Difference Between Titanium Gr1 and Gr2: Key Properties and Applications

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Titanium is widely used in chemical, medical, and marine engineering due to its excellent corrosion resistance, high strength, and lightweight properties. Among commercially pure titanium (CP titanium), Grade 1 (Gr1) and Grade 2 (Gr2) are the most common grades, with key differences in mechanical properties and applications.

Corrosion resistant titanium alloy plate

1. Composition and Purity

Gr1: Highest purity (≥99.5% titanium), with extremely low impurity content.
Gr2: Slightly lower purity (≥98.9% titanium), containing trace amounts of iron and oxygen to enhance strength.

2. Mechanical Properties Comparison

Property	Gr1	Gr2
Tensile Strength	240-370 MPa	345-480 MPa
Yield Strength	170-300 MPa	275-380 MPa
Elongation	24-30%	20-25%
Hardness (HV)	120-150	150-200

Key Differences:

Gr1 is softer and more ductile, making it ideal for deep drawing and complex forming.
Gr2 offers higher strength, suitable for pressure-bearing or structural components.

3. Corrosion Resistance & Weldability

Both grades provide excellent corrosion resistance (resistant to seawater, acids, and alkalis), though Gr1 has a slight edge in extreme environments due to higher purity.
Weldability: Both Gr1 and Gr2 are easy to weld, but Gr1 offers better weld ductility.

4. Typical Applications

Gr1:
- Chemical equipment linings, electrolytic cells
- Parts requiring high formability (e.g., titanium foil, bellows)
- Architectural cladding (roofing, facades)
Gr2:
- Heat exchangers, piping systems
- Marine engineering (ship components, desalination equipment)
- Medical implants (bone screws, dental devices)

5. How to Choose?

Choose Gr1: For applications requiring extreme formability, high purity, or superior corrosion resistance.
Choose Gr2: For general industrial use where a balance of strength and corrosion resistance is needed (80% of industrial applications use Gr2).

Conclusion

Both Gr1 and Gr2 are commercially pure titanium, but Gr2 sacrifices slight ductility for higher strength, making it the "go-to" choice for most industrial applications. Meanwhile, Gr1 remains irreplaceable in specialized forming or high-purity requirements.

Would you like a more detailed comparison for a specific application? Let us know in the comments!