Description
UNS R56401 (Titanium alloy 6Al-4V ELI)
UNS R56401 (Titanium alloy 6Al-4V ELI)
Material grades and equivalents Titanium alloy 6Al-4V ELI /UNS R56401
Introduction
Low interstitial version of Titanium alloy 6Al-4V ELI, for maximum toughness. Preferred for marine and cryogenic applications. This grade is normally used in the annealed condition. Titanium alloy 6Al-4V ELI is the preferred choice for the medical implant field.
Stress relief 900-1200°F 1 to 4 hours, air cool. Duplex anneal, bar and forgings: Solution anneal 50-100°F below the beta transus, hold 1 hour minimum, air cool. Then reheat within the range 1300-1400°F, hold 1 hour minimum, air cool. Stress – relief annealing is performed after welding.
Chemistry Composition
Element |
Al |
V |
Fe |
O |
C |
N |
H |
Y |
Others,Each |
Others,Total |
Ti |
MIN |
5.5 |
3.5 |
– |
– |
– |
– |
– |
– |
– |
– |
– |
MAX |
6.5 |
4.5 |
0.25 |
0.13 |
0.08 |
0.03 |
0.0125 |
0.005 |
0.1 |
0.4 |
Balance |
Physical Properties
Density: 0.160 lb/in3 Melting Range: 2370 – 2460°F Beta Transus: 91790+25°F
Minimum Tensile Properties, AMS 4919, Duplex Annealed：
Temperature, °F |
68-212 |
68-600 |
68-1000 |
68-1200 |
68-1500 |
Coefficient* of Thermal Expansion, in/in°F x 10-6 |
9.18 |
9.54 |
10.08 |
10.44 |
10.8 |
Mechanical Properties
Typical hardness Rockwell: C 30-34 Specific minimums, AMS 4931, bar and forging
Representative Tensile Properties, Sheet
Diameter, in |
< 3.0 |
< 3.0 < 4.0 |
< 4.0) < 6.0 |
Tensile Strength, ksi |
125 |
123 |
120 |
0.2 % Yield Strength, ksi |
115 |
110 |
110 |
Elongation, % *L (**ST) |
10 (8) |
10 (8) |
8 (8) |
Reduction of Area, % *L (**ST) |
25 (–) |
20 (15) |
15 (15) |
* Longitudinal ** Short Transverse
Typical Elevated temperature Properties
Temperature, °F |
93 (200) |
149 (300) |
204 (400) |
260 (500) |
Ultimate Tensile Strength, ksi |
843.3 (121) |
772.2 (112) |
723.9 (105) |
657.7 (98) |
0.2 % Yield Strength, ksi |
710.2 (103) |
641.2 (93) |
586.1 (85) |
531.0 (77) |
Elongation, % |
13 |
15 |
16 |
16 |
