Titanium Ti Grade 4
UNS R50700 · EN 3.7095 · JIS Class 4 · GB TA4
Ti Grade 4 (R50700, 3.7095, TA4) is the highest-strength commercially pure titanium, developed to ASTM B265/B348 and F67, where strength comes from controlled oxygen and iron rather than alloying additions.
Reference datasheet — Ti Grade 4 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 4 tempers and conditions
Ti Grade 4 is supplied in 6 conditions, soft to hard. Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot Rolled + Annealed | Plate over ~6 mm and forging stock; slightly coarser grain so strength sits nearer the specification minimum, ductility a little higher. | 500 | 600 | 22 | 22 HRC | 3.1 % IACS |
AnnealedDefault mill annealed (sheet, plate, bar, tube) | Default stocked condition: best balance of strength, ductility and corrosion behaviour; meets ASTM B265/B348/F67 Grade 4 minimums. | 520 | 620 | 20 | 24 HRC | — |
Cold Rolled + Annealed | Pick for thin gauge (<4 mm) sheet and strip where surface finish and thickness tolerance matter; properties essentially the annealed values with slightly finer grain. | 540 | 640 | 18 | 25 HRC | 3.1 % IACS |
Stress relieved | Use after heavy forming, straightening or machining to remove residual stress and reduce distortion/SCC risk without losing much strength. | 545 | 640 | 18 | 25 HRC | 3.1 % IACS |
Cold Worked + Stress Relieved | Cold work retained for strength but residual stress removed (typically 480–540 °C); standard for high-strength CP-Ti fasteners and medical bone screws. | 680 | 780 | 13 | 30 HRC | 3 % IACS |
Cold drawn | Highest strength condition for small-diameter bar, wire and fasteners; choose when strength and straightness beat ductility. | 760 | 860 | 10 | 32 HRC | — |
Supply forms, finishes and certifications
Ways Ti Grade 4 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
Welded-Tube | As-Welded Tube | Supply form |
F67 | ASTM F67 Grade 4 | Certification |
What is Ti Grade 4?
Ti Grade 4 (R50700, 3.7095, TA4) is the highest-strength commercially pure titanium, developed to ASTM B265/B348 and F67, where strength comes from controlled oxygen and iron rather than alloying additions. Engineers specify it when strength approaching some alpha alloys is needed with CP-grade corrosion resistance, typically as sheet, plate, bar, forgings and machined fasteners. Its 520 MPa yield and 620 MPa tensile come with the poorest cold formability of the CP grades (formability score 40) and low machinability (score 30), and service is limited to about 300 °C. Where forming governs, drop to Grade 2 or Grade 1; where higher strength is required, move to Ti-6Al-4V. Ti Grade 4 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 4 has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 60% of titanium grades. Elongation at break is 20% and the elastic modulus is 105 GPa (15.2 Msi).
What is Ti Grade 4 used for?
- airframe fittings
- surgical instruments
- cryogenic and pressure components
- fasteners
Advantages
- Conducts heat well — 17 W/m·K (9.82 BTU/hr·ft·°F), better than 84% of titanium grades
- High electrical conductivity — 3.1 % IACS, better than 75% of titanium grades
Ti Grade 4 properties
Typical room-temperature values for Ti Grade 4-Annealed; bars are the position among titanium grades.
Physical3
Ti Grade 4 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 4 has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 60% of titanium grades. Elongation at break is 20% and the elastic modulus is 105 GPa (15.2 Msi).
Thermal6
Ti Grade 4 is rated for continuous service to 300°C (572 °F). It conducts heat at 17 W/m·K (9.82 BTU/hr·ft·°F), better than 84% of titanium grades. Thermal expansion is 8.6 µm/m·K (4.78 µin/in·°F).
Electrical3
Ti Grade 4 conducts electricity at 3.1 % IACS, better than 75% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (92/100), better than 53% of titanium grades.
Sustainability4
Producing a kilogram of Ti Grade 4 takes about 650 MJ of energy and emits 45 kg of CO₂ — less than 75% of titanium grades. Typical recycled content is 30%.
