Titanium ERTi-15
UNS R54520 · ASTM B863 ERTi-15
ERTi-15 is a Ti-5Al-2.5Sn near-alpha filler wire to ASTM B863 (UNS R54520) that matches Grade 6 base metal.
Reference datasheet — ERTi-15 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-15 tempers and conditions
ERTi-15 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 |
|---|---|---|---|---|---|---|
ERTi-15A | Choose for liquid-hydrogen/liquid-helium hardware and any joint needing maximum fracture toughness at -196 to -253 °C. | 745 | 810 | 16 | 31 HRC | — |
Stress relieved | Pick when weld residual stress must be cut for dimensional stability, fatigue or stress-corrosion sensitivity, without softening the joint. | 805 | 870 | 13 | 34 HRC | 1.1 % IACS |
Annealed | Use when the whole weldment is annealed with the Grade 6 base metal to homogenise properties and maximise ductility/toughness. | 807 | 861 | 15 | 33 HRC | — |
AWDefault As-welded deposit | Default condition for most Ti-5Al-2.5Sn joints where residual stress is acceptable and no PWHT furnace is available. | 815 | 880 | 11 | 35 HRC | — |
Supply forms, finishes and certifications
Ways ERTi-15 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
WIRE-CD | Wire as supplied | Supply form |
What is ERTi-15?
ERTi-15 is a Ti-5Al-2.5Sn near-alpha filler wire to ASTM B863 (UNS R54520) that matches Grade 6 base metal. It is used where weld properties must stay stable from cryogenic temperatures up to about 480 °C, and is supplied as TIG cut lengths, spooled wire and ELI-chemistry variants for toughness-critical work. Typical deposits give 815 MPa yield, 880 MPa tensile, 11% elongation and 325 HB, with a corrosion score of 90. Ductility and cold formability are limited by the near-alpha chemistry, and availability is narrower than Ti-6Al-4V fillers; ERTi-5 or ERTi-23 is the usual alternative where high-temperature stability is not required. ERTi-15 has a density of 4.48 g/cm³ (0.162 lb/in³), lighter than 71% of titanium grades. It melts at 1,590°C (2,894 °F). ERTi-15 has a yield strength of 815 MPa (118 ksi) and a tensile strength of 880 MPa (128 ksi) — stronger than 61% of titanium grades. Elongation at break is 11% and the elastic modulus is 110 GPa (16 Msi).
What is ERTi-15 used for?
- Cryogenic tankage welding
- Aerospace airframe components
- High-temperature titanium structures
Advantages
- High service temperature — 480°C (896 °F), better than 90% of titanium grades
Limitations
- Limited ductility — 11%, worse than 87% of titanium grades
ERTi-15 properties
Typical room-temperature values for ERTi-15-AW; bars are the position among titanium grades.
Physical3
ERTi-15 has a density of 4.48 g/cm³ (0.162 lb/in³), lighter than 71% of titanium grades. It melts at 1,590°C (2,894 °F).
Mechanical16
ERTi-15 has a yield strength of 815 MPa (118 ksi) and a tensile strength of 880 MPa (128 ksi) — stronger than 61% of titanium grades. Elongation at break is 11% and the elastic modulus is 110 GPa (16 Msi).
Thermal6
ERTi-15 is rated for continuous service to 480°C (896 °F). It conducts heat at 7.8 W/m·K (4.51 BTU/hr·ft·°F), worse than 53% of titanium grades. Thermal expansion is 9.4 µm/m·K (5.22 µin/in·°F).
Electrical3
ERTi-15 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 ERTi-15 takes about 650 MJ of energy and emits 42 kg of CO₂ — less than 75% of titanium grades. Typical recycled content is 20%.
Manufacturability7
ERTi-15's machinability is poor (22/100, worse than 55% of titanium grades); weldability excellent (85/100); formability fair (35/100).
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-15 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ERTi-15
Is ERTi-15 easy to machine?
Rarely machined as a consumable; the deposited Ti-5Al-2.5Sn machines like Ti-6Al-4V — low speeds (~25–40 m/min carbide), heavy rigid setups, flood coolant, no dwelling to avoid work-hardening and galling.
