Comparison Between Grade 5 (Ti-6Al-4V) and Grade 2 (CP Ti) Titanium
Dec 10, 2025
Material Composition & Key Properties
What is titanium?
Titanium is a chemical element with the symbol Ti and atomic number 22. It is a silvery-white transition metal. Titanium is characterized by its light weight, high strength, metallic luster, and good corrosion resistance (including seawater, aqua regia, and chlorine). Due to its chemical stability, resistance to high and low temperatures, strong acids and alkalis, high strength, and low density, it is often used in the manufacture of rockets and spacecraft, and is also known as "space metal."
| Property | Grade 5 (Ti-6Al-4V) | Grade 2 (CP Ti) |
|---|---|---|
| Composition | 90% Ti, 6% Al, 4% V | 99%+ Pure Titanium |
| Tensile Strength | 900-1000 MPa (130-145 ksi) | 345-480 MPa (50-70 ksi) |
| Yield Strength | 830-900 MPa (120-130 ksi) | 275-380 MPa (40-55 ksi) |
| Elongation (%) | 10-15% | 20-30% |
| Hardness (HV) | 330-380 | 160-200 |
| Fatigue Strength | High (Excellent for dynamic loads) | Moderate (Less fatigue-resistant) |
Key Takeaways:
Grade 5 is ~3x stronger than Grade 2, making it ideal for high-stress applications.
Grade 2 is more ductile, allowing better formability and impact resistance.
Grade 5 is harder, providing better wear resistance but is more difficult to machine.
Corrosion Resistance & Environmental Suitability
| Factor | Grade 5 (Ti-6Al-4V) | Grade 2 (CP Ti) |
|---|---|---|
| General Corrosion | Excellent (better than stainless steel) | Even better (most corrosion-resistant pure Ti grade) |
| Crevice Corrosion | Slightly susceptible in chloride-rich environments (e.g., seawater) | Highly resistant |
| Galvanic Corrosion | Can occur when coupled with aluminum/magnesium (requires anti-seize) | Less prone |
| Biocompatibility | Good (used in medical implants) | Best (most biocompatible, used in surgical tools) |
Key Takeaways:
Grade 2 is superior in harsh chemical/sea environments (e.g., marine applications).
Grade 5 is better for structural applications where strength is prioritized over extreme
corrosion resistance.
Applications & Use Cases
Grade 5 (Ti-6Al-4V) Bolts – Where Strength Matters
Aerospace (aircraft frames, jet engines)
High-performance motorsports (F1, MotoGP)
Medical implants (bone screws, dental posts)
Military & defense (armor plating, submarine components)
High-stress bicycle/automotive parts (cranksets, suspension bolts)
Grade 2 (CP Ti) Bolts – Where Corrosion Resistance & Formability Matter
Marine & offshore (boat fittings, underwater fasteners)
Chemical processing (reactors, piping systems)
Medical devices (non-load-bearing implants, surgical instruments)
Consumer goods (eyeglass frames, jewelry, camping gear)
Food processing (non-reactive with acidic/alkaline substances)
Machinability & Cost Comparison
| Factor | Grade 5 (Ti-6Al-4V) | Grade 2 (CP Ti) |
|---|---|---|
| Machinability | Difficult (harder, abrasive) | Easier (softer, less tool wear) |
| Thread Rolling | Possible but requires high-pressure equipment | Easier to roll (better ductility) |
| Cost | $$$ (2-3x more expensive) | $ (More affordable) |
Key Takeaways:
Grade 2 is cheaper and easier to machine, making it better for mass production.
Grade 5 requires specialized tools (carbide cutters, high-pressure thread rolling).
Which One Should You Choose?
Choose Grade 5 (Ti-6Al-4V) if:
You need maximum strength-to-weight ratio.
The bolts will face high dynamic loads (e.g., racing, aerospace).
Wear resistance is critical (e.g., rotating parts).
Choose Grade 2 (CP Ti) if:
Corrosion resistance is the top priority (e.g., marine, chemical exposure).
Biocompatibility is needed (medical/dental applications).
Cost is a concern (budget-friendly alternative to stainless steel).
why choose us
We provide a comprehensive range of titanium materials and fabricated parts, including:
Titanium Tubes & Pipe: Seamless and welded tubing in commercial and aerospace grades (Gr1, Gr2, Gr5, Gr7, Gr9, Gr12), suitable for heat exchangers, condenser tubes, and piping systems.
Titanium Bars & Rods: Round bars, hex bars, and square bars in hot-rolled, forged, and cold-drawn conditions, available in various diameters and lengths.
Titanium Plate & Sheet: Plates, sheets, and strips in standard and custom dimensions, ideal for pressure vessels, chemical processing, and marine applications.
Titanium Wire & Foil: Fine wire for welding, fasteners, and medical applications, alongside ultra-thin foil for specialized industrial uses.
Precision Titanium CNC Machining Parts: Custom-engineered components, fittings, flanges, fasteners, and intricate parts machined from titanium billets, bars, or plates with tight tolerances.
For quotes, technical specifications, or to discuss your project requirements for titanium tubes, bars, plates, sheets, wire, foil, or custom CNC machined components, please contact our team.
Email us at: info@gneemetal.com
