Titanium Grade Comparison: Gr2 vs Gr5 vs Gr23 vs Gr7
Typical minimum properties for the titanium grades we machine, per ASTM B265 plate and B348 bar designations.
| Property | Gr2 (CP) | Gr5 (Ti-6Al-4V) | Gr23 (ELI) | Gr7 (Ti-Pd) |
|---|---|---|---|---|
| Chinese GB (GB/T 3620) | TA2 | TC4 | TC4 ELI | TA9 |
| Tensile min (MPa) | 344 | 950 | 860 | 344 |
| Yield min (MPa) | 275 | 880 | 795 | 275 |
| Elongation min (%) | 20 | 14 | 15 | 20 |
| Density (g/cm3) | 4.51 | 4.43 | 4.43 | 4.51 |
| Weldability | Good | Good, inert shield | Good, inert shield | Good |
| Machinability vs Gr5 | Easier | Reference | Similar to Gr5 | Easier |
| Typical use at KGL | Bodies, housings | Aerospace structure | Surgical instruments | Chemical sensors |
Titanium Grade FAQ
Gr2 or Gr5 for a corrosion-critical housing?
Gr2 keeps full corrosion performance and machines easier; Gr5 (Ti-6Al-4V) carries roughly triple the yield strength. For pure corrosion service Gr2 wins; the moment the part carries structure loads, Gr5.
What does Gr23 ELI change versus Gr5?
Gr23 ELI lowers the oxygen and iron limits, which raises fracture toughness and ductility. It is the standard callout for surgical and implant-adjacent work; for industrial parts Gr5 is the economical choice.
How do you hold +/-0.01 mm on titanium?
Rigid setups, low surface speed with high feed, flood coolant concentrated on the cut zone, and finish passes left after the part has cooled. Datum features are verified on Hexagon or Zeiss CMMs.
Choosing a Titanium Grade?
Send the load case and environment; the quote includes a grade recommendation and FAI scope.
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