SCOPE
his specification falls within the ranges of composition and mechanical properties specified in ISO 5832-3 and ASTM F136.
Chemical Composition
Elemental composition requirements
| Element | Composition, % |
| Carbon | 0.08 max. |
| Nitrogen | 0.08 max. |
| Hydrogen | 0.012 max. |
| Iron | 0.25 max. |
| Oxygen | 0.13 max. |
| Aluminum | 5.5-6.5 |
| Vanadium | 3.5-4.5 |
| Titanium | Balance |
Mechanical Properties
Mechanical properties to be determined after annealing are listed in below Table.
The requirements are per ASTM F136 and must be met for acceptance of a material heat lot.
Mechanical property requirements.
| Diameter or thickness, inches | Tensile Strength (min), psi | Yield Strength (min), psi | Elongation, (min) % | Reduction in area* (min), % |
| < 1.75 | 125,000 | 115,000 | 10 | 25 |
| < 1.75 | 125,000 | 113,000 | 10 | 20 |
Mechanical Properties
The microstructure must show fine dispersion of alpha and beta phases in accordance with ASTM F136.
No alpha case may be visible at a magnification of 100x.
The beta temperature must be determined with a suitable method and reported for each heat lot on the material certification.
Straightness of material should be equal to or tighter than the straightness tolerance specified in ASTM B348-13. Maximum straightness allowed for titanium bars is displayed below in Table.
Straightness
Cold-Worked Titanium Bars for Machining – Straightness as per ASTM B348-13