Advanced Metals
Ti-6Al-4V (Gr5 and Gr23)
Grade 5, also known as Ti6Al4V, Ti-6Al-4V or Ti 6-4, is the most commonly used alloy. It is significantly stronger than commercially pure titanium while having the same stiffness and thermal properties (excluding thermal conductivity, which is about 60% lower in Grade 5 Ti than in CP Ti). It is a two phase α+β titanium alloy, with aluminum as the alpha stabilizer and vanadium as the beta stabilizer. This high-strength alloy can be used at cryogenic temperatures to about 800°F (427°C). ATI Ti-6Al-4V, Grade 5 alloy is used in the annealed condition and in the solution treated and aged condition. This grade is an excellent combination of strength, corrosion resistance, weld and fabricability.
Ti-6Al-4V Grade 5
This is the most widely used titanium alloy. It has very high strength but relatively low ductility. The main application of this alloy is in aircraft and spacecraft. Offshore use is growing. The alloy is weldable and can be precipitation hardened.
Ti-6Al-4V ELI Grade 23
An alpha-beta alloy based on Grade 5. The amount of interstitial elements (O, N, C) is reduced.
Improved stress corrosion cracking (SCC) properties in seawater compared to Grade 5.
Especially suited for thick wall highly stressed parts.
Chemical composition of Ti-6Al-4V(%, max.)
|
Grade |
UNS |
DIN |
O |
N |
C |
H |
Fe |
Al |
V |
|
Gr5 |
R56400 |
3.7164/5 |
0.20 |
0.05 |
0.08 |
0.015 |
0.40 |
5.50-6.75 |
3.50-4.50 |
|
Gr23 |
R56401 |
3.7145 |
0.13 |
0.03 |
0.08 |
0.0125 |
0.25 |
5.50-6.75 |
3.50-4.50 |
* According to ASTM B265, 348, 338, 861, 862, 863
Classification
UNS
O
N
C
H
Fe
Al
V
ERTi-5
R56402
0.12-0.20
0.03
0.05
0.015
0.22
5.50-6.75
3.50-4.50
ERTi-23
R56408
0.03-0.11
0.012
0.03
0.005
0.20
5.50-6.75
3.50-4.50
* Residual elements total < 0.20%, with single < 0.05%, except for yttrium < 0.005%
* According to AWS A5.16/A5.16M:2007, for titanium welding application
Mechanical properties of Ti-6Al-4V
|
Grade |
Tensile strength |
Yield strength |
Elongation in 4D |
Reduction of area |
Hardness |
|
|
Gr5 |
895 |
828 |
10 |
25 |
330-390 |
|
|
Gr23 |
828 |
759 |
10 |
15 |
350 |
|
* According to ASTM B348
Available forms
● Ingot
● Rod and bar
● Forging
● Plate and sheet
● Wire
● Strip and foil
● Tube and pipe
● Fastener
● Custom-made
Specification
ASTM B265, ASTM B348, ASTM B381, ASTM B338, ASTM B861/862, ASTM B863, ASTM B363
ASTM F136, ASTM F1472
ISO 5832-3
AWS A5.16
AMS 4920, AMS 4928, AMS 4911, AMS 4965, AMS 4967, AMS 4905
MIL-T-9046, MIL-T-9047
Typical application
▲ Aircraft turbines
▲ Engine components
▲ Aircraft structural components
▲ Aerospace fasteners
▲ Biomechanical applications, such as implants and prosthesis
▲ Chemical industry
▲ Gas turbines
▲ High-performance automatic parts
▲ Marine applications
▲ Sports equipments
