Titanium Grade 2 is the most widely used commercially pure titanium grade and provides an excellent balance of corrosion resistance, strength, ductility and fabricability.
It is stronger than Grade 1 while remaining significantly easier to form than many titanium alloys. This balance makes Grade 2 particularly attractive for chemical-processing, marine and industrial equipment.
Grade 2 is designated UNS R50400.
Grade 2 Chemical Composition
| Element | Weight % |
|---|---|
| Titanium (Ti) | Balance |
| Oxygen (O) | ≤ 0.25 |
| Iron (Fe) | ≤ 0.30 |
| Carbon (C) | ≤ 0.08 |
| Nitrogen (N) | ≤ 0.03 |
| Hydrogen (H) | ≤ 0.015 |
Grade 2 is commercially pure titanium: oxygen, iron, carbon, nitrogen and hydrogen are controlled residual or interstitial elements rather than conventional alloying additions.
Grade 2 Mechanical Properties
Representative minimum annealed properties include:
| Property | Value |
|---|---|
| Ultimate tensile strength | ≥ 345 MPa |
| 0.2% yield strength | ≥ 275 MPa |
| Elongation | ≥ 20% |
| Density | approximately 4.51 g/cm³ |
For some sheet and plate specifications an upper yield-strength limit may also apply.
Corrosion Resistance
Grade 2 develops a stable, adherent titanium-oxide film that provides excellent resistance to many corrosive environments.
It is particularly useful in equipment exposed to seawater, wet chlorine, chloride-bearing solutions and many oxidising chemical-process streams. Suitability for any specific acid, temperature or concentration should nevertheless be checked against application-specific corrosion data.
Fabrication
Grade 2 has good formability and can be fabricated using bending, rolling and forming techniques appropriate for titanium.
It is readily weldable using processes such as GTAW/TIG when the weld zone and hot metal are properly protected from atmospheric contamination.
Typical Applications
- Chemical-process vessels
- Heat exchangers
- Condensers
- Piping systems
- Seawater and marine equipment
- Desalination equipment
- Pressure-containing equipment
- Architectural components
- Medical devices where the applicable material specification permits Grade 2
Common Specifications
- ASTM B265
- ASTM B348
- ASTM F67
- ASME SB-265
- AMS 4902
Technical Note
Chemical and mechanical properties shown are representative of commonly referenced specifications. Requirements can vary by product form, thickness, heat treatment and governing standard. Material should be ordered to the required specification, and the supplied material test report (MTR) should be used to verify compliance.
