Titanium Grade Ti-Pd18
ASTM B367 Grade Ti-Pd18
Grade Ti-Pd18 is a palladium-modified alpha-beta cast titanium to ASTM B367, carrying wrought Grade 18 chemistry and pairing moderate structural strength with the crevice-corrosion resistance the Pd addition provides.
Reference datasheet — Grade Ti-Pd18 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 A condition
Grade Ti-Pd18 tempers and conditions
Grade Ti-Pd18 is supplied in 5 conditions, soft to hard. A is the default FabDigit quotes; the values on this page are for it.
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 |
ADefault 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?
Grade Ti-Pd18 is a palladium-modified alpha-beta cast titanium to ASTM B367, carrying wrought Grade 18 chemistry and pairing moderate structural strength with the crevice-corrosion resistance the Pd addition provides. Default cast values are 540 MPa yield, 660 MPa tensile, 12 % elongation and 250 HB (26 HRC), with service to 315 °C; F, A, SR, HIP and HIP+A conditions are on file. It suits load- and pressure-carrying castings in chloride or reducing service. Machinability is low (22) and palladium adds cost; choose Ti-Pd17 castings for maximum ductility, or cast Ti-6Al-4V where strength outweighs corrosion demands. Grade Ti-Pd18 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). Grade Ti-Pd18 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).
What is Grade Ti-Pd18 used for?
- offshore equipment castings
- chemical processing structural parts
- aerospace corrosion-critical castings
Limitations
- Limited formability — 20/100, worse than 83% of titanium grades
- Limited ductility — 12%, worse than 78% of titanium grades
Grade Ti-Pd18 properties
Typical room-temperature values for Grade Ti-Pd18-A; bars are the position among titanium grades.
Physical3
Grade Ti-Pd18 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 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 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 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 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'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. 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. Grade Ti-Pd18 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Grade Ti-Pd18
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.
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 |
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.
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 Grade Ti-Pd18 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B367 Grade Ti-Pd18
How much does Grade Ti-Pd18 cost?
Grade Ti-Pd18 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.
Grade Ti-Pd18 — frequently asked
What is Grade Ti-Pd18 used for?
Grade Ti-Pd18 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?
Grade Ti-Pd18 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 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 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?
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 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?
Grade Ti-Pd18 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.
How much does Grade Ti-Pd18 cost?
Grade Ti-Pd18 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
- 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; 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.