Quick Answer
What is Grade 4 titanium?
Grade 4 is the highest-strength commercially pure titanium grade, with 99.0% minimum titanium content and the highest oxygen content (≤ 0.40%) among CP grades. It offers strength approaching that of alloyed titanium grades while retaining the excellent corrosion resistance and biocompatibility characteristic of CP titanium. Grade 4 is widely used in medical devices, chemical processing, and aerospace where moderate strength and full corrosion resistance are required.
Chemical Composition
| Element |
Weight % |
| Titanium (Ti) |
balance (≥ 99.0%) |
| Iron (Fe) |
≤ 0.50 |
| Oxygen (O) |
≤ 0.40 |
| Carbon (C) |
≤ 0.08 |
| Nitrogen (N) |
≤ 0.05 |
| Hydrogen (H) |
≤ 0.015 |
Mechanical Properties
| Property |
Value |
| Density |
4.51 g/cm³ |
| Tensile Strength |
550 MPa (min) |
| Yield Strength (0.2% offset) |
480 MPa (min) |
| Elongation |
15% |
| Hardness |
30 HRC |
| Modulus of Elasticity |
104 GPa |
| Max Service Temperature |
315°C |
| Melting Point |
1668°C |
Applications
- Medical: Orthopaedic external fixation devices, surgical instruments, dental implants (non-load-bearing)
- Chemical Processing: High-strength vessel internals, pump shafts, valve components for corrosive media
- Aerospace: Structural brackets, fasteners, ducting supports
- Industrial: Fasteners, shafts, springs, structural components requiring corrosion resistance
