Grade 2 Titanium vs Titanium Grade 5
Jan 16, 2026
Titanium's reputation as a "wonder metal" stems from its unique combination of strength, lightness, and corrosion resistance. However, not all titanium is created equal. Titanium Grade 2 (pure titanium) and Grade 5 (Ti-6Al-4V alloy) are two of the most widely used titanium grades, yet their properties and applications vary drastically. This article provides a comprehensive, technical comparison of these grades, empowering engineers, manufacturers, and designers to make informed material choices.
Overview of Titanium Grades - Titanium Grade 2 vs Grade 5
Titanium Grade 2 (UNS R50400)
Type: Commercially pure (CP) titanium (α-phase structure).
Composition: ≥99.2% titanium, with oxygen (≤0.25%), iron (≤0.30%), and carbon (≤0.08%) as primary impurities.
Standards: ASTM B265 (sheet/plate), ASTM B338 (tubes).
Titanium Grade 5 (UNS R56400)
Type: Alpha-beta titanium alloy (Ti-6Al-4V).
Composition: 90% titanium, 6% aluminum, 4% vanadium.
Standards: ASTM B348 (bars/billets), AMS 4928 (aerospace).
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Key Differences: Titanium Grade 2 vs Grade 5
Chemical Composition
| Element | Grade 2 | Grade 5 |
|---|---|---|
| Titanium (Ti) | ≥99.2% | 90% |
| Aluminum (Al) | – | 6% |
| Vanadium (V) | – | 4% |
| Oxygen (O) | ≤0.25% | ≤0.20% |
| Iron (Fe) | ≤0.30% | ≤0.40% |
Mechanical Properties
| Property | Grade 2 | Grade 5 |
|---|---|---|
| Tensile Strength | 345–550 MPa (50–80 ksi) | 895–930 MPa (130–135 ksi) |
| Yield Strength | 275–483 MPa (40–70 ksi) | 828–869 MPa (120–126 ksi) |
| Elongation at Break | 20–30% | 10–15% |
| Fatigue Strength | 300 MPa (43.5 ksi) | 500 MPa (72.5 ksi) |
| Hardness | 80–90 HRB | 36–41 HRC |
| Fracture Toughness | 70 MPa√m | 55 MPa√m |
Corrosion Resistance
Grade 2: Exceptional resistance to chlorides, acids (e.g., nitric, acetic), and seawater. Ideal for chemical processing and marine environments.
Grade 5: Slightly reduced corrosion resistance due to alloying elements but still outperforms stainless steel. Avoid in reducing acids (e.g., HCl).
Temperature Performance
Grade 2: Loses strength above 300°C (572°F). Max service temperature: 400°C (752°F).
Grade 5: Retains 80% of room-temperature strength at 450°C (842°F). Used in jet engines and high-temperature exhaust systems.
Machinability & Weldability
| Process | Grade 2 | Grade 5 |
|---|---|---|
| Machinability | Easy (similar to 304 stainless steel) | Difficult (requires carbide tools, coolants) |
| Weldability | Excellent (TIG, plasma, laser) | Good (post-weld heat treatment needed) |
| Formability | High (ductile) |
Limited (prone to springback) |
Cost Comparison
Grade 2: 20–40 per kg (lower raw material and processing costs).
Grade 5: 80–150 per kg (costly alloying, thermal treatments, and machining).
Industrial Applications - Titanium Grade 2 vs Grade 5
Titanium Grade 2 Use Cases
Chemical Processing: Reactor vessels, heat exchangers (resistant to sulfuric and nitric acids).
Marine Engineering: Ship hulls, offshore rig components, desalination plants.
Architecture: Roofing, façades (lightweight and corrosion-proof).
Medical: Non-load-bearing implants (e.g., cranial plates, dental abutments).
Titanium Grade 5 Use Cases
Aerospace: Jet engine fan blades (Boeing 787), airframe fasteners, landing gear.
Biomedical: Load-bearing implants (hip stems, spinal rods) using Grade 5 ELI (Extra Low Interstitial).
Automotive: Connecting rods (Porsche 911 GT3), high-performance exhaust systems.
Energy: Turbine blades for geothermal and nuclear power plants.
How to Choose Between Grade 2 and Grade 5
| Requirement | Choose Grade 2 If… | Choose Grade 5 If… |
|---|---|---|
| High Strength | – | ✓ (Critical for structural loads) |
| Corrosion Resistance | ✓ (Aggressive chemical environments) | ✓ (Moderate environments) |
| Budget | ✓ (Cost-sensitive projects) | – |
| High-Temperature Service | – | ✓ (>300°C applications) |
| Biocompatibility | ✓ (Non-load-bearing implants) | ✓ (Load-bearing ELI variants) |
Hybrid Solutions
Cladding: Grade 2 cladding over Grade 5 substrates for marine hardware (corrosion resistance + strength).
Additive Manufacturing: 3D-printed Grade 5 components with Grade 2 coatings for chemical reactors.
FAQs: Titanium Grade 2 vs Grade 5
01 - Can Grade 2 be heat-treated to increase strength?
No. Grade 2's strength can only be improved via cold working (e.g., rolling, forging).
02 - Is Grade 5 titanium magnetic?
No. Both grades are non-magnetic.
03 - Which grade is better for seawater applications?
Grade 2, due to its superior corrosion resistance in chloride-rich environments.
04 - Why is Grade 5 used in medical implants if Grade 2 is purer?
Grade 5 ELI (Extra Low Interstitial) minimizes alloying element risks while providing the strength needed for load-bearing implants.
05 - Can these grades be welded together?
Yes, but it requires specialized techniques like electron beam welding to avoid brittle intermetallic phases.
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