Titanium ERTi-12-SR (Stress relieved)
Heat-treated state
GB ERTi12
Pick when residual stress or hydrogen/stress-corrosion sensitivity matters in heavy-section or formed weldments.
Values for the SR condition
Other ERTi-12 tempers and conditions
ERTi-12 is listed in 2 conditions; see the grade overview at ERTi-12.
- SR
- AW
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SRThis page Stress relieved | Pick when residual stress or hydrogen/stress-corrosion sensitivity matters in heavy-section or formed weldments. | 440 | 540 | 23 | 185 HB | 3.3 % IACS |
AWDefault As-welded deposit | Default condition: undiluted weld metal deposited under full argon shielding, no post-weld heat treatment. | 460 | 560 | 20 | 195 HB | — |
What is ERTi-12-SR?
ERTi-12-SR is ERTi-12 heat treated to SR — pick when residual stress or hydrogen/stress-corrosion sensitivity matters in heavy-section or formed weldments. ERTi-12-SR has a yield strength of 440 MPa (63.8 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 66% of titanium grades. Elongation at break is 23% and the elastic modulus is 103 GPa (14.9 Msi). ERTi-12-SR has a density of 4.51 g/cm³ (0.163 lb/in³), heavier than 57% of titanium grades. It melts at 1,650°C (3,002 °F). AW is the default condition FabDigit quotes; SR is available on request or by drawing note.
Advantages
- Conducts heat well — 19 W/m·K (11 BTU/hr·ft·°F), better than 93% of titanium grades
- High electrical conductivity — 3.3 % IACS, better than 92% of titanium grades
- Ductile — tolerates forming and impact — 23%, better than 76% of titanium grades
ERTi-12-SR properties
Typical room-temperature values for ERTi-12-SR; 22 are specific to this condition. Other listed values are ERTi-12 reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
ERTi-12-SR has a density of 4.51 g/cm³ (0.163 lb/in³), heavier than 57% of titanium grades. It melts at 1,650°C (3,002 °F).
Mechanical15
ERTi-12-SR has a yield strength of 440 MPa (63.8 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 66% of titanium grades. Elongation at break is 23% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
ERTi-12-SR is rated for continuous service to 315°C (599 °F). It conducts heat at 19 W/m·K (11 BTU/hr·ft·°F), better than 93% of titanium grades. Thermal expansion is 9 µm/m·K (5 µin/in·°F).
Electrical3
ERTi-12-SR conducts electricity at 3.3 % IACS, better than 92% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (92/100), better than 53% of titanium grades.
Sustainability4
Producing a kilogram of ERTi-12-SR takes about 650 MJ of energy and emits 40 kg of CO₂ — less than 75% of titanium grades. Typical recycled content is 20%.
Manufacturability7
ERTi-12-SR's machinability is poor (26/100, better than 57% of titanium grades); weldability excellent (88/100); formability good (58/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ERTi-12-SR
Is ERTi-12 easy to machine?
Rarely machined as a consumable; if the deposit is machined use low surface speed, rigid setup, sharp uncoated or AlTiN carbide and flood coolant to avoid galling and ignition of fines.
Can ERTi-12 be welded?
GTAW/GMAW/PAW with 99.995 % argon or Ar-He, trailing shield and full back-purge; keep interpass below ~150 °C, wipe wire with acetone and reject any weld showing straw/blue-plus discolouration.
Can ERTi-12 be formed, bent or molded?
Weldments form like Grade 12 sheet — bend at ≥3–4 t radius cold, or warm-form at 200–300 °C; springback is high and stress relief after forming is recommended.
What surface finishes work on ERTi-12?
Pickle in HNO3-HF or bead-blast plus nitric passivation to restore the oxide; can be colour anodized (AMS 2488) — never grind with iron-contaminated media.
ERTi-12 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 |
|---|---|---|
| Mo | 0.2 – 0.4 | 0.3 |
| Ni | 0.6 – 0.9 | 0.8 |
| Femax per AWS A5.16 filler limit | ≤ 0.2 | 0.08 |
| Oproducers commonly hold ≤0.15 % for weld ductility | ≤ 0.25 | 0.12 |
| C | ≤ 0.03 | 0.01 |
| N | ≤ 0.02 | 0.01 |
| H | ≤ 0.01 | 0 |
| Other, each | ≤ 0.1 | — |
| Other, total | ≤ 0.4 | — |
| Ti | balance | — |
ERTi-12-SR — frequently asked
What is ERTi-12-SR used for?
ERTi-12-SR is typically used for welding Grade 12 heat exchangers, seawater and brine handling equipment, marine piping systems and cost-effective alternative to Pd-alloyed welds. In short: lower-cost corrosion filler; stronger than CP fillers; alternative to ERTi-7.
What is the yield strength of ERTi-12-SR?
ERTi-12-SR has a typical yield strength of 440 MPa (63.8 ksi) and a tensile strength of 540 MPa (78.3 ksi) — weaker than 66% of titanium grades. Strength varies by condition: see the 2 listed tempers.
Is ERTi-12-SR easy to machine?
Not especially — machinability is rated poor (26/100, better than 57% of titanium grades). Rarely machined as a consumable; if the deposit is machined use low surface speed, rigid setup, sharp uncoated or AlTiN carbide and flood coolant to avoid galling and ignition of fines.
Can ERTi-12-SR be welded?
Yes — weldability is rated excellent (88/100). GTAW/GMAW/PAW with 99.995 % argon or Ar-He, trailing shield and full back-purge; keep interpass below ~150 °C, wipe wire with acetone and reject any weld showing straw/blue-plus discolouration.
What surface finishes work on ERTi-12-SR?
Pickle in HNO3-HF or bead-blast plus nitric passivation to restore the oxide; can be colour anodized (AMS 2488) — never grind with iron-contaminated media.
Can ERTi-12-SR be formed, bent or molded?
Weldments form like Grade 12 sheet — bend at ≥3–4 t radius cold, or warm-form at 200–300 °C; springback is high and stress relief after forming is recommended.
What is the maximum service temperature of ERTi-12-SR?
ERTi-12-SR 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-12-AW and ERTi-12-SR?
AW is the default condition — default condition: undiluted weld metal deposited under full argon shielding, no post-weld heat treatment. SR: pick when residual stress or hydrogen/stress-corrosion sensitivity matters in heavy-section or formed weldments. Yield strength is 460 MPa in AW versus 440 MPa in SR.
Sources
- AWS A5.16/A5.16M — Specification for Titanium and Titanium-Alloy Welding Electrodes and Rods — AWS (2013)
- ASTM B265 / B348 — Titanium and Titanium Alloy Strip, Sheet, Plate and Bars (Grade 12, UNS R53400) — ASTM International (2020)
- AWS D1.9/D1.9M — Structural Welding Code, Titanium — AWS (2015)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials (Titanium) — ASM International (2005)
- Titanium Grade 12 (Ti-0.3Mo-0.8Ni) alloy data sheet — TIMET / Baoji Titanium (2021)
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.