Titanium ERTi-7
GB ERTi7
ERTi-7 is palladium-alloyed commercially pure titanium filler, UNS R52400, matching Grade 7 base metal for welds that must resist crevice corrosion in reducing acids.
Reference datasheet — ERTi-7 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-7 tempers and conditions
ERTi-7 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 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 | — |
Supply forms, finishes and certifications
Ways ERTi-7 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
ANN-WIRE | Annealed wire/rod as supplied | Supply form |
CUT | Cut-length TIG rod | Surface finish |
SPOOL | Spooled wire for GMAW / laser / hot-wire and automatic orbital welding | Surface finish |
What is ERTi-7?
ERTi-7 is palladium-alloyed commercially pure titanium filler, UNS R52400, matching Grade 7 base metal for welds that must resist crevice corrosion in reducing acids. It is supplied as annealed spooled wire and cut lengths, with typical deposit values of 330 MPa yield, 420 MPa tensile, 24% elongation and 155 HB, a weldability score of 92 and a corrosion resistance score of 95. Strength is the lowest of the CP fillers and service is limited to about 315 °C; the palladium content makes it the most expensive option, so ERTi-12 is the usual substitute when crevice resistance requirements are less severe. ERTi-7 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-7 has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 420 MPa (60.9 ksi) — weaker than 83% of titanium grades. Elongation at break is 24% and the elastic modulus is 103 GPa (14.9 Msi).
What is ERTi-7 used for?
- Welding Grade 7 chemical process vessels
- Sulfuric/hydrochloric acid handling equipment
- Flue gas desulfurization systems
- Corrosion-critical titanium piping
Advantages
- Readily welded — 92/100, better than 97% of titanium grades
- Easy to machine — 40/100, better than 93% of titanium grades
- Forms and bends easily — 75/100, better than 83% of titanium grades
- Tough — resists crack growth — 80 MPa·√m (72.8 ksi·√in), better than 81% of titanium grades
- Ductile — tolerates forming and impact — 24%, better than 77% of titanium grades
Limitations
- High embodied carbon — 48 kg CO₂/kg, worse than 95% of titanium grades
- Low strength — 330 MPa (47.9 ksi), worse than 83% of titanium grades
ERTi-7 properties
Typical room-temperature values for ERTi-7-AW; bars are the position among titanium grades.
Physical3
ERTi-7 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 has a yield strength of 330 MPa (47.9 ksi) and a tensile strength of 420 MPa (60.9 ksi) — weaker than 83% of titanium grades. Elongation at break is 24% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
ERTi-7 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 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 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's machinability is fair (40/100, better than 93% of titanium grades); weldability excellent (92/100); formability very good (75/100).
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-7 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with ERTi-7
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.
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 |
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.
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-7 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- GB (China)
- ERTi7
- Similar grades
- R52400
How much does ERTi-7 cost?
ERTi-7 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-7 — frequently asked
What is ERTi-7 used for?
ERTi-7 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?
ERTi-7 has a typical yield strength of 330 MPa (47.9 ksi) and a tensile strength of 420 MPa (60.9 ksi) — weaker than 83% of titanium grades. Strength varies by condition: see the 2 listed tempers.
Is ERTi-7 easy to machine?
Not especially — machinability is rated fair (40/100, better than 93% 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 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?
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 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?
ERTi-7 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.
How much does ERTi-7 cost?
ERTi-7 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 — 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; 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.