Titanium ERTi-4 AW-SR
Heat-treated state
ASTM B863 ERTi-4
Choose when residual stress, distortion control or stress-corrosion service in the weldment matters; slightly lowers strength, raises ductility.
Values for the AW-SR condition
Other ERTi-4 tempers and conditions
ERTi-4 is listed in 2 conditions; see the grade overview at ERTi-4.
- AW-SR
- AW
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AW-SRThis page 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 | — |
What is ERTi-4 AW-SR?
ERTi-4 AW-SR is ERTi-4 heat treated to AW-SR — choose when residual stress, distortion control or stress-corrosion service in the weldment matters; slightly lowers strength, raises ductility. ERTi-4 AW-SR has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 60% of titanium grades. Elongation at break is 20% and the elastic modulus is 105 GPa (15.2 Msi). ERTi-4 AW-SR 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). AW is the default condition FabDigit quotes; AW-SR is available on request or by drawing note.
Advantages
- High service temperature — 400°C (752 °F), better than 78% of titanium grades
ERTi-4 AW-SR properties
Typical room-temperature values for ERTi-4 AW-SR; 22 are specific to this condition. Other listed values are ERTi-4 reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
ERTi-4 AW-SR 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 AW-SR has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 60% of titanium grades. Elongation at break is 20% and the elastic modulus is 105 GPa (15.2 Msi).
Thermal6
ERTi-4 AW-SR 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 AW-SR conducts electricity at 2.9 % IACS, better than 58% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (93/100), better than 72% of titanium grades.
Sustainability4
Producing a kilogram of ERTi-4 AW-SR 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 AW-SR's machinability is poor (30/100, better than 64% of titanium grades); weldability excellent (85/100); formability fair (50/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ERTi-4 AW-SR
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.
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.
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 | — |
ERTi-4 AW-SR — frequently asked
What is ERTi-4 AW-SR used for?
ERTi-4 AW-SR 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 AW-SR?
ERTi-4 AW-SR has a typical yield strength of 520 MPa (75.4 ksi) and a tensile strength of 600 MPa (87 ksi) — weaker than 60% of titanium grades. Strength varies by condition: see the 2 listed tempers.
Is ERTi-4 AW-SR easy to machine?
Not especially — machinability is rated poor (30/100, better than 64% 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 AW-SR 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 AW-SR?
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 AW-SR 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 AW-SR?
ERTi-4 AW-SR 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.