What Are The Differences Between Grade 1 And Grade 5 Titanium Tubes?

The primary differences between Grade 1 and Grade 5 titanium tubes lie in their composition, strength, ductility, and corrosion resistance. Grade 1 is commercially pure titanium with excellent ductility and formability, ideal for applications requiring extensive cold working. Grade 5 (Ti-6Al-4V) is an alpha-beta alloy strengthened with aluminum and vanadium, offering nearly three times the tensile strength but with reduced ductility. These distinct characteristics determine their suitability for various industries, from chemical processing to aerospace engineering.

1. Chemical Composition

Element	Grade 1 (Commercially Pure)	Grade 5 (Ti-6Al-4V)
Titanium	Balance (≥99.5%)	Balance
Aluminum	-	5.5–6.75%
Vanadium	-	3.5–4.5%
Oxygen	≤0.18%	≤0.20%
Iron	≤0.20%	≤0.40%
Carbon	≤0.08%	≤0.08%
Nitrogen	≤0.03%	≤0.05%
Hydrogen	≤0.015%	≤0.015%

2. Mechanical Properties Comparison

Property	Grade 1	Grade 5 (Ti-6Al-4V)
Tensile Strength	240 MPa (min)	895–1000 MPa
Yield Strength (0.2% offset)	170 MPa (min)	825–920 MPa
Elongation (break)	24–30%	10–15%
Hardness (Brinell)	~120 HB	~330 HB
Modulus of Elasticity	103 GPa	114 GPa
Fatigue Strength (10⁷ cycles)	~170 MPa	~500 MPa

3. Physical Properties

Property	Grade 1	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	Nonmagnetic	Nonmagnetic

4. Corrosion Resistance

Environment	Grade 1	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)

5. Fabrication and Weldability

Aspect	Grade 1	Grade 5
Cold formability	Excellent (can be deeply drawn, bent, flared)	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 (aswelded strength retained)	Good (requires postweld stress relief)
Typical welding methods	TIG, MIG, resistance	TIG, MIG, electron beam (with inert shielding)

 

7. Cost Comparison

Factor	Grade 1	Grade 5
Raw material cost	Lower (~$8–12/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 strengthcritical uses

8. Choosing the Right Grade for Your Project – A Quick Guide

If you need	Choose Grade 1	Choose Grade 5
Maximum corrosion resistance in seawater	✅	✅ (but overkill)
Easy bending, flaring, or deep drawing	✅	❌
High tensile strength (>800 MPa)	❌	✅
Good weldability without post-treatment	✅	⚠️ (requires PWHT)
Lightweight structural component	❌	✅
Costeffective for large diameter pipes	✅	❌
High fatigue resistance (e.g., rotating parts)	❌	✅

9. How TSM Technology Supports Both Grades

At TSM Technology, we manufacture and supply Grade 1 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 in-house
Quality	Optional SGS inspection, hydrogen content test
Delivery	10–25 days, free samples available
Payment	T/T, L/C, flexible terms

10. Case Study: TSM Supplies Both Grades for a Chemical Plant

A recent expansion of a chlor-alkali plant required:

Grade 1 tubes for the main seawater intake line (600 meters, 168mm OD × 3.0mm wall) – chosen for excellent formability and corrosion resistance.

Grade 5 fittings and short spools for the high-pressure chlorine feed system – required for strength and fatigue resistance.

 

TSM Technology provided:

Grade 1 Seamless Tubes (ASTM B861) with hydrostatic testing

Grade 5 Welded & Drawn Tubes (ASTM B862) with full radiography

Complete material traceability and third-party inspection reports

The plant has operated for 24 months without any tube-related failures.

Contact us

Choosing between Grade 1 and Grade 5 titanium tubes depends entirely on your application's balance of strength, formability, corrosion resistance, and budget. Grade 1 is the optimal choice for chemical, marine, and architectural applications where ease of forming and welding is critical. Grade 5 is the go-to material 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.

Lutjering, G., & Williams, J. C. (2007). Titanium (2nd ed.). Springer.

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

TSM Technology Internal Product Catalog (2025).