Aluminum ZL207-T1
Temper · default condition
GB ZL207
T1 = cooled from hot working and naturally aged
Standard supply condition for ZL207 sand castings — direct artificial aging develops the RE/Cu dispersoid strengthening for 300–350 °C service.
Values for the T1 condition
Other ZL207 tempers and conditions
ZL207 is listed in 3 conditions; see the grade overview at ZL207.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Use only for non-critical or dimensionally sensitive parts; strength and heat stability are below the aged condition. | 120 | 155 | 2 | 70 HB | 30 % IACS |
T1DefaultThis page Cooled from hot working and naturally aged | Standard supply condition for ZL207 sand castings — direct artificial aging develops the RE/Cu dispersoid strengthening for 300–350 °C service. | 150 | 185 | 1.5 | 80 HB | 32 % IACS |
T1 | Choose for thinner-wall, higher-integrity castings — the faster solidification of the metal mould raises strength above the sand-cast T1 level. | 165 | 200 | 2 | 85 HB | 32 % IACS |
What is ZL207-T1?
ZL207-T1 is ZL207 in the T1 temper — standard supply condition for ZL207 sand castings — direct artificial aging develops the RE/Cu dispersoid strengthening for 300–350 °C service. ZL207-T1 has a yield strength of 150 MPa (21.8 ksi) and a tensile strength of 185 MPa (26.8 ksi) — weaker than 65% of aluminum grades. Elongation at break is 1.5% and the elastic modulus is 70 GPa (10.2 Msi). ZL207-T1 has a density of 2.85 g/cm³ (0.103 lb/in³), heavier than 96% of aluminum grades. It melts at 545°C (1,013 °F).
Advantages
- High service temperature — 350°C (662 °F), better than 100% of aluminum grades
Limitations
- Limited formability — 5/100, worse than 94% of aluminum grades
- Limited ductility — 1.5%, worse than 91% of aluminum grades
- Needs corrosion protection — 33/100, worse than 91% of aluminum grades
- Hard to polish — 40/100, worse than 91% of aluminum grades
- Difficult to weld — 25/100, worse than 76% of aluminum grades
ZL207-T1 properties
Typical room-temperature values for ZL207-T1; 11 are specific to this condition. Other listed values are ZL207 reference data and may not represent this condition. Bars are the position among aluminum grades.
Physical3
ZL207-T1 has a density of 2.85 g/cm³ (0.103 lb/in³), heavier than 96% of aluminum grades. It melts at 545°C (1,013 °F).
Mechanical10
ZL207-T1 has a yield strength of 150 MPa (21.8 ksi) and a tensile strength of 185 MPa (26.8 ksi) — weaker than 65% of aluminum grades. Elongation at break is 1.5% and the elastic modulus is 70 GPa (10.2 Msi).
Thermal6
ZL207-T1 is rated for continuous service to 350°C (662 °F). It conducts heat at 130 W/m·K (75.1 BTU/hr·ft·°F), worse than 65% of aluminum grades. Thermal expansion is 21 µm/m·K (11.7 µin/in·°F).
Electrical3
ZL207-T1 conducts electricity at 32 % IACS, worse than 63% of aluminum grades.
Chemical & Environmental3
Corrosion resistance is poor (33/100), worse than 91% of aluminum grades.
Sustainability4
Producing a kilogram of ZL207-T1 takes about 200 MJ of energy and emits 13 kg of CO₂ — less than 60% of aluminum grades. Typical recycled content is 15%.
Manufacturability8
ZL207-T1's machinability is good (62/100, better than 55% of aluminum grades); weldability poor (25/100); formability not recommended (5/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ZL207-T1
Is ZL207 easy to machine?
Machines easily with sharp carbide tooling and high speeds, but hard RE/Cu intermetallics accelerate edge wear and porosity can be exposed on finish cuts.
Can ZL207 be welded?
Poor fusion weldability — Cu-rich, wide-freezing-range alloy is highly hot-crack sensitive; repair only by TIG with Al-Cu filler and immediate re-aging, otherwise use mechanical joints.
Can ZL207 be formed, bent or molded?
Casting alloy only: use generous fillets, directional solidification and chills to counter hot tearing; pour ~700–730 °C with degassing and RE-safe fluxing, no cold forming.
What surface finishes work on ZL207?
Best protected by hard anodizing, chromate-free conversion coating or heat-resistant paint; decorative anodizing gives dark, blotchy films because of Cu and RE phases.
ZL207 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 |
|---|---|---|
| mischmetal, mainly Ce-rich | 4.4 – 5 | 4.7 |
| Cu | 3 – 3.4 | 3.2 |
| Si | 1.6 – 2 | 1.8 |
| Mn | 0.9 – 1.2 | 1.05 |
| Ni | 0.2 – 0.3 | 0.25 |
| Zr | 0.15 – 0.25 | 0.2 |
| Mg | 0.15 – 0.25 | 0.2 |
| Tigrain refiner | 0.05 – 0.2 | 0.12 |
| Feimpurity limit, sand cast | ≤ 0.6 | — |
| Al | balance | — |
ZL207-T1 — frequently asked
What is ZL207-T1 used for?
ZL207-T1 is typically used for high-temperature engine castings, turbine housings, air-cooled cylinder heads, pistons and piston crowns, exhaust-side brackets and adapters and hot-running pump housings. In short: highest-temperature ZL alloy; 350 °C service capability; not practically weldable.
What is the yield strength of ZL207-T1?
ZL207-T1 has a typical yield strength of 150 MPa (21.8 ksi) and a tensile strength of 185 MPa (26.8 ksi) — weaker than 65% of aluminum grades. Strength varies by condition: see the 3 listed tempers.
Is ZL207-T1 easy to machine?
Reasonably — machinability is rated good (62/100, better than 55% of aluminum grades). Machines easily with sharp carbide tooling and high speeds, but hard RE/Cu intermetallics accelerate edge wear and porosity can be exposed on finish cuts.
Can ZL207-T1 be welded?
Not readily — weldability is rated poor (25/100). Poor fusion weldability — Cu-rich, wide-freezing-range alloy is highly hot-crack sensitive; repair only by TIG with Al-Cu filler and immediate re-aging, otherwise use mechanical joints.
What surface finishes work on ZL207-T1?
Best protected by hard anodizing, chromate-free conversion coating or heat-resistant paint; decorative anodizing gives dark, blotchy films because of Cu and RE phases.
Can ZL207-T1 be formed, bent or molded?
Casting alloy only: use generous fillets, directional solidification and chills to counter hot tearing; pour ~700–730 °C with degassing and RE-safe fluxing, no cold forming.
What is the maximum service temperature of ZL207-T1?
ZL207-T1 is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ZL207-T1 and ZL207-F?
T1 is the default condition — standard supply condition for ZL207 sand castings — direct artificial aging develops the RE/Cu dispersoid strengthening for 300–350 °C service. F: use only for non-critical or dimensionally sensitive parts; strength and heat stability are below the aged condition. Yield strength is 150 MPa in T1 versus 120 MPa in F.
Sources
- ASM Handbook Vol. 2: Properties and Selection — Nonferrous Alloys — ASM International (1990)
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.