Titanium Grade 2 (CP Grade 2) – Properties, Applications and Technical Data
Titanium Grade 2 is one of the most widely used commercially pure titanium alloys and offers an optimal balance between strength, corrosion resistance and formability. It is slightly stronger than Titanium Grade 1 but retains excellent weldability and biocompatibility, making it popular in the chemical industry, marine technology, medical technology and energy.
Properties of Titanium Grade 2
Due to its chemical purity and HCP (hexagonal close-packed) structure, Grade 2 combines good strength with very good corrosion resistance, weldability and long service life in demanding environments.
- Type: Commercially pure titanium (≥98.9–99.7 % Ti)
- Purity: High purity, slightly higher strength than Grade 1
- Structure: HCP (hexagonal close-packed)
- Designations: Titanium Grade 2, CP Titanium Grade 2, UNS R50400, ASTM B265, Werkstoffnr 3.7035
- Recommended filler material for welding: AWS A5.16-90 ERTi-2
Advantages
- Very good corrosion resistance in seawater, acids and chloride solutions
- Higher strength than Titanium Grade 1
- Excellent formability and weldability
- Biocompatible - suitable for medical equipment and implants
- Low weight (approx. 45% lighter than steel)
- Good toughness even at low temperatures
Limitations
- Not hardenable by heat treatment
- Lower strength compared to alloyed titanium materials (e.g. Grade 5 / Ti-6Al-4V)
- Not optimal for applications with high mechanical demands at high temperatures
Typical areas of application
Chemical industry
Pipes, tanks and heat exchangers in acid-resistant systems.
Marine & Offshore
Components in seawater-exposed systems, hull parts and cooling systems.
Energy & Power plants
Condensers, process equipment and shell materials with requirements for low weight and corrosion resistance.
Medical technology & Biotechnology
Implants and medical instruments thanks to good biocompatibility.
HVAC & Industrial Systems
Titanium tubes in chlorinated fluids for high durability and long service life.
Corrosion resistance
Titanium Grade 2 develops a stable and dense oxide film that protects against a wide range of corrosive media, including seawater, chlorides and oxidizing acids. The material is also resistant to stress corrosion cracking in most commercial fluids.
Environments where Titan Grade 2 performs well:
- Seawater – both static and flowing
- Chloride solutions and chlorinated water
- Oxidizing acids (dilute hydrochloric acid, sulfuric acid, phosphoric acid)
- Organic acids and hydrogen peroxide
Environments to avoid:
- Hydrofluoric acid (HF) – breaks down the oxide film
- Concentrated sulfuric acid at high temperatures
- Reducing acids at high temperatures without oxygen
Technical data (annealed state)
| Yield strength (0.2%): |
~275–350 MPa |
| Tensile strength: |
~345–485 MPa |
| Elongation at break: |
~20–30% |
| Density: |
~4.51 g/cm³ |
| Modulus of elasticity: |
~105 GPa |
| Thermal conductivity: |
~17 W/m·K |
| Recommended maximum temperature: |
≤300°C (short-term up to 425°C) |
| Weldability: |
Very good – not prone to cracking, recommended material ERTi-2 |
| Machinability: |
Good – requires sharp tools and effective cooling |
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