What Is Gr5 Titanium Foil?

Gr5 titanium foil (Ti-6Al-4V), the most widely applied titanium alloy foil, combines high strength, excellent corrosion resistance, and good formability, playing a critical role in aerospace, medical implants, chemical equipment, and electronics manufacturing. With a tensile strength reaching 895-950 MPa-more than twice that of commercially pure titanium (Gr1/Gr2)-Gr5 foil retains the inherent characteristics of titanium alloys, including seawater corrosion resistance and non-magnetic properties. This article provides a comprehensive overview of Gr5 titanium foil across four dimensions: definition, material properties, application areas, and purchasing guidelines.

1. Definition and Standards of Gr5 Titanium Foil

Gr5 titanium foil corresponds to the Ti-6Al-4V alloy in international standards and is a designated grade for titanium alloy sheet and foil under the ASTM B265 standard in the United States. In Chinese standards, Gr5 corresponds to the TC4 alloy. The aluminum content of Gr5 titanium foil ranges from 5.5% to 6.7%, vanadium content from 3.5% to 4.5%, with the balance being titanium. This alpha-beta dual-phase alloy achieves maximized strength through the alpha-stabilizing effect of aluminum and the beta-stabilizing effect of vanadium.

2. Material Properties of Gr5 Titanium Foil

(1) Mechanical Properties

The typical mechanical properties of annealed Gr5 titanium foil are as follows: tensile strength >=895 MPa, yield strength >=825 MPa, elongation >=10%, and hardness HB 330-392. After cold working, tensile strength can be further increased to 1000-1100 MPa.

(2) Corrosion Resistance

Gr5 titanium foil exhibits outstanding corrosion resistance in seawater, chloride solutions, nitric acid, and organic acids. Its corrosion rate in seawater is less than 0.001 mm/year, comparable to commercially pure titanium. Gr5 foil does not suffer from pitting corrosion, crevice corrosion, or stress corrosion cracking.

(3) High-Temperature Performance

Gr5 titanium foil maintains good mechanical properties within the 300-400 degrees C temperature range. At 400 degrees C, its tensile strength retains 85-90% of its room-temperature value. This characteristic makes it an ideal material for medium-to-high temperature applications.

(4) Low-Temperature Performance

Gr5 titanium foil retains excellent toughness at minus 196 degrees C (liquid nitrogen temperature), with an impact absorption energy of no less than 35 J.

Effect of Heat Treatment on Mechanical Properties

3. Typical Applications of Gr5 Titanium Foil

Gr5 titanium foil finds extensive use across multiple high-performance industries:

• Aerospace: compressor blades for aircraft engines, airframe structures, and spacecraft components
• Medical Devices: artificial joints, orthopedic implants, and surgical instruments
• Chemical Equipment: high-pressure reaction vessels, heat exchangers, and pump valves
• Marine Engineering: pressure hulls for deep-sea explorers and seawater desalination equipment
• Sports Equipment: golf club heads, bicycle frames, and tennis rackets

Application Summary

4. Purchasing Guide for Gr5 Titanium Foil

• Standard Selection: ASTM B265 (US), EN 922 (EU), GB/T 3622 (China)
• Thickness Specifications: Standard range: 0.05-3.0 mm; custom sizes available upon request
• Surface Quality: Ra <=1.6 micrometers (finished surface) or Ra <=3.2 micrometers (hot-rolled surface)
• Test Reports: Require suppliers to provide EN 10204 Type 3.1 certificates, including chemical composition, mechanical properties, and non-destructive inspection results
• Supplier Qualifications: Select suppliers with ISO 9001 certification and relevant industry experience

5. Conclusion

Gr5 titanium foil demonstrates irreplaceable value across numerous industrial sectors, thanks to its high strength, excellent corrosion resistance, and favorable machinability. For application scenarios requiring an optimal balance between strength and corrosion resistance, Gr5 titanium foil is the most ideal choice.

FAQ

Q1: What is the difference between Gr5 and Gr2 titanium foil?\nGr5 has a tens strength (>=895 MPa) more than 2.5 times that of Gr2 (>=340 MPa). However, Gr2 offers higher elongation (>=20% vs. >=10%) and better formability. Gr5 is suitable for applications demanding high strength, whereas Gr2 is preferred for applications prioritizing corrosion resistance and formability.

Q2: Can Gr5 titanium foil be welded?\nYes. Gr5 titanium foil can be welded using TIG and MIG processes, but must be performed under argon shielding to prevent high-temperature oxidation. Weld joint strength can reach 85-90% of the base material.

Q3: Why is Gr5 titanium foil more expensive than Gr2?\nGr5 contains alloying elements such as aluminum and vanadium, resulting in higher raw material costs. Additionally, the processing technology for Gr5 is more complex, requiring precise control of heat treatment parameters. Typically, Gr5 is priced at 1.5 to 2 times that of Gr2.

Finding a Reliable Gr5 Titanium Foil Supplier

Baoti Titanium Valley Titanium, Nickel and Zirconium Material Processing Co., Ltd. is a professional manufacturer of high-end rare metal processing products. Equipped with a Danieli rolling production line from Italy, the company produces over 2,000 metric tons of titanium foil annually and offers full-size customization with EN 10204 Type 3.1 certification services. Contact us now for technical support and quotation: sales@titaniumvalleys.com

References

ASTM International. ASTM B265-21 Standard Specification for Titanium and Titanium Alloy Sheet and Plate[S]. West Conshohocken: ASTM International, 2021.

GB/T 3622.1-2017 Titanium and Titanium Alloys – Part 1: Dimensions, Out-of-Squareness, and Tolerances[S]. Beijing: Standards Press of China, 2017.