Manufacturability8
Ti Grade 4's machinability is poor (30/100, better than 64% of titanium grades); weldability excellent (85/100); formability fair (40/100).
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 4 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Ti Grade 4
Is Ti Grade 4 easy to machine?
Low surface speed (~20–35 m/min carbide), heavy positive rake, sharp tools, large depth of cut and flood coolant; never dwell — titanium work-hardens, galls and chips can ignite as fine swarf.
Can Ti Grade 4 be welded?
Very good by GTAW/plasma/EB/laser with full argon shielding including trailing shield and back purge; keep surfaces oxide-free and weld metal bright silver, no filler or ERTi-4 filler.
Can Ti Grade 4 be formed, bent or molded?
Cold formability is the poorest of the CP grades — use generous bend radii (≈3–4t), slow rams and expect strong springback; warm forming at 200–400 °C greatly improves results.
Ti Grade 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 |
|---|---|---|
| Nmax per ASTM B265 Gr.4 | ≤ 0.05 | 0.02 |
| C | ≤ 0.08 | 0.02 |
| H0.0125 % max for some product forms | ≤ 0.02 | 0.01 |
| Fe | ≤ 0.5 | 0.3 |
| Oprincipal strengthening interstitial | ≤ 0.4 | 0.34 |
| Residuals (each)total residuals 0.4 % max | ≤ 0.1 | |
| Ti | balance |
What surface finishes work on Ti Grade 4?
Pickle in HNO₃/HF to remove alpha case and heat tint before service; takes Type II colour anodize, hard anodize, electropolish and bead blast well; avoid plating that could cause hydrogen pickup.
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 4 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- R50700
- EN / DIN / Werkstoff-Nr.
- 3.7095
- GB (China)
- TA4
- JIS
- Class 4
How much does Ti Grade 4 cost?
Ti Grade 4 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 4 — frequently asked
What is Ti Grade 4 used for?
Ti Grade 4 is typically used for airframe fittings, surgical instruments, cryogenic and pressure components and fasteners. In short: strongest CP titanium grade; implant-qualified to F67; least formable CP grade.
What is the yield strength of Ti Grade 4?
Ti Grade 4 has a typical yield strength of 520 MPa (75.4 ksi) and a tensile strength of 620 MPa (89.9 ksi) — weaker than 60% of titanium grades. Strength varies by condition: see the 6 listed tempers.
Is Ti Grade 4 easy to machine?
Not especially — machinability is rated poor (30/100, better than 64% of titanium grades). Low surface speed (~20–35 m/min carbide), heavy positive rake, sharp tools, large depth of cut and flood coolant; never dwell — titanium work-hardens, galls and chips can ignite as fine swarf.
Can Ti Grade 4 be welded?
Yes — weldability is rated excellent (85/100). Very good by GTAW/plasma/EB/laser with full argon shielding including trailing shield and back purge; keep surfaces oxide-free and weld metal bright silver, no filler or ERTi-4 filler.
What surface finishes work on Ti Grade 4?
Pickle in HNO₃/HF to remove alpha case and heat tint before service; takes Type II colour anodize, hard anodize, electropolish and bead blast well; avoid plating that could cause hydrogen pickup.
Can Ti Grade 4 be formed, bent or molded?
Cold formability is the poorest of the CP grades — use generous bend radii (≈3–4t), slow rams and expect strong springback; warm forming at 200–400 °C greatly improves results.
What is the maximum service temperature of Ti Grade 4?
Ti Grade 4 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 4 Annealed and Ti Grade 4-CD?
Annealed is the default condition — default stocked condition: best balance of strength, ductility and corrosion behaviour; meets ASTM B265/B348/F67 Grade 4 minimums. CD: highest strength condition for small-diameter bar, wire and fasteners; choose when strength and straightness beat ductility. Yield strength is 520 MPa in Annealed versus 760 MPa in CD.
How much does Ti Grade 4 cost?
Ti Grade 4 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 F67 — Unalloyed Titanium for Surgical Implant Applications — ASTM International (2017)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
- Materials Properties Handbook: Titanium Alloys — ASM International (1994)
- Commercially Pure Titanium Grade 4 datasheet — TIMET / Sandvik (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.