Titanium Ti Grade 7
UNS R52400 · EN 3.7235 · GB TA9
Ti Grade 7 (R52400, 3.7235, TA9) is Grade 1 chemistry with a small palladium addition of about 0.2 %, supplied to ASTM B265/B348 for corrosion service.
Reference datasheet — Ti Grade 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 Annealed condition
Ti Grade 7 tempers and conditions
Ti Grade 7 is supplied in 4 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault mill annealed (ASTM B265/B338/B348 Grade 7) | Standard stocked condition for plate, sheet, tube and bar in corrosion service; best ductility and formability. | 320 | 400 | 25 | 150 HB | — |
Hot worked / as-forged | As-rolled or as-forged heavy sections and flanges where a subsequent full anneal is not specified. | 340 | 425 | 22 | 160 HB | 3.3 % IACS |
As-welded deposit | Property basis for welded tube/pipe and fabricated vessels welded with matching Ti-0.2Pd filler under full inert shielding. | 350 | 430 | 18 | 170 HB | 3.3 % IACS |
Cold worked and stress relieved | Choose when higher strength and tighter tolerance are needed in small tube, bar or wire while keeping Grade 7 corrosion performance. | 470 | 550 | 15 | 200 HB | — |
What is Ti Grade 7?
Ti Grade 7 (R52400, 3.7235, TA9) is Grade 1 chemistry with a small palladium addition of about 0.2 %, supplied to ASTM B265/B348 for corrosion service. The palladium markedly improves resistance to crevice corrosion and reducing acids compared with unalloyed CP titanium, which is why it is chosen for plate, sheet, tube and forged fittings in chemical plant. Strength is modest at 320 MPa yield and 400 MPa tensile with 25 % elongation, service temperature is limited to 300 °C, and the palladium makes it the most expensive CP-family grade. Where crevice risk is lower, Grade 2 is the obvious substitute; Grade 12 gives similar corrosion behaviour at higher strength and lower cost. Ti Grade 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). Ti Grade 7 has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 400 MPa (58 ksi) — weaker than 87% of titanium grades. Elongation at break is 25% and the elastic modulus is 105 GPa (15.2 Msi).
What is Ti Grade 7 used for?
- chemical process equipment in reducing acids
- flue-gas desulfurization components
- heat exchangers
- seawater equipment with crevice risk
Advantages
- Easy to machine — 40/100, better than 93% of titanium grades
- High electrical conductivity — 3.3 % IACS, better than 92% of titanium grades
- Ductile — tolerates forming and impact — 25%, better than 82% of titanium grades
- Tough — resists crack growth — 80 MPa·√m (72.8 ksi·√in), better than 81% of titanium grades
- Forms and bends easily — 72/100, better than 78% of titanium grades
Limitations
- Low strength — 320 MPa (46.4 ksi), worse than 87% of titanium grades
Ti Grade 7 properties
Typical room-temperature values for Ti Grade 7-Annealed; bars are the position among titanium grades.
Physical3
Ti Grade 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
Ti Grade 7 has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 400 MPa (58 ksi) — weaker than 87% of titanium grades. Elongation at break is 25% and the elastic modulus is 105 GPa (15.2 Msi).
Thermal6
Ti Grade 7 is rated for continuous service to 300°C (572 °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
Ti Grade 7 conducts electricity at 3.3 % IACS, better than 92% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (97/100), better than 99% of titanium grades.
Sustainability4
Producing a kilogram of Ti Grade 7 takes about 700 MJ of energy and emits 42 kg of CO₂ — more than 74% of titanium grades. Typical recycled content is 25%.
Manufacturability8
Ti Grade 7's machinability is fair (40/100, better than 93% of titanium grades); weldability excellent (88/100); formability very good (72/100).
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. Ti Grade 7 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Ti Grade 7
Is Ti Grade 7 easy to machine?
Machine like CP Ti: low surface speed, heavy positive-rake sharp tools, rigid setup and flood coolant to avoid galling, work-hardening and chip fires.
Can Ti Grade 7 be welded?
