Titanium ZTA15
ZTA15 is a near-alpha titanium casting alloy to GB standards, the cast version of wrought TA15, used where airframe castings need weldability together with elevated-temperature strength.
Reference datasheet — ZTA15 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 HIP+A condition
ZTA15 tempers and conditions
ZTA15 is supplied in 4 conditions, soft to hard. HIP+A is the default FabDigit quotes; the values on this page are for it.
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 | — |
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?
ZTA15 is a near-alpha titanium casting alloy to GB standards, the cast version of wrought TA15, used where airframe castings need weldability together with elevated-temperature strength. It provides 850 MPa yield, 940 MPa tensile, 9 % elongation and 32 HRC with service to about 500 °C — the highest in this cast group — in as-cast, annealed, HIP or HIP + annealed condition, and rates well for welding (score 75). Machinability is low (score 18) and alpha-case removal plus HIP add cost, so cast Ti-6Al-4V (ZTC4) is the alternative when 350 °C service is sufficient. ZTA15 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). ZTA15 has a yield strength of 850 MPa (123 ksi) and a tensile strength of 940 MPa (136 ksi) — stronger than 66% of titanium grades. Elongation at break is 9% and the elastic modulus is 113 GPa (16.4 Msi).
What is ZTA15 used for?
- aircraft structural castings
- engine mounting brackets
- airframe fittings
Advantages
- High service temperature — 500°C (932 °F), better than 94% of titanium grades
Limitations
- Limited ductility — 9%, worse than 97% 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 properties
Typical room-temperature values for ZTA15-HIP+A; bars are the position among titanium grades.
Physical3
ZTA15 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 has a yield strength of 850 MPa (123 ksi) and a tensile strength of 940 MPa (136 ksi) — stronger than 66% of titanium grades. Elongation at break is 9% and the elastic modulus is 113 GPa (16.4 Msi).
Thermal6
ZTA15 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 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 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's machinability is poor (18/100, worse than 83% of titanium grades); weldability very good (75/100); formability poor (15/100).
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 titanium family
Yield strength against density for every titanium grade FabDigit runs. ZTA15 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ZTA15
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.
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 |
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.
Surface treatments FabDigit runs on titanium 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).
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Titanium ZTA15 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Also called
- Ti-6Al-2Zr-1Mo-1V Casting
How much does ZTA15 cost?
ZTA15 is a high-cost titanium ($$$$), pricier than about 78% 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.
ZTA15 — frequently asked
What is ZTA15 used for?
ZTA15 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?
ZTA15 has a typical yield strength of 850 MPa (123 ksi) and a tensile strength of 940 MPa (136 ksi) — stronger than 66% of titanium grades. Strength varies by condition: see the 4 listed tempers.
Is ZTA15 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 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?
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 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?
ZTA15 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.
How much does ZTA15 cost?
ZTA15 is a high-cost titanium ($$$$), pricier than about 78% 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
- 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; 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.