Titanium ERTi-7 AW+SR
Heat-treated state
GB ERTi7
AW+SR = as-welded then stress relieved 540–595 °C, inert/vacuum
Choose when weld residual stress must be lowered (thick sections, close-tolerance vessels) without losing corrosion performance.
Values for the AW+SR condition
Other ERTi-7 tempers and conditions
ERTi-7 is listed in 2 conditions; see the grade overview at ERTi-7.
- 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 540–595 °C, inert/vacuum | Choose when weld residual stress must be lowered (thick sections, close-tolerance vessels) without losing corrosion performance. | 315 | 405 | 26 | 148 HB | 3.1 % IACS |
AWDefault As-welded deposit | Default condition: properties of the deposited ERTi-7 weld metal in the as-welded state, the basis of AWS A5.16 classification. | 330 | 420 | 24 | 155 HB | — |
What is ERTi-7 AW+SR?
ERTi-7 AW+SR is ERTi-7 heat treated to AW+SR — choose when weld residual stress must be lowered (thick sections, close-tolerance vessels) without losing corrosion performance. ERTi-7 AW+SR has a yield strength of 315 MPa (45.7 ksi) and a tensile strength of 405 MPa (58.7 ksi) — weaker than 88% of titanium grades. Elongation at break is 26% and the elastic modulus is 103 GPa (14.9 Msi). ERTi-7 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
- Easy to machine — 42/100, better than 98% of titanium grades
- Readily welded — 92/100, better than 97% of titanium grades
- Tough — resists crack growth — 85 MPa·√m (77.4 ksi·√in), better than 91% of titanium grades
- Forms and bends easily — 78/100, better than 87% of titanium grades
- Ductile — tolerates forming and impact — 26%, better than 86% of titanium grades
Limitations
- High embodied carbon — 48 kg CO₂/kg, worse than 95% of titanium grades
- Low strength — 315 MPa (45.7 ksi), worse than 88% of titanium grades
ERTi-7 AW+SR properties
Typical room-temperature values for ERTi-7 AW+SR; 22 are specific to this condition. Other listed values are ERTi-7 reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
ERTi-7 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-7 AW+SR has a yield strength of 315 MPa (45.7 ksi) and a tensile strength of 405 MPa (58.7 ksi) — weaker than 88% of titanium grades. Elongation at break is 26% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
ERTi-7 AW+SR is rated for continuous service to 315°C (599 °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-7 AW+SR conducts electricity at 3.1 % IACS, better than 75% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (95/100), better than 83% of titanium grades.
Sustainability4
Producing a kilogram of ERTi-7 AW+SR takes about 720 MJ of energy and emits 48 kg of CO₂ — more than 92% of titanium grades. Typical recycled content is 10%.
Manufacturability7
ERTi-7 AW+SR's machinability is fair (42/100, better than 98% of titanium grades); weldability excellent (92/100); formability very good (78/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with ERTi-7 AW+SR
Is ERTi-7 easy to machine?
Rarely machined as a product, but the deposit machines like CP titanium: low speeds, high feed, sharp uncoated or AlTiN carbide, flood coolant, never dwell (work-hardens and galls).
Can ERTi-7 be welded?
GTAW/GMAW/plasma/laser with high-purity argon or helium, trailing shield and back purge; keep interpass below ~150 °C, target silver/straw weld colour and reject blue/grey oxidised beads.
Can ERTi-7 be formed, bent or molded?
Supplied as drawn and annealed wire; coils and feeds well, but keep it grease-free — any hydrocarbon or moisture picked up during handling becomes weld porosity or hydrogen embrittlement.
What surface finishes work on ERTi-7?
Grind or pickle (HNO3-HF) the weld to remove alpha case before service; welds anodize and colour-match Grade 7 base metal, and no plating is needed for corrosion protection.
ERTi-7 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 |
|---|---|---|
| Pdpalladium addition for reducing-acid/crevice corrosion resistance | 0.12 – 0.25 | 0.17 |
| Fe | ≤ 0.2 | 0.06 |
| Oheld below base-metal level to keep weld ductility | ≤ 0.1 | 0.07 |
| C | ≤ 0.03 | 0.01 |
| N | ≤ 0.01 | 0.01 |
| H | ≤ 0.01 | 0 |
| Other, eachresidual elements | ≤ 0.05 | — |
| Other, total | ≤ 0.3 | — |
| Ti | balance | — |
ERTi-7 AW+SR — frequently asked
What is ERTi-7 AW+SR used for?
ERTi-7 AW+SR is typically used for welding Grade 7 chemical process vessels, sulfuric/hydrochloric acid handling equipment, flue gas desulfurization systems and corrosion-critical titanium piping. In short: best crevice-corrosion filler; pd-alloyed CP titanium; reducing-acid weld service.
What is the yield strength of ERTi-7 AW+SR?
ERTi-7 AW+SR has a typical yield strength of 315 MPa (45.7 ksi) and a tensile strength of 405 MPa (58.7 ksi) — weaker than 88% of titanium grades. Strength varies by condition: see the 2 listed tempers.
Is ERTi-7 AW+SR easy to machine?
Not especially — machinability is rated fair (42/100, better than 98% of titanium grades). Rarely machined as a product, but the deposit machines like CP titanium: low speeds, high feed, sharp uncoated or AlTiN carbide, flood coolant, never dwell (work-hardens and galls).
Can ERTi-7 AW+SR be welded?
Yes — weldability is rated excellent (92/100). GTAW/GMAW/plasma/laser with high-purity argon or helium, trailing shield and back purge; keep interpass below ~150 °C, target silver/straw weld colour and reject blue/grey oxidised beads.
What surface finishes work on ERTi-7 AW+SR?
Grind or pickle (HNO3-HF) the weld to remove alpha case before service; welds anodize and colour-match Grade 7 base metal, and no plating is needed for corrosion protection.
Can ERTi-7 AW+SR be formed, bent or molded?
Supplied as drawn and annealed wire; coils and feeds well, but keep it grease-free — any hydrocarbon or moisture picked up during handling becomes weld porosity or hydrogen embrittlement.
What is the maximum service temperature of ERTi-7 AW+SR?
ERTi-7 AW+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.
Sources
- AWS A5.16/A5.16M — Specification for Titanium and Titanium-Alloy Welding Electrodes and Rods — American Welding Society (2013)
- ASTM B265 / B348 — Titanium and Titanium Alloy Strip, Sheet, Plate and Bars (Grade 7, UNS R52400) — ASTM International (2020)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Specialty Handbook: Titanium and Titanium Alloys — ASM International (1994)
- TIMETAL / ATI commercially pure titanium and Ti-Pd grade data sheets — TIMET / ATI (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.