Aluminum ZL105A
ASTM A355.0
ZL105A (A355.0) is a high-purity version of ZL105 — the same AlSi5Cu1Mg system with tighter impurity limits — roughly comparable to C355.0 and supplied in F, T1, T5, T6, T61, T62 and T7.
Reference datasheet — ZL105A 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
ZL105A tempers and conditions
ZL105A is supplied in 7 conditions, soft to hard. T6 is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Lowest cost condition for lightly loaded or dimensionally sensitive parts where no heat-treat distortion is acceptable. | 90 | 165 | 2 | 65 HB | 42 % IACS |
Cooled from hot working and naturally aged | Simple aging of the as-cast part for a modest strength gain without solution treatment or quench distortion. | 135 | 205 | 1.5 | 72 HB | 41 % IACS |
Solution heat treated and overaged (stabilized) | Choose for dimensional stability and reduced residual stress at elevated service temperature, accepting lower strength. | 200 | 250 | 4 | 78 HB | 42 % IACS |
T6Default Solution heat treated and artificially aged | The default general-purpose condition — best balance of strength, hardness and ductility for structural castings (equivalent to C355.0-T6). | 225 | 290 | 3 | 88 HB | 39 % IACS |
Cooled from hot working and artificially aged | The condition specified in GB/T 1173 for ZL105A — highest guaranteed strength for Chinese-standard castings. | 225 | 290 | 2 | 85 HB | 40 % IACS |
T6 variant, underaged | Pick when peak strength is needed from chill-cast or premium-quality castings and some ductility can be traded away. | 250 | 310 | 3 | 95 HB | 39 % IACS |
T6, heat treated by the user | Aerospace premium-quality practice giving the highest guaranteed properties from well-fed, low-porosity castings. | 270 | 315 | 2.5 | 100 HB | 38 % IACS |
What is ZL105A?
ZL105A (A355.0) is a high-purity version of ZL105 — the same AlSi5Cu1Mg system with tighter impurity limits — roughly comparable to C355.0 and supplied in F, T1, T5, T6, T61, T62 and T7. The cleaner chemistry lifts properties to 225 MPa yield, 290 MPa tensile, 3% elongation, HB 88 and machinability 70, which suits aerospace fittings and high-strength pump and gearbox castings. Limits are the copper-related hot-cracking risk in welding, a 150 °C service ceiling and higher melt cost than ZL105. ZL101A is the alternative when corrosion resistance outweighs strength. ZL105A 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). ZL105A has a yield strength of 225 MPa (32.6 ksi) and a tensile strength of 290 MPa (42.1 ksi) — stronger than 59% of aluminum grades. Elongation at break is 3% and the elastic modulus is 71 GPa (10.3 Msi).
What is ZL105A used for?
- Aerospace fittings
- High-strength pump castings
- Gearbox and transmission housings
- Hydraulic valve bodies
- Airframe brackets
- Compressor housings
- Pressure-tight hydraulic housings
Limitations
- Limited ductility — 3%, worse than 79% of aluminum grades
ZL105A properties
Typical room-temperature values for ZL105A-T6; bars are the position among aluminum grades.
Physical3
ZL105A 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
ZL105A has a yield strength of 225 MPa (32.6 ksi) and a tensile strength of 290 MPa (42.1 ksi) — stronger than 59% of aluminum grades. Elongation at break is 3% and the elastic modulus is 71 GPa (10.3 Msi).
Thermal6
ZL105A is rated for continuous service to 150°C (302 °F). It conducts heat at 151 W/m·K (87.2 BTU/hr·ft·°F), better than 63% of aluminum grades. Thermal expansion is 22.3 µm/m·K (12.4 µin/in·°F).
Electrical3
ZL105A conducts electricity at 39 % IACS, better than 65% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 62% of aluminum grades.
Sustainability4
Producing a kilogram of ZL105A takes about 200 MJ of energy and emits 12.5 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 35%.
Manufacturability7
ZL105A's machinability is very good (70/100, better than 72% of aluminum grades); weldability good (55/100).
