Aluminum ZL207 T1(J)
Heat-treated state
GB ZL207
Choose for thinner-wall, higher-integrity castings — the faster solidification of the metal mould raises strength above the sand-cast T1 level.
Values for the T1(J) 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 |
T1Default 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(J)This page 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(J)?
ZL207 T1(J) is ZL207 heat treated to T1(J) — choose for thinner-wall, higher-integrity castings — the faster solidification of the metal mould raises strength above the sand-cast T1 level. ZL207 T1(J) has a yield strength of 165 MPa (23.9 ksi) and a tensile strength of 200 MPa (29 ksi) — weaker than 58% of aluminum grades. Elongation at break is 2% and the elastic modulus is 70 GPa (10.2 Msi). ZL207 T1(J) 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). T1 is the default condition FabDigit quotes; T1(J) is available on request or by drawing note.
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
- Needs corrosion protection — 33/100, worse than 91% of aluminum grades
- Hard to polish — 40/100, worse than 91% of aluminum grades
- Limited ductility — 2%, worse than 87% of aluminum grades
- Difficult to weld — 25/100, worse than 76% of aluminum grades
ZL207 T1(J) properties
Typical room-temperature values for ZL207 T1(J); 22 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(J) 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(J) has a yield strength of 165 MPa (23.9 ksi) and a tensile strength of 200 MPa (29 ksi) — weaker than 58% of aluminum grades. Elongation at break is 2% and the elastic modulus is 70 GPa (10.2 Msi).
Thermal6
ZL207 T1(J) 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(J) 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(J) 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(J)'s machinability is good (62/100, better than 55% of aluminum grades); weldability poor (25/100); formability not recommended (5/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ZL207 T1(J)
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(J) — frequently asked
What is ZL207 T1(J) used for?
ZL207 T1(J) 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(J)?
ZL207 T1(J) has a typical yield strength of 165 MPa (23.9 ksi) and a tensile strength of 200 MPa (29 ksi) — weaker than 58% of aluminum grades. Strength varies by condition: see the 3 listed tempers.
Is ZL207 T1(J) 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(J) 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(J)?
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(J) 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(J)?
ZL207 T1(J) 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.