Titanium Grade Ti-Pd18-A (Solution annealed)
Temper · default condition
ASTM B367 Grade Ti-Pd18
Standard supply condition: residual casting stresses removed, stable dimensions and best all-round corrosion/ductility balance.
Values for the A condition
Other Grade Ti-Pd18 tempers and conditions
Grade Ti-Pd18 is listed in 5 conditions; see the grade overview at Grade Ti-Pd18.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Lowest-cost condition for thick, lightly loaded corrosion hardware where internal porosity is acceptable. | 525 | 650 | 10 | 26 HRC | — |
Stress relieved | Used after weld repair or heavy machining when full annealing would risk distortion or oxide scaling. | 530 | 655 | 11 | 26 HRC | 1.4 % IACS |
ADefaultThis page Solution annealed | Standard supply condition: residual casting stresses removed, stable dimensions and best all-round corrosion/ductility balance. | 540 | 660 | 12 | 26 HRC | — |
Hot isostatically pressed then annealed | Highest-integrity condition for critical chemical-plant and subsea castings needing both densification and stress-free stability. | 545 | 670 | 15 | 26 HRC | 1.4 % IACS |
Hot isostatic pressed | Choose for pressure-containing or fatigue-loaded castings; closes shrinkage porosity and lifts ductility and fatigue life. | 550 | 680 | 14 | 27 HRC | 1.4 % IACS |
What is Grade Ti-Pd18-A?
Grade Ti-Pd18-A is Grade Ti-Pd18 in the A temper — standard supply condition: residual casting stresses removed, stable dimensions and best all-round corrosion/ductility balance. Grade Ti-Pd18-A has a yield strength of 540 MPa (78.3 ksi) and a tensile strength of 660 MPa (95.7 ksi) — weaker than 58% of titanium grades. Elongation at break is 12% and the elastic modulus is 103 GPa (14.9 Msi). Grade Ti-Pd18-A has a density of 4.48 g/cm³ (0.162 lb/in³), lighter than 71% of titanium grades. It melts at 1,650°C (3,002 °F).
Limitations
- Limited formability — 20/100, worse than 83% of titanium grades
- Limited ductility — 12%, worse than 78% of titanium grades
Grade Ti-Pd18-A properties
Typical room-temperature values for Grade Ti-Pd18-A; 13 are specific to this condition. Other listed values are Grade Ti-Pd18 reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
Grade Ti-Pd18-A has a density of 4.48 g/cm³ (0.162 lb/in³), lighter than 71% of titanium grades. It melts at 1,650°C (3,002 °F).
Mechanical16
Grade Ti-Pd18-A has a yield strength of 540 MPa (78.3 ksi) and a tensile strength of 660 MPa (95.7 ksi) — weaker than 58% of titanium grades. Elongation at break is 12% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
Grade Ti-Pd18-A is rated for continuous service to 315°C (599 °F). It conducts heat at 7.6 W/m·K (4.39 BTU/hr·ft·°F), worse than 59% of titanium grades. Thermal expansion is 9.4 µm/m·K (5.22 µin/in·°F).
Electrical3
Grade Ti-Pd18-A conducts electricity at 1.4 % IACS, better than 53% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (95/100), better than 83% of titanium grades.
Sustainability4
Producing a kilogram of Grade Ti-Pd18-A takes about 680 MJ of energy and emits 42 kg of CO₂ — more than 51% of titanium grades. Typical recycled content is 30%.
Manufacturability8
Grade Ti-Pd18-A's machinability is poor (22/100, worse than 55% of titanium grades); weldability very good (80/100); formability poor (20/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Grade Ti-Pd18-A
Is Grade Ti-Pd18 easy to machine?
Machine like Ti-6Al-4V but slightly easier: rigid setups, sharp uncoated-carbide or PVD-coated tools, 25–45 m/min, heavy flood coolant, never dwell — and remove the cast alpha case by chem-milling before finish cuts.
Can Grade Ti-Pd18 be welded?