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. ZL105A is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ZL105A
Is ZL105A easy to machine?
Machines well with PCD or polished carbide, high speed and low feed; eutectic silicon is abrasive, so use flood coolant and expect tool wear higher than 6061.
Can ZL105A be welded?
TIG/MIG repairable with ER4043 or ER4145 filler; the Cu content raises hot-cracking risk and welded areas should be re-solution treated and aged to restore T6 properties.
Can ZL105A be formed, bent or molded?
Excellent fluidity and pressure tightness in sand, permanent-mold and low-pressure casting; use chills and good risering, Sr/Na modification and Ti-B grain refinement, and control hydrogen to avoid porosity.
ZL105A 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 |
|---|---|---|
| SiGB/T 1173 ZAlSi5Cu1MgA | 4.5 – 5.5 | 5 |
| Cu | 1 – 1.5 | 1.25 |
| Mgnarrower than ZL105 (0.4–0.6) | 0.4 – 0.55 | 0.48 |
| Feimpurity limit, high-purity grade | ≤ 0.2 | |
| Mnimpurity | ≤ 0.1 | |
| Tiimpurity / grain refiner residue | ≤ 0.15 | |
| Znimpurity | ≤ 0.1 | |
| others eachimpurity | ≤ 0.05 | |
| others totalimpurity total | ≤ 0.5 | |
| Al | balance |
What surface finishes work on ZL105A?
Takes protective sulphuric or hard anodize (dark grey, non-decorative), chromate/trivalent conversion coating, and powder or wet paint; shot-peening improves fatigue on machined surfaces.
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 ZL105A in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- A355.0
- Also called
- ZAlSi5Cu1MgA
- Other
- C355.0
How much does ZL105A cost?
ZL105A 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.
ZL105A — frequently asked
What is ZL105A used for?
ZL105A is typically used for aerospace fittings, high-strength pump castings, gearbox and transmission housings, hydraulic valve bodies, airframe brackets and compressor housings. In short: high-purity ZL105 upgrade; best machinability in the family; aerospace-grade cleanliness.
What is the yield strength of ZL105A?
ZL105A has a typical yield strength of 225 MPa (32.6 ksi) and a tensile strength of 290 MPa (42.1 ksi) — stronger than 59% of aluminum grades. Strength varies by condition: see the 7 listed tempers.
Is ZL105A easy to machine?
Yes — machinability is rated very good (70/100, better than 72% of aluminum grades). Machines well with PCD or polished carbide, high speed and low feed; eutectic silicon is abrasive, so use flood coolant and expect tool wear higher than 6061.
Can ZL105A be welded?
Yes — weldability is rated good (55/100). TIG/MIG repairable with ER4043 or ER4145 filler; the Cu content raises hot-cracking risk and welded areas should be re-solution treated and aged to restore T6 properties.
What surface finishes work on ZL105A?
Takes protective sulphuric or hard anodize (dark grey, non-decorative), chromate/trivalent conversion coating, and powder or wet paint; shot-peening improves fatigue on machined surfaces.
Can ZL105A be formed, bent or molded?
Excellent fluidity and pressure tightness in sand, permanent-mold and low-pressure casting; use chills and good risering, Sr/Na modification and Ti-B grain refinement, and control hydrogen to avoid porosity.
What is the maximum service temperature of ZL105A?
ZL105A is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ZL105A-T6 and ZL105A-F?
T6 is the default condition — the default general-purpose condition — best balance of strength, hardness and ductility for structural castings (equivalent to C355.0-T6). F: lowest cost condition for lightly loaded or dimensionally sensitive parts where no heat-treat distortion is acceptable. Yield strength is 225 MPa in T6 versus 90 MPa in F.
How much does ZL105A cost?
ZL105A 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
- ASTM B26/B26M and B108/B108M (355.0, C355.0 castings) — ASTM International (2022)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.15 — Casting — ASM International (2008)
- Aluminum Association Registration Record (Pink Sheets) — cast alloy limits — The Aluminum Association (2018)
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.