Titanium Grade 5, also called Ti-6Al-4V, is the most used titanium alloy, with about 6% aluminium and 4% vanadium. It is about as strong as many alloy steels at roughly 56% of the weight, resists corrosion very well and is biocompatible. It is used for aerospace parts, medical implants, racing and marine parts, but it is costly and slow to machine.
Quick facts
- Type
- Alpha-beta titanium alloy
- Density
- About 4.43 g/cm³
- Tensile strength
- About 900–1,000 MPa (annealed)
- Corrosion
- Excellent, including seawater
- Machinability
- Poor: low speeds, sharp tools, plenty of coolant
- Common forms
- Bar, plate, sheet, forgings
Grade 5 or Grade 2?
| Grade 5 (Ti-6Al-4V) | Grade 2 (pure) | |
|---|---|---|
| Strength | About 900+ MPa | About 345 MPa |
| Formability | Lower | Better |
| Corrosion | Excellent | Excellent |
| Typical use | Structural, implants | Chemical plant, sheet work |
Values are typical. The exact limits depend on the standard and supplier; ask for the mill test certificate when it matters.
Machining tips
- Low cutting speed and steady, generous feed
- Sharp carbide tools with high coolant pressure
- Avoid rubbing: it work-hardens and galls
- Chips can burn: keep chips wet and clean them away
- Rigid setups reduce chatter
Typical uses
- Aircraft brackets and fasteners
- Medical implants and instruments
- Motorsport and cycle parts
- Marine and chemical fittings
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Questions
- Why is titanium hard to machine?
- It conducts heat poorly, so heat stays at the tool edge, and it work-hardens and sticks to tools. Slow speeds and lots of coolant help.
- Is Ti-6Al-4V stronger than steel?
- It is about as strong as many alloy steels but much lighter, so it is stronger for its weight.
- Can Grade 5 titanium be welded?
- Yes, by TIG with full argon shielding of the weld and the hot metal behind it, or it discolours and becomes brittle.
The figures on this page are typical values for guidance, written by Diemeco from standard engineering practice. They are not a specification: confirm grades and properties with the relevant standard or the supplier's mill test certificate, and tolerances with your workshop. Last checked 23 October 2026.