Can ERTi-15 be welded?
GTAW/GMAW/PAW/EBW with high-purity argon or helium plus trailing shield and backing gas; keep filler and joint degreased and lint-free, interpass <150 °C, and target weld-face color straw or lighter (silver ideal).
Can ERTi-15 be formed, bent or molded?
Weldments are best formed hot (>600 °C) or after full anneal; cold bending is limited to about 4–5 t radius because of the near-α alloy's low ductility and springback.
ERTi-15 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 |
|---|---|---|
| Alα-stabiliser, main solid-solution strengthener | 4.7 – 5.6 | 5.1 |
| Snneutral/α strengthener | 2 – 3 | 2.5 |
| Fe0.25 max for ELI (ERTi-15A) | ≤ 0.4 | 0.2 |
| O0.10 max for ELI grade | ≤ 0.12 | 0.08 |
| C | ≤ 0.05 | 0.02 |
| N | ≤ 0.03 | 0.01 |
| Hcritical for weld ductility | ≤ 0.02 | 0.01 |
| Yyttrium limit for filler metal | ≤ 0.01 | |
| Other, eachresidual elements | ≤ 0.05 | |
| Other, totalresidual elements | ≤ 0.3 | |
| Ti | balance |
What surface finishes work on ERTi-15?
Pickle in HNO₃/HF or grit blast plus pickle to strip alpha case and heat tint; color anodizing works well, and shot peening is used to restore fatigue life on welds.
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-15 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- R54520
- ASTM
- B863 ERTi-15
How much does ERTi-15 cost?
ERTi-15 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-15 — frequently asked
What is ERTi-15 used for?
ERTi-15 is typically used for cryogenic tankage welding, aerospace airframe components and high-temperature titanium structures. In short: cryogenic to 480 °C service; weldable near-alpha alloy; matches Grade 6 base metal.
What is the yield strength of ERTi-15?
ERTi-15 has a typical yield strength of 815 MPa (118 ksi) and a tensile strength of 880 MPa (128 ksi) — stronger than 61% of titanium grades. Strength varies by condition: see the 4 listed tempers.
Is ERTi-15 easy to machine?
Not especially — machinability is rated poor (22/100, worse than 55% of titanium grades). Rarely machined as a consumable; the deposited Ti-5Al-2.5Sn machines like Ti-6Al-4V — low speeds (~25–40 m/min carbide), heavy rigid setups, flood coolant, no dwelling to avoid work-hardening and galling.
Can ERTi-15 be welded?
Yes — weldability is rated excellent (85/100). GTAW/GMAW/PAW/EBW with high-purity argon or helium plus trailing shield and backing gas; keep filler and joint degreased and lint-free, interpass <150 °C, and target weld-face color straw or lighter (silver ideal).
What surface finishes work on ERTi-15?
Pickle in HNO₃/HF or grit blast plus pickle to strip alpha case and heat tint; color anodizing works well, and shot peening is used to restore fatigue life on welds.
Can ERTi-15 be formed, bent or molded?
Weldments are best formed hot (>600 °C) or after full anneal; cold bending is limited to about 4–5 t radius because of the near-α alloy's low ductility and springback.
What is the maximum service temperature of ERTi-15?
ERTi-15 is rated for continuous use to about 480°C (896 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ERTi-15-AW and ERTi-15-ELI?
AW is the default condition — default condition for most Ti-5Al-2.5Sn joints where residual stress is acceptable and no PWHT furnace is available. ELI: choose for liquid-hydrogen/liquid-helium hardware and any joint needing maximum fracture toughness at -196 to -253 °C. Yield strength is 815 MPa in AW versus 745 MPa in ELI.
How much does ERTi-15 cost?
ERTi-15 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 — Specification for Titanium and Titanium-Alloy Welding Electrodes and Rods — AWS (2013)
- ASTM B863 — Standard Specification for Titanium and Titanium Alloy Wire — ASTM International (2021)
- ASTM B265 — Titanium and Titanium Alloy Strip, Sheet, and Plate (Grade 6) — ASTM International (2020)
- Materials Properties Handbook: Titanium Alloys (Ti-5Al-2.5Sn chapter) — ASM International (1994)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
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.