Titanium ERTi-4
ASTM B863 ERTi-4
ERTi-4 is the highest-oxygen, highest-strength unalloyed (commercially pure) titanium filler wire in the ASTM B863 family, relying on interstitial oxygen rather than alloy additions for strength.
Reference datasheet — ERTi-4 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-4 tempers and conditions
ERTi-4 is supplied in 2 conditions, soft to hard. AW is the default FabDigit quotes; the values on this page are for it.
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
as-welded then stress relieved (480–595 °C) | Choose when residual stress, distortion control or stress-corrosion service in the weldment matters; slightly lowers strength, raises ductility. | 520 | 600 | 20 | 230 HB | 2.9 % IACS |
AWDefault As-welded deposit | Default condition: undiluted weld metal deposited with full inert-gas shielding, no post-weld heat treatment. | 550 | 620 | 18 | 240 HB | — |
Supply forms, finishes and certifications
Ways ERTi-4 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-Ann | Wire | Supply form |
What is ERTi-4?
ERTi-4 is the highest-oxygen, highest-strength unalloyed (commercially pure) titanium filler wire in the ASTM B863 family, relying on interstitial oxygen rather than alloy additions for strength. It is selected to match Grade 4 base metal in unalloyed titanium weldments and is supplied as spooled MIG wire, straightened cut lengths for TIG, and coiled stock. Deposits typically show 550 MPa yield, 620 MPa tensile and 18% elongation with a service ceiling near 400 °C and a corrosion-resistance score of 92. It has the lowest ductility of the CP fillers and needs full inert-gas shielding; where forming and ductility matter more than strength, ERTi-2 or ERTi-3 is the nearer choice. ERTi-4 has a density of 4.51 g/cm³ (0.163 lb/in³), heavier than 57% of titanium grades. It melts at 1,660°C (3,020 °F). ERTi-4 has a yield strength of 550 MPa (79.8 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 55% of titanium grades. Elongation at break is 18% and the elastic modulus is 105 GPa (15.2 Msi).
What is ERTi-4 used for?
- Welding Grade 4 CP titanium components
- Aerospace fasteners and brackets
- High-strength unalloyed Ti structures
Advantages
- High service temperature — 400°C (752 °F), better than 78% of titanium grades
ERTi-4 properties
Typical room-temperature values for ERTi-4-AW; bars are the position among titanium grades.
Physical3
ERTi-4 has a density of 4.51 g/cm³ (0.163 lb/in³), heavier than 57% of titanium grades. It melts at 1,660°C (3,020 °F).
Mechanical16
ERTi-4 has a yield strength of 550 MPa (79.8 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 55% of titanium grades. Elongation at break is 18% and the elastic modulus is 105 GPa (15.2 Msi).
Thermal6
ERTi-4 is rated for continuous service to 400°C (752 °F). It conducts heat at 16.4 W/m·K (9.48 BTU/hr·ft·°F), better than 71% of titanium grades. Thermal expansion is 8.6 µm/m·K (4.78 µin/in·°F).
Electrical3
ERTi-4 conducts electricity at 2.9 % IACS, better than 58% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (92/100), better than 53% of titanium grades.
Sustainability4
Producing a kilogram of ERTi-4 takes about 620 MJ of energy and emits 40 kg of CO₂ — less than 97% of titanium grades. Typical recycled content is 10%.
Manufacturability8
ERTi-4's machinability is poor (28/100, better than 59% of titanium grades); weldability excellent (85/100); formability fair (45/100).
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-4 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ERTi-4
Is ERTi-4 easy to machine?
Weld deposit machines like CP-Ti: low speed, high feed, flood coolant, sharp uncoated-carbide tools; avoid dwelling to prevent work hardening and galling.
Can ERTi-4 be welded?
GTAW/GMAW/PAW with high-purity argon torch, trailing and backing shielding; keep interpass <150 °C and joint spotlessly clean — straw/blue tint means oxygen pickup and must be removed.
Can ERTi-4 be formed, bent or molded?
Wire is bendable cold but Grade 4 chemistry has the lowest ductility of the CP fillers; weldments generally formed warm (200–400 °C) if at all.
ERTi-4 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 |
|---|---|---|
| Ooxygen is the deliberate strengthener in Grade 4 filler | 0.24 – 0.34 | 0.29 |
| Fe | ≤ 0.25 | 0.15 |
| C | ≤ 0.03 | 0.02 |
| N | ≤ 0.02 | 0.01 |
| Hcritical for weld ductility | ≤ 0.01 | 0 |
| Other, each | ≤ 0.05 | |
| Other, total | ≤ 0.3 | |
| Ti | balance |
What surface finishes work on ERTi-4?
Pickle in HNO₃/HF or abrasive-blast with clean media, then passivate; colour anodising per AMS 2488 II gives durable oxide tints, no plating needed for corrosion.
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-4 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B863 ERTi-4
How much does ERTi-4 cost?
ERTi-4 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-4 — frequently asked
What is ERTi-4 used for?
ERTi-4 is typically used for welding Grade 4 CP titanium components, aerospace fasteners and brackets and high-strength unalloyed Ti structures. In short: strongest CP-Ti filler; matches Grade 4 base metal; lowest ductility CP filler.
What is the yield strength of ERTi-4?
ERTi-4 has a typical yield strength of 550 MPa (79.8 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 55% of titanium grades. Strength varies by condition: see the 2 listed tempers.
Is ERTi-4 easy to machine?
Not especially — machinability is rated poor (28/100, better than 59% of titanium grades). Weld deposit machines like CP-Ti: low speed, high feed, flood coolant, sharp uncoated-carbide tools; avoid dwelling to prevent work hardening and galling.
Can ERTi-4 be welded?
Yes — weldability is rated excellent (85/100). GTAW/GMAW/PAW with high-purity argon torch, trailing and backing shielding; keep interpass <150 °C and joint spotlessly clean — straw/blue tint means oxygen pickup and must be removed.
What surface finishes work on ERTi-4?
Pickle in HNO₃/HF or abrasive-blast with clean media, then passivate; colour anodising per AMS 2488 II gives durable oxide tints, no plating needed for corrosion.
Can ERTi-4 be formed, bent or molded?
Wire is bendable cold but Grade 4 chemistry has the lowest ductility of the CP fillers; weldments generally formed warm (200–400 °C) if at all.
What is the maximum service temperature of ERTi-4?
ERTi-4 is rated for continuous use to about 400°C (752 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between ERTi-4-AW and ERTi-4 AW-SR?
AW is the default condition — default condition: undiluted weld metal deposited with full inert-gas shielding, no post-weld heat treatment. AW-SR: choose when residual stress, distortion control or stress-corrosion service in the weldment matters; slightly lowers strength, raises ductility. Yield strength is 550 MPa in AW versus 520 MPa in AW-SR.
How much does ERTi-4 cost?
ERTi-4 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 (2019)
- ASTM B348 — Titanium and Titanium Alloy Bars and Billets (Grade 4) — ASTM (2021)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials (Titanium) — ASM International (2005)
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.