Among the many titanium alloys, Titanium Grade 5 (Ti 6Al-4V) and Titanium Grade 2 (Ti CP3) are two widely used materials. Each has unique properties and application areas, suitable for different engineering needs. This article will conduct a comprehensive comparative analysis of these two titanium alloys to help engineers and material selectors make more informed decisions.
Titanium alloy grade 5 or titanium alloy grade 2: Performance comparison
| property | Ti 6Al-4V (UNS R56400) | Ti 6Al-4V (UNS R56400) |
| Metallurgical properties | α-β alloy | α alloy |
| Tensile strength | 895 MPa | 345 MPa |
| Yield strength | 827 MPa | 276 MPa |
| Elongation (ductility) | 10% | 20% |
| Corrosion resistance | Very good | Excellent |
| Creep and stress cracking resistance | High | Not applicable |
| Fatigue resistance | High | Not applicable |
| Operating temperature | -210°C – 400°C | Environment dependent, e.g., up to 316°C in steam and seawater |
| Weldability | Weldable | Weldable |
Property Overview
Ti 6Al-4V: As an α-β alloy, Ti 6Al-4V has high strength and good corrosion resistance. It is suitable for applications that require high strength and moderate corrosion resistance, such as the aerospace and defense industries.
Titanium Grade 2: As an α alloy of commercially pure titanium, Grade 2 has excellent corrosion resistance and good ductility. It is suitable for applications that require high corrosion resistance and good formability, such as chemical and marine industries.
Application Fields
Ti 6Al-4V: Widely used in aerospace, defense, medical, and other fields, it is used to manufacture aircraft parts, implants, etc.
Titanium Grade 2: Widely used in chemical, marine, pharmaceutical, and other fields, used to manufacture storage tanks, pipelines, medical devices, etc.
Conclusion
The choice of titanium alloy grade 5 or titanium alloy grade 2 depends on the specific application requirements. If high strength and moderate corrosion resistance are required, Ti 6Al-4V is a better choice; if high corrosion resistance and good ductility are required, Titanium Grade 2 is more suitable.
