Titanium Grade 2 vs Grade 5 (Ti-6Al-4V): When to Use Each
Titanium Grade 2 (CP) is the cost-effective option with excellent corrosion resistance for chemical processing and marine. Grade 5 (Ti-6Al-4V) offers nearly 3x the strength for aerospace and medical implants where performance justifies the higher cost.
Side-by-Side Property Comparison
| Property | Titanium Grade 2 (CP) | Titanium Grade 5 (Ti-6Al-4V) |
|---|---|---|
| Tensile Strength | 345 MPa (50 ksi) | 950 MPa (138 ksi) |
| Yield Strength | 275 MPa (40 ksi) | 880 MPa (128 ksi) |
| Hardness | 200 HV | 334 HV |
| Density | 4.51 g/cm³ | 4.43 g/cm³ |
| Machinability Rating | 30/100 | 22/100 |
| Thermal Conductivity | 16.4 W/m·K | 6.7 W/m·K |
| Melting Point | 1,660 °C | 1,604–1,660 °C |
| Tolerance | ±0.02 mm | ±0.02 mm |
Key Differences
| Property | Titanium Grade 2 (CP) | Titanium Grade 5 (Ti-6Al-4V) | Winner |
|---|---|---|---|
| Tensile Strength | 345 MPa | 950 MPa | Titanium |
| Machinability | 30/100 | 22/100 | Titanium |
| Corrosion Resistance | Excellent | Excellent | Tie |
| Cost | ~$15/lb | ~$25/lb | Titanium |
| Weldability | Excellent | Good | Titanium |
| Fatigue Strength | Moderate | Excellent | Titanium |
Which Material Should You Choose?
Choose Titanium Grade 2 (CP) when:
- Chemical processing equipment
- Marine and offshore components
- Heat exchangers
- Cost-sensitive titanium applications
- Weldability is important
Choose Titanium Grade 5 (Ti-6Al-4V) when:
- Aerospace structural components
- Medical implants (ELI grade)
- High-stress applications
- Motorsport components
- Maximum strength-to-weight ratio
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