Ti-6Al-4V ELI (ASTM Grade 23 Titanium, UNS R56401) is a high-purity version of Ti-6Al-4V (Grade 5), with lower interstitial elements (oxygen, nitrogen, iron) to enhance ductility and fracture toughness. It is classified as a medium-to-high strength general-purpose alloy, renowned for superior damage tolerance, biocompatibility, and a balanced combination of high strength, lightweight properties, and corrosion resistance.
Key Distinction: Compared to Grade 5, Grade 23 offers better ductility, fracture toughness, and fatigue strength, making it ideal for critical applications like medical implants and high-performance aerospace components.
Chemical Composition (Weight %)
Component
Content Range
Al
5.5 – 6.5
V
3.5 – 4.5
C
Max 0.08
Fe
Max 0.25
H
Max 0.0125
N
Max 0.03
O
Max 0.13
Ti
88.1 – 91 (balance)
Physical Properties
Property
Metric
English
Comments
Density
4.42 g/cc
0.16 lb/in³
Typical
Electrical Resistivity
0.000168 ohm-cm
0.000168 ohm-cm
Magnetic Permeability
1.00005
1.00005
At 20 oersteds
Mechanical Properties
Property
Metric
English
Notes
Tensile Strength (Ultimate)
Min 860 MPa
Min 125,000 psi
Longitudinal
Tensile Strength (Yield, 0.2%)
Min 795 MPa
Min 115,000 psi
Longitudinal
Elongation at Break
Min 10%
Min 10%
Longitudinal
Reduction of Area
Min 25%
Min 25%
Longitudinal; for 0.187–<1.75 inch material
Modulus of Elasticity
105 – 120 GPa
15,200 – 17,400 ksi
Typical
Poisson’s Ratio
0.31
0.31
Shear Modulus
41 – 45 GPa
5,950 – 6,530 ksi
Minimum Bend Radius
5t
5t
For 0.078 in (2 mm) sheet
Thermal Properties
Property
Metric
English
Range
Linear CTE (20°C)
9 μm/m-°C
5 μin/in-°F
0 – 100°C
Linear CTE (250°C)
9.4 μm/m-°C
5.22 μin/in-°F
20 – 425°C
Linear CTE (500°C)
9.7 μm/m-°C
5.39 μin/in-°F
20 – 650°C
Specific Heat Capacity
0.586 J/g-°C
0.14 BTU/lb-°F
Melting Point (Liquidus)
Min 1636°C; 1674°C
Min 2980°F; 3050°F
Maximum Service Temp (Air)
350°C
662°F
Retains mechanical properties
Beta Transus Temperature
982°C
1800°F
Standards & Applications
1. Key Specification
ASTM F136 (biomedical applications)
UNS R56401
2. Typical Applications
Medical/Dental: Surgical implants (e.g., orthopedic, dental) due to biocompatibility and fatigue strength.
Aerospace: Aircraft structural components requiring high toughness and fracture resistance.
Extreme Environments: Saltwater applications, high-pressure cryogenic vessels (down to -320°C).
General Engineering: Components needing a balance of strength, lightweight, and corrosion resistance.
Available Product Forms
Bar, billet, extrusions, plate, sheet, strip, and wire.
