Grade 2 Vs Grade 5 Titanium: What’s The Difference?

The main difference between Grade 2 and Grade 5 titanium lies in their composition and mechanical properties: Grade 2 is commercially pure titanium, offering excellent corrosion resistance and formability, while Grade 5 (Ti-6Al-4V) is an alpha-beta alloy strengthened with aluminum and vanadium, providing nearly twice the strength of Grade 2. This fundamental distinction determines their suitability for different applications - from chemical processing to aerospace structures.

1. Chemical Composition

Element	Grade 2 (Commercially Pure)	Grade 5 (Ti-6Al-4V)
Titanium	Balance (≥99%)	Balance
Aluminum	-	5.5–6.75%
Vanadium	-	3.5–4.5%
Iron	≤0.30%	≤0.40%
Oxygen	≤0.25%	≤0.20%
Carbon	≤0.08%	≤0.08%
Nitrogen	≤0.03%	≤0.05%
Hydrogen	≤0.015%	≤0.015%

Key takeaway: The addition of aluminum (as alpha stabilizer) and vanadium (beta stabilizer) in Grade 5 enables heat treatment and age hardening, while Grade 2 relies solely on its pure titanium matrix for properties.

2. Mechanical Properties Comparison

Property	Grade 2	Grade 5 (Ti-6Al-4V)
Tensile Strength	345–550 MPa	895–1000 MPa
Yield Strength (0.2% offset)	275–450 MPa	825–920 MPa
Elongation (break)	20–25%	10–15%
Hardness (Brinell)	~180 HB	~330 HB
Modulus of Elasticity	103 GPa	114 GPa
Fatigue Strength (10⁷ cycles)	~240 MPa	~500 MPa

Why it matters:

Grade 5 is approximately 2x stronger than Grade 2, making it the choice for structural components under high stress.

Grade 2 offers higher ductility, allowing easier bending, flaring, and forming without cracking.

3. Physical Properties

Property	Grade 2	Grade 5
Density (g/cm³)	4.51	4.43
Melting Point (°C)	1660	1604–1660
Thermal Conductivity (W/m·K)	16.4	6.7
Electrical Resistivity (μΩ·m)	0.56	1.78
Magnetic Properties	Non magnetic	Non magnetic

Note: Grade 5 has significantly lower thermal conductivity, which can lead to heat buildup during machining or welding.

4. Corrosion Resistance

Environment	Grade 2	Grade 5
Seawater (ambient)	Excellent	Excellent
5% HCl (room temp)	Fair	Good
10% H₂SO₄ (room temp)	Poor	Fair
Nitric acid (oxidizing)	Excellent	Excellent
Chloride stress corrosion	Resistant	Resistant
High-temperature oxidation (400°C+)	Moderate	Good (up to 500°C)

Both grades perform exceptionally well in seawater and chloride environments due to the stable passive oxide film. However, Grade 5's higher alloy content provides slightly better resistance to reducing acids.

5. Fabrication and Weldability

Aspect	Grade 2	Grade 5
Cold formability	Excellent (can be deeply drawn, bent)	Poor (limited cold forming)
Hot working	Good (850–950°C)	Excellent (900–950°C)
Machinability	Moderate (gummy, requires sharp tools)	Poor (high tool wear, low speeds)
Weldability	Excellent (as-welded strength retained)	Good (needs post-weld stress relief)
Typical welding methods	TIG, MIG, resistance	TIG, MIG, electron beam (with shielding)

TSM Technology's advantage: With 3 factories, 100+ machines, and 14+ years of experience, we offer custom cutting, bending, and welding services for both grades, ensuring precision and quality.

6. Applications: Where Each Grade Excels

Grade 2 Titanium (Commercially Pure)

Chemical processing: Heat exchangers, pressure vessels, piping for mild acids and chlorides

Marine engineering: Seawater cooling systems, desalination plant components, boat hulls

Biomedical: Dental implants, surgical instruments (non load bearing)

Power generation: Condenser tubes, turbine blades (low stress)

Grade 5 Titanium (Ti-6Al-4V)

Aerospace: Airframes, landing gear, engine components, hydraulic tubing

High performance automotive: Connecting rods, valve springs, exhaust systems

Medical implants: Hip stems, bone screws, spinal fixation devices (high strength required)

Oil & gas: Downhole tubing, subsea equipment, high pressure piping

Sporting goods: Golf club heads, bicycle frames, racing wheelchairs

7. Cost Comparison

Factor	Grade 2	Grade 5
Raw material cost	Lower (~$10–15/kg)	Higher (~$20–35/kg)
Machining cost	Moderate	High (tool wear, slow speeds)
Fabrication cost	Lower (easy forming)	Higher (specialized equipment)
Overall project cost	Economical for corrosion applications	Premium for strength-critical uses

8. How TSM Technology Supports Both Grades

At TSM Technology, we manufacture and supply Grade 2 and Grade 5 titanium tubes (seamless and welded), 5 titanium tubes, gr5 titanium tube, Grade 5 Titanium Seamless Tubes, titanium grade 5 seamless tube, Grade 5 seamless titanium tubing, and Gr5 titanium pipe for diverse industries. Our advantages include:

Feature	Benefit
3 factories, 100+ machines	300 tons/month capacity, reliable supply
ASTM/ASME/EN compliance	Full traceability with MTC (EN 10204 3.1)
Customization	Cutting, threading, bending, welding inhouse
Quality	Optional SGS inspection, hydrogen content test
Delivery	10–25 days, free samples available
Payment	T/T, L/C, flexible terms

9. Case Study: TSM Supplies Both Grades for a Marine Project

A recent seawater cooling system upgrade required:

Grade 2 tubes for long, straight runs where formability and corrosion resistance were paramount.

Grade 5 fittings and short high pressure sections where strength was critical.

 

TSM Technology provided:

Grade 2 Seamless Tubes (ASTM B861) – 2000 meters, 50.8mm OD × 2.77mm wall

Grade 5 Welded & Drawn Tubes (ASTM B862) – 500 meters, 25.4mm OD × 3.91mm wall

Full material traceability and hydrostatic test reports

The project was completed on time, with the customer reporting zero corrosion issues after 18 months of operation.

Conclusion

Choosing between Grade 2 and Grade 5 titanium depends entirely on your application's balance of strength, corrosion resistance, formability, and cost. Grade 2 is the go to for chemical and marine environments where forming and welding ease matter most. Grade 5 is the choice for high stress aerospace, medical, and performance engineering applications where strength cannot be compromised.

TSM Technology offers both grades with certified quality, custom processing, and global shipping. Contact us to discuss your specific requirements.

Email: info@tsm-titanium.com

References

ASTM B861 – Standard Specification for Titanium and Titanium Alloy Seamless Pipe. ASTM International.

ASTM B862 – Standard Specification for Titanium and Titanium Alloy Welded Pipe. ASTM International.

Boyer, R., Welsch, G., & Collings, E. W. (1994). Materials Properties Handbook: Titanium Alloys. ASM International.

Donachie, M. J. (2000). Titanium: A Technical Guide. ASM International.

Leyens, C., & Peters, M. (2003). Titanium and Titanium Alloys: Fundamentals and Applications. Wiley-VCH.

Schutz, R. W. (2005). Titanium alloys for marine service. Corrosion: Materials, 13, 527-543.

TSM Technology Internal Product Catalog (2025).