Titanium ZTA15-A (Solution annealed)
Temper
Choose when residual stresses from casting and weld repair must be removed but HIP is not specified.
Values for the A condition
Other ZTA15 tempers and conditions
ZTA15 is listed in 4 conditions; see the grade overview at ZTA15.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Lowest-cost condition for non-critical or lightly loaded castings where internal microporosity is acceptable. | 815 | 905 | 6 | 33 HRC | — |
AThis page Solution annealed | Choose when residual stresses from casting and weld repair must be removed but HIP is not specified. | 825 | 920 | 7 | 32 HRC | — |
Hot isostatic pressed | Use where internal shrinkage porosity must be closed to raise ductility and fatigue life of load-bearing castings. | 845 | 935 | 9 | 33 HRC | — |
HIP+ADefault Hot isostatically pressed then annealed | Standard delivery condition for aerospace ZTA15 castings: pores closed and HIP-induced stresses relieved, best ductility/fatigue balance. | 850 | 940 | 9 | 32 HRC | — |
What is ZTA15-A?
ZTA15-A is ZTA15 in the A temper — choose when residual stresses from casting and weld repair must be removed but HIP is not specified. ZTA15-A has a yield strength of 825 MPa (120 ksi) and a tensile strength of 920 MPa (133 ksi) — stronger than 62% of titanium grades. Elongation at break is 7% and the elastic modulus is 113 GPa (16.4 Msi). ZTA15-A has a density of 4.46 g/cm³ (0.161 lb/in³), lighter than 78% of titanium grades. It melts at 1,630°C (2,966 °F). HIP+A is the default condition FabDigit quotes; A is available on request or by drawing note.
Advantages
- High service temperature — 500°C (932 °F), better than 94% of titanium grades
Limitations
- Limited ductility — 7%, worse than 100% of titanium grades
- Hard to polish — 60/100, worse than 97% of titanium grades
- Limited formability — 15/100, worse than 93% of titanium grades
ZTA15-A properties
Typical room-temperature values for ZTA15-A; 11 are specific to this condition. Other listed values are ZTA15 reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
ZTA15-A has a density of 4.46 g/cm³ (0.161 lb/in³), lighter than 78% of titanium grades. It melts at 1,630°C (2,966 °F).
Mechanical16
ZTA15-A has a yield strength of 825 MPa (120 ksi) and a tensile strength of 920 MPa (133 ksi) — stronger than 62% of titanium grades. Elongation at break is 7% and the elastic modulus is 113 GPa (16.4 Msi).
Thermal6
ZTA15-A is rated for continuous service to 500°C (932 °F). It conducts heat at 7.5 W/m·K (4.33 BTU/hr·ft·°F), worse than 65% of titanium grades. Thermal expansion is 8.8 µm/m·K (4.89 µin/in·°F).
Electrical3
ZTA15-A conducts electricity at 1.1 % IACS, worse than 67% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (90/100), worse than 63% of titanium grades.
Sustainability4
Producing a kilogram of ZTA15-A takes about 700 MJ of energy and emits 42 kg of CO₂ — more than 74% of titanium grades. Typical recycled content is 25%.
Manufacturability8
ZTA15-A's machinability is poor (18/100, worse than 83% of titanium grades); weldability very good (75/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ZTA15-A
Is ZTA15 easy to machine?
Machine with rigid setups, sharp uncoated-carbide or PVD-coated tools, low surface speed (25–45 m/min) and heavy flood coolant; avoid dwelling to prevent work hardening and fire risk from fine chips.
Can ZTA15 be welded?
Very good GTAW/EBW weldability as a near-alpha alloy — weld in vacuum or fully argon-shielded chamber with matching ZTA15/TA15 filler, keep O/H pickup low, then stress-relieve at 600–650 °C.
Can ZTA15 be formed, bent or molded?
Poured by VAR/ISM into rammed-graphite or ceramic-shell moulds under vacuum; allow generous machining stock, expect alpha-case removal by chemical milling and specify HIP for structural parts.
What surface finishes work on ZTA15?
Grit-blast plus chemical milling to strip alpha case, then passivate; colour anodising, ion nitriding or dry-film lube for fretting/galling areas — never plate directly without a proper Ti activation cycle.
ZTA15 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 |
|---|---|---|
| Alprimary alpha strengthener | 5.5 – 7.1 | 6.3 |
| Zr | 1.5 – 2.5 | 2 |
| Mobeta stabiliser | 0.5 – 2 | 1.2 |
| Vbeta stabiliser | 0.8 – 2.5 | 1.5 |
| Feimpurity | ≤ 0.25 | — |
| Siimpurity | ≤ 0.15 | — |
| Cimpurity | ≤ 0.1 | — |
| Ointerstitial, controls ductility | ≤ 0.15 | — |
| Nimpurity | ≤ 0.05 | — |
| Himpurity | ≤ 0.02 | — |
| Other, eachtotal ≤0.40 | ≤ 0.1 | — |
| Ti | balance | — |
ZTA15-A — frequently asked
What is ZTA15-A used for?
ZTA15-A is typically used for aircraft structural castings, engine mounting brackets and airframe fittings. In short: near-alpha cast titanium; 500 °C service capability; best weldability at high strength.
What is the yield strength of ZTA15-A?
ZTA15-A has a typical yield strength of 825 MPa (120 ksi) and a tensile strength of 920 MPa (133 ksi) — stronger than 62% of titanium grades. Strength varies by condition: see the 4 listed tempers.
Is ZTA15-A easy to machine?
Not especially — machinability is rated poor (18/100, worse than 83% of titanium grades). Machine with rigid setups, sharp uncoated-carbide or PVD-coated tools, low surface speed (25–45 m/min) and heavy flood coolant; avoid dwelling to prevent work hardening and fire risk from fine chips.
Can ZTA15-A be welded?
Yes — weldability is rated very good (75/100). Very good GTAW/EBW weldability as a near-alpha alloy — weld in vacuum or fully argon-shielded chamber with matching ZTA15/TA15 filler, keep O/H pickup low, then stress-relieve at 600–650 °C.
What surface finishes work on ZTA15-A?
Grit-blast plus chemical milling to strip alpha case, then passivate; colour anodising, ion nitriding or dry-film lube for fretting/galling areas — never plate directly without a proper Ti activation cycle.
Can ZTA15-A be formed, bent or molded?
Poured by VAR/ISM into rammed-graphite or ceramic-shell moulds under vacuum; allow generous machining stock, expect alpha-case removal by chemical milling and specify HIP for structural parts.
What is the maximum service temperature of ZTA15-A?
ZTA15-A is rated for continuous use to about 500°C (932 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ZTA15 HIP+A and ZTA15-F?
HIP+A is the default condition — standard delivery condition for aerospace ZTA15 castings: pores closed and HIP-induced stresses relieved, best ductility/fatigue balance. F: lowest-cost condition for non-critical or lightly loaded castings where internal microporosity is acceptable. Yield strength is 850 MPa in HIP+A versus 815 MPa in F.
Sources
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.15 — Casting (Titanium castings, HIP) — ASM International (2008)
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.