Excellent GTAW/EBW/plasma weldability with matching Grade 18 filler under full argon trailing/back purge; keep interstitials low and stress-relieve weld repairs, as Pd is retained in the fusion zone so corrosion resistance is preserved.
Can Grade Ti-Pd18 be formed, bent or molded?
Supplied as investment or rammed-graphite castings poured in vacuum/argon; expect ~1 % shrink allowance, generous fillets, and HIP for pressure-boundary sections — cold forming of castings is not practical.
What surface finishes work on Grade Ti-Pd18?
Grit blast plus nitric-HF pickling to strip alpha case, then passivate; Type II/III anodizing and thermal oxidation both work, and mechanical polish is limited only by residual surface porosity.
Grade Ti-Pd18 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 |
|---|---|---|
| Al | 2.5 – 3.5 | 3 |
| V | 2 – 3 | 2.5 |
| Pdcorrosion-enhancing addition | 0.04 – 0.08 | 0.05 |
| Fe | ≤ 0.25 | 0.12 |
| Ocast product often runs near the upper limit | ≤ 0.15 | 0.11 |
| C | ≤ 0.08 | 0.02 |
| N | ≤ 0.05 | 0.01 |
| H | ≤ 0.02 | 0.01 |
| Residuals (each)total 0.4 max | ≤ 0.1 | — |
| Ti | balance | — |
Grade Ti-Pd18-A — frequently asked
What is Grade Ti-Pd18-A used for?
Grade Ti-Pd18-A is typically used for offshore equipment castings, chemical processing structural parts and aerospace corrosion-critical castings. In short: strongest Pd-alloyed cast titanium; crevice-resistant structural castings; stronger than Ti-Pd17.
What is the yield strength of Grade Ti-Pd18-A?
Grade Ti-Pd18-A has a typical yield strength of 540 MPa (78.3 ksi) and a tensile strength of 660 MPa (95.7 ksi) — weaker than 58% of titanium grades. Strength varies by condition: see the 5 listed tempers.
Is Grade Ti-Pd18-A easy to machine?
Not especially — machinability is rated poor (22/100, worse than 55% of titanium grades). Machine like Ti-6Al-4V but slightly easier: rigid setups, sharp uncoated-carbide or PVD-coated tools, 25–45 m/min, heavy flood coolant, never dwell — and remove the cast alpha case by chem-milling before finish cuts.
Can Grade Ti-Pd18-A be welded?
Yes — weldability is rated very good (80/100). Excellent GTAW/EBW/plasma weldability with matching Grade 18 filler under full argon trailing/back purge; keep interstitials low and stress-relieve weld repairs, as Pd is retained in the fusion zone so corrosion resistance is preserved.
What surface finishes work on Grade Ti-Pd18-A?
Grit blast plus nitric-HF pickling to strip alpha case, then passivate; Type II/III anodizing and thermal oxidation both work, and mechanical polish is limited only by residual surface porosity.
Can Grade Ti-Pd18-A be formed, bent or molded?
Supplied as investment or rammed-graphite castings poured in vacuum/argon; expect ~1 % shrink allowance, generous fillets, and HIP for pressure-boundary sections — cold forming of castings is not practical.
What is the maximum service temperature of Grade Ti-Pd18-A?
Grade Ti-Pd18-A is rated for continuous use to about 315°C (599 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Grade Ti-Pd18-A and Grade Ti-Pd18-F?
A is the default condition — standard supply condition: residual casting stresses removed, stable dimensions and best all-round corrosion/ductility balance. F: lowest-cost condition for thick, lightly loaded corrosion hardware where internal porosity is acceptable. Yield strength is 540 MPa in A versus 525 MPa in F.
Sources
- ASTM B367 Standard Specification for Titanium and Titanium Alloy Castings — ASTM International (2022)
- ASTM B265 / B348 (Grade 18, Ti-3Al-2.5V-0.05Pd) — ASTM International (2020)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials (titanium and Ti-Pd alloys) — ASM International (2005)
- TIMETAL 3-2.5 / Grade 9 & Pd-modified grades data sheet — TIMET (2018)
- Titanium Alloy Guide — RTI International Metals (2000)
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.