Titanium ERTi-9
UNS R56320 · ASTM B863 ERTi-9
ERTi-9 is a Ti-3Al-2.5V (UNS R56320) filler wire to ASTM B863, an alpha-beta lean alloy often described as half-strength Ti-6Al-4V.
Reference datasheet — ERTi-9 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 AW condition
ERTi-9 tempers and conditions
ERTi-9 is supplied in 4 conditions, soft to hard. AW 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 |
|---|---|---|---|---|---|---|
Annealed | Standard supply condition of the filler wire itself — soft, straight-cut TIG rod or level-wound spool for orbital/GMAW feeding. | 550 | 660 | 20 | 24 HRC | — |
as-welded then stress relieved (480–595 °C, vacuum/inert) | Pick when residual stress or distortion in welded Gr.9 tube assemblies must be reduced without softening the joint. | 570 | 680 | 17 | 23 HRC | 1.4 % IACS |
AWDefault As-welded deposit | Default condition: all-weld-metal properties of ERTi-9 deposited with argon/helium shielding, trailing shield and back purge. | 585 | 690 | 15 | 25 HRC | — |
Cold worked and stress relieved wire | Higher-strength, stiffer wire condition sometimes specified for cut-length rods that must resist bending or for matching CWSR Gr.9 tubing chemistry. | 790 | 900 | 12 | 31 HRC | 1.4 % IACS |
What is ERTi-9?
ERTi-9 is a Ti-3Al-2.5V (UNS R56320) filler wire to ASTM B863, an alpha-beta lean alloy often described as half-strength Ti-6Al-4V. Engineers use it to weld Grade 9 titanium tube and pipe where moderate strength gain over CP titanium is wanted without losing formability; it is supplied as spooled wire, straightened cut lengths and orbital-welding coils. Typical deposit properties are 585 MPa yield, 690 MPa tensile and 15% elongation, with a 315 °C service limit, weldability score 90 and corrosion score 88. For higher joint strength use ERTi-5 or ERTi-23; for maximum corrosion resistance use a Pd-bearing filler such as ERTi-11. ERTi-9 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). ERTi-9 has a yield strength of 585 MPa (84.8 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 51% of titanium grades. Elongation at break is 15% and the elastic modulus is 103 GPa (14.9 Msi).
What is ERTi-9 used for?
- Aerospace hydraulic and pneumatic tubing welds
- Bicycle frame welding
- Racing exhaust systems
Advantages
- Readily welded — 90/100, better than 93% of titanium grades
ERTi-9 properties
Typical room-temperature values for ERTi-9-AW; bars are the position among titanium grades.
Physical3
ERTi-9 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
ERTi-9 has a yield strength of 585 MPa (84.8 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 51% of titanium grades. Elongation at break is 15% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
ERTi-9 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
ERTi-9 conducts electricity at 1.4 % IACS, better than 53% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), worse than 77% of titanium grades.
Sustainability4
Producing a kilogram of ERTi-9 takes about 650 MJ of energy and emits 45 kg of CO₂ — less than 75% of titanium grades. Typical recycled content is 15%.
Manufacturability7
ERTi-9's machinability is poor (25/100, better than 53% of titanium grades); weldability excellent (90/100); formability good (65/100).
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. ERTi-9 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ERTi-9
Is ERTi-9 easy to machine?
Weld beads machine like Gr.9 base metal — low speed, high feed, sharp uncoated-carbide or PVD-coated tools and flood coolant to avoid galling and work hardening.
Can ERTi-9 be welded?
GTAW/GMAW/PAW/orbital with 99.995% Ar or Ar-He, trailing shield and full back purge; joint and wire must be degreased and kept below ~250 ppm O pickup — a silver/straw bead is acceptable, blue/grey/white is not.
Can ERTi-9 be formed, bent or molded?
Annealed wire bends and coils readily; drawn-to-size rod is straightened and cut, and welded Gr.9 tube can be cold bent to about 3–4 D after PWHT.
ERTi-9 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 |
| Fe | ≤ 0.25 | 0.15 |
| Okept low for weld ductility | ≤ 0.12 | 0.08 |
| C | ≤ 0.05 | 0.02 |
| N | ≤ 0.02 | 0.01 |
| Hsome purchase specs restrict to 0.008 max | ≤ 0.02 | 0.01 |
| Other, each | ≤ 0.05 | |
| Other, total | ≤ 0.3 | |
| Ti | balance |
What surface finishes work on ERTi-9?
Pickle in HNO₃-HF or bead blast to remove alpha case and heat tint before service; colour anodising and passivation per ASTM F86 give good corrosion and ID marking.
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 ERTi-9 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- R56320
- ASTM
- B863 ERTi-9
How much does ERTi-9 cost?
ERTi-9 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.
ERTi-9 — frequently asked
What is ERTi-9 used for?
ERTi-9 is typically used for aerospace hydraulic and pneumatic tubing welds, bicycle frame welding and racing exhaust systems. In short: standard Grade 9 tube filler; formability with added strength; orbital-weld friendly.
What is the yield strength of ERTi-9?
ERTi-9 has a typical yield strength of 585 MPa (84.8 ksi) and a tensile strength of 690 MPa (100 ksi) — weaker than 51% of titanium grades. Strength varies by condition: see the 4 listed tempers.
Is ERTi-9 easy to machine?
Not especially — machinability is rated poor (25/100, better than 53% of titanium grades). Weld beads machine like Gr.9 base metal — low speed, high feed, sharp uncoated-carbide or PVD-coated tools and flood coolant to avoid galling and work hardening.
Can ERTi-9 be welded?
Yes — weldability is rated excellent (90/100). GTAW/GMAW/PAW/orbital with 99.995% Ar or Ar-He, trailing shield and full back purge; joint and wire must be degreased and kept below ~250 ppm O pickup — a silver/straw bead is acceptable, blue/grey/white is not.
What surface finishes work on ERTi-9?
Pickle in HNO₃-HF or bead blast to remove alpha case and heat tint before service; colour anodising and passivation per ASTM F86 give good corrosion and ID marking.
Can ERTi-9 be formed, bent or molded?
Annealed wire bends and coils readily; drawn-to-size rod is straightened and cut, and welded Gr.9 tube can be cold bent to about 3–4 D after PWHT.
What is the maximum service temperature of ERTi-9?
ERTi-9 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 ERTi-9-AW and ERTi-9 CWSR?
AW is the default condition — default condition: all-weld-metal properties of ERTi-9 deposited with argon/helium shielding, trailing shield and back purge. CWSR: higher-strength, stiffer wire condition sometimes specified for cut-length rods that must resist bending or for matching CWSR Gr.9 tubing chemistry. Yield strength is 585 MPa in AW versus 790 MPa in CWSR.
How much does ERTi-9 cost?
ERTi-9 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
- AWS A5.16/A5.16M — Titanium and Titanium-Alloy Welding Electrodes and Rods — AWS (2013)
- ASTM B863 — Titanium and Titanium Alloy Wire — ASTM International (2022)
- ASTM B348 / B338 — Ti Grade 9 (UNS R56320) bar and tube requirements — ASTM International (2021)
- ASM Handbook Vol.2 — Properties of Nonferrous Alloys (Titanium) — ASM International (1990)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering (Titanium) — ASM International (1993)
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.