.
Sources
- ASTM B26/B26M Aluminum-Alloy Sand Castings (355.0) — ASTM (2018)
- ASM Specialty Handbook: Aluminum and Aluminum Alloys — ASM International (1993)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.15 — Casting — ASM International (2008)
- Aluminum Association Designations and Chemical Composition Limits for Aluminum Alloys in the Form of Castings and Ingot — The Aluminum Association (2019)
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.