Grade 4 (3.7065, R50700) Titanium
Grade 4 titanium is a titanium alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. 3.7065 is the EN numeric designation for this material. R50700 is the UNS number. Additionally, the ASTM designation is Titanium Grade 4.
It has a moderately low embodied energy among the wrought titaniums in the database.
The graph bars on the material properties cards below compare grade 4 titanium to: wrought titaniums (top), all titanium alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Brinell Hardness
200
Elastic (Young's, Tensile) Modulus
110 GPa 15 x 106 psi
Elongation at Break
17 %
Fatigue Strength
340 MPa 50 x 103 psi
Impact Strength: V-Notched Charpy
23 J 17 ft-lb
Poisson's Ratio
0.32
Reduction in Area
28 %
Shear Modulus
41 GPa 5.9 x 106 psi
Shear Strength
390 MPa 57 x 103 psi
Tensile Strength: Ultimate (UTS)
640 MPa 93 x 103 psi
Tensile Strength: Yield (Proof)
530 MPa 77 x 103 psi
Thermal Properties
Latent Heat of Fusion
420 J/g
Maximum Temperature: Mechanical
320 °C 600 °F
Melting Completion (Liquidus)
1660 °C 3020 °F
Melting Onset (Solidus)
1610 °C 2930 °F
Specific Heat Capacity
540 J/kg-K 0.13 BTU/lb-°F
Thermal Conductivity
19 W/m-K 11 BTU/h-ft-°F
Thermal Expansion
9.4 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
3.1 % IACS
Electrical Conductivity: Equal Weight (Specific)
6.3 % IACS
Otherwise Unclassified Properties
Base Metal Price
37 % relative
Density
4.5 g/cm3 280 lb/ft3
Embodied Carbon
31 kg CO2/kg material
Embodied Energy
500 MJ/kg 220 x 103 BTU/lb
Embodied Water
110 L/kg 13 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
100 MJ/m3
Resilience: Unit (Modulus of Resilience)
1330 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
35 points
Strength to Weight: Axial
40 points
Strength to Weight: Bending
37 points
Thermal Diffusivity
7.6 mm2/s
Thermal Shock Resistance
46 points
Alloy Composition
| Ti | 98.6 to 100 | |
| Fe | 0 to 0.5 | |
| O | 0 to 0.4 | |
| C | 0 to 0.080 | |
| N | 0 to 0.050 | |
| H | 0 to 0.015 | |
| res. | 0 to 0.4 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM F67: Standard Specification for Unalloyed Titanium, for Surgical Implant Applications (UNS R50250, UNS R50400, UNS R50550, UNS R50700)
ISO 5832-2: Implants for surgery - Metallic materials - Part 2: Unalloyed titanium
ASTM B381: Standard Specification for Titanium and Titanium Alloy Forgings
ASTM B265: Standard Specification for Titanium and Titanium Alloy Strip, Sheet, and Plate
ASTM B348: Standard Specification for Titanium and Titanium Alloy Bars and Billets
Titanium and Titanium Alloys: Fundamentals and Applications, Christoph Leyens and Manfred Peters (editors), 2003
Titanium, 2nd ed., G. Lutjering and J. C. Williams, 2007
Sintering of Advanced Materials: Fundamentals and Processes, Zhigang Zak Fang (editor), 2010