Excellent GTAW/PAW/EBW weldability with matching ERTi-7 filler; requires full argon shielding of pool, root and hot trailing zone to prevent oxygen/hydrogen pickup.
Can Ti Grade 7 be formed, bent or molded?
Good cold formability with generous bend radii (2–3 t) and allowance for springback; warm forming 200–400 °C helps deep draws and hot-formed heads.
Ti Grade 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 |
|---|---|---|
| Pdcathodic depolariser; defines Grade 7 | 0.12 – 0.25 | 0.18 |
| Fe | ≤ 0.3 | 0.15 |
| Omain strengthener | ≤ 0.25 | 0.14 |
| C | ≤ 0.08 | 0.02 |
| N | ≤ 0.03 | 0.01 |
| H0.0125 max for some product forms | ≤ 0.02 | 0.01 |
| Other, eachresiduals | ≤ 0.1 | |
| Other, totalresiduals | ≤ 0.4 | |
| Ti | balance |
What surface finishes work on Ti Grade 7?
Pickle in HNO3/HF after hot work to remove alpha case; can be colour anodised, glass-bead blasted or polished — avoid iron contamination from carbon-steel tooling.
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 Ti Grade 7 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- R52400
- EN / DIN / Werkstoff-Nr.
- 3.7235
- GB (China)
- TA9
- Also called
- Ti-0.2Pd
How much does Ti Grade 7 cost?
Ti Grade 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.
Ti Grade 7 — frequently asked
What is Ti Grade 7 used for?
Ti Grade 7 is typically used for chemical process equipment in reducing acids, flue-gas desulfurization components, heat exchangers and seawater equipment with crevice risk. In short: highest corrosion resistance in family; palladium-stabilized crevice resistance; highest-cost CP grade.
What is the yield strength of Ti Grade 7?
Ti Grade 7 has a typical yield strength of 320 MPa (46.4 ksi) and a tensile strength of 400 MPa (58 ksi) — weaker than 87% of titanium grades. Strength varies by condition: see the 4 listed tempers.
Is Ti Grade 7 easy to machine?
Not especially — machinability is rated fair (40/100, better than 93% of titanium grades). Machine like CP Ti: low surface speed, heavy positive-rake sharp tools, rigid setup and flood coolant to avoid galling, work-hardening and chip fires.
Can Ti Grade 7 be welded?
Yes — weldability is rated excellent (88/100). Excellent GTAW/PAW/EBW weldability with matching ERTi-7 filler; requires full argon shielding of pool, root and hot trailing zone to prevent oxygen/hydrogen pickup.
What surface finishes work on Ti Grade 7?
Pickle in HNO3/HF after hot work to remove alpha case; can be colour anodised, glass-bead blasted or polished — avoid iron contamination from carbon-steel tooling.
Can Ti Grade 7 be formed, bent or molded?
Good cold formability with generous bend radii (2–3 t) and allowance for springback; warm forming 200–400 °C helps deep draws and hot-formed heads.
What is the maximum service temperature of Ti Grade 7?
Ti Grade 7 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Ti Grade 7 Annealed and Ti Grade 7 CW-SR?
Annealed is the default condition — standard stocked condition for plate, sheet, tube and bar in corrosion service; best ductility and formability. CW-SR: choose when higher strength and tighter tolerance are needed in small tube, bar or wire while keeping Grade 7 corrosion performance. Yield strength is 320 MPa in Annealed versus 470 MPa in CW-SR.
How much does Ti Grade 7 cost?
Ti Grade 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
- ASTM B265 — Titanium and Titanium Alloy Strip, Sheet and Plate — ASTM International (2020)
- ASTM B348 — Titanium and Titanium Alloy Bars and Billets — ASTM International (2021)
- ASTM B338 — Seamless and Welded Titanium Tubes for Condensers and Heat Exchangers — ASTM International (2021)
- GB/T 3621 (TA9) — SAC (2022)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Corrosion of Titanium and Titanium Alloys, ASM Handbook Vol.13B — ASM International (2005)
- Titanium Grade 7 (Ti-0.2Pd) alloy datasheet — TIMET / Sandvik (2020)
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.