Grade 23 Ti 6Al 4V ELI Alloy (UNS R56401) for Surgical implants
Oct 22, 2025
GNEE can provide the form
Products Description
Titanium alloys are divided into three main groups: alpha-phase, beta-phase, and alpha-beta-phase. Grade 23 Ti 6Al 4V ELI alloy is an alpha-beta wrought alloy. The ELI stands for extra low interstitial. For an alloy to be branded as an ELI product, it should be produced as such at the mill.
Chemical Composition
| Element | Content (%) |
|---|---|
| Titanium, Ti | 88.09 - 91 |
| Aluminum, Al | 5.5 - 6.5 |
| Vanadium, V | 3.5 - 4.5 |
| Iron, Fe | ≤ 0.25 |
| Carbon, C | ≤ 0.080 |
| Nitrogen, N | ≤ 0.030 |
| Hydrogen, H | ≤ 0.0125 |
| Other, each | ≤ 0.10 |
| Other, total | ≤ 0.40 |
Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 4.43 g/cm3 | 0.160 lb/in3 |
| Melting point | 1604 - 1660°C | 2919 - 3020°F |
Mechanical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 860 MPa | 125000 psi |
| Yield strength | 790 MPa | 115000 psi |
| Poisson's ratio | 0.342 | 0.342 |
| Elastic modulus | 113.8 GPa | 16510 ksi |
| Shear modulus | 44.0 GPa | 6380 ksi |
| Elongation at break | 15% | 15% |
| Hardness, Brinell | 326 | 326 |
| Hardness, Knoop | 354 | 354 |
| Hardness, Rockwell C | 35 | 35 |
| Hardness, Vickers | 341 | 341 |
Thermal Properties
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (@20-100°C/68-212°F) | 8.60 µm/m°C | 4.78 µin/in°F |
| Thermal conductivity | 6.70 W/mK | 46.5 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to grade 23 Ti 6Al 4V ELI alloy are as follows:
AMS 4907
AMS 4931
ASTM F136
ASTM F467 (TI-5)
ASTM F468 (5)
ASTM F468 (S)
MIL F-83142
MIL T-9046
MIL T-9047
SPS M618
AMS 4930
AMS 4956
Fabrication and Heat Treatment
Machinability
Grade 23 Ti 6Al 4V ELI alloy can be machined using slow speeds, right quantity of coolant flow and high feed rates. High-speed tools should be used for tooling this alloy and the recommended tool types are tungsten carbide designations C1-C4 or cobalt based.
Forming
Grade 23 Ti 6Al 4V ELI alloy can be hot or cold formed. Forming techniques include hydropress, stretch or drop-hammer.
Welding
Weldability of grade 23 Ti 6Al 4V ELI alloy is rated as fair.
Heat Treatment
The material can be solution treated at 904-954 °C (1660-1750°F) for 2 h, and then water quenched.
Annealing
For annealing grade 23 Ti 6Al 4V ELI alloy, the material has to be held at 732°C (1350°F) for about 1/4 and 4h. It should then be furnace cooled to 566°C (1050°F) then air cooled.
Forging
Rough forging can be performed at 982°C (1800°F), and completed at 968°C (1750°F).
Hot Working
Hot working enhances the overall ductility of the material.
Cold Working
Cold working features of this material is same as that of austenitic stainless steel. Post-work annealing is recommended to re-attain favorable performance properties.
Aging
Aging of grade 23 Ti 6Al 4V ELI alloy can be performed at 538°C (1000°F) for 4 h and air cooled.
Applications
Grade 23 Ti 6Al 4V ELI alloy is used in the following areas:
Surgical implants
Aircraft components
Structural components
In a variety of salt water applications
In high pressure cryogenic vessels down to -320°C
In applications requiring excellent fracture toughness and fatigue strength.
Products provided by GNEE
| Main Product | Common Grades (ASTM) | Standard Specifications | Common Surface Treatment |
|---|---|---|---|
| Titanium Tube (Seamless & Welded) |
Gr1, Gr2, Gr3, Gr7, Gr9, Gr12 | OD: 3mm - 150 mm Wall Thickness: 0.5mm - 10 mm Length: Up to 6000 mm (customizable) Standards: ASTM B337, ASTM B338 |
• Polished (Mirror / Satin) • Pickled • Annealed • Sandblasted |
| Titanium Sheet/Plate (Cold Rolled / Hot Rolled) |
Gr1, Gr2, Gr5 (Ti-6Al-4V), Gr7, Gr9, Gr12 | Thickness: 0.1mm - 50 mm Width: 500mm - 1500 mm Length: 1000mm - 3000 mm Standards: ASTM B265 |
• Polished (No.4, BA, Mirror) • Pickled • Annealed • Sandblasted • Brushed |
| Titanium Wire | Gr1, Gr2, Gr5, Gr7 | Diameter: 0.1mm - 6.0 mm Form: Coil, Straight Length Standards: ASTM B863, F67, F136 |
• Annealed & Pickled • Bright (Clean) • Oxidized |
| Titanium Bar/Rod (Round, Hex, Square) |
Gr1, Gr2, Gr5 (Ti-6Al-4V), Gr7, Gr9, Gr12 | Diameter (Round): 3mm - 200 mm Hex/Square Size: 4mm - 100 mm Length: 1000mm - 3000 mm (or cut-to-size) Standards: ASTM B348 |
• Turned / Peeled • Polished (Centerless Ground) • Annealed • Black Oxide |
| Titanium Foil | Gr1, Gr2,Gr5 (Ti-6Al-4V), Gr7, Gr9, Gr12 | Thickness: 0.03mm - 0.1 mm Width: 50mm - 500 mm Standards: ASTM B265 |
• Bright Annealed (BA) • Cold Rolled |
| Titanium CNC Machining Parts | Gr1, Gr2, Gr5 (Ti-6Al-4V), Gr7, Gr9, Gr12 | Capability: Custom components based on customer drawings. Processes: Milling, Turning, Drilling, Tapping, etc. |
• As-Machined • Deburred • Polished / Tumbled • Anodizing (Color, Black) • Sandblasted • Passivation |
