The primary differences between Titanium Grades 1, 2, 5, and 7 lie in their material composition (commercially pure vs. alloyed), mechanical strength, and level of corrosion resistance.
| Titanium Grade | Category | Composition | Tensile Strength | Key Characteristics | Common Applications |
|---|---|---|---|---|---|
| Grade 1 (Gr1) | Unalloyed (CP) | Pure Titanium (Lowest O2) | ≈ 240 MPa | Highest ductility and formability; excellent corrosion resistance; lowest strength. | Chemical processing, deep drawing parts, architectural cladding. |
| Grade 2 (Gr2) | Unalloyed (CP) | Pure Titanium (Moderate O2) | ≈ 345 MPa | Best balance of strength, ductility, weldability, and corrosion resistance ("Workhorse"). | Industrial piping, heat exchangers, marine hardware, power generation. |
| Grade 5 (Gr5) | α-β Alloy | Ti-6Al-4V | ≈ 895 MPa | Exceptional strength-to-weight ratio; heat treatable; moderate formability. | Aerospace structures, medical implants, automotive performance parts. |
| Grade 7 (Gr7) | Unalloyed + Alloy | Ti-0.15Pd (Pure Ti + Palladium) | ≈ 345 MPa | Identical mechanical properties to Gr2, but superior resistance to reducing acids and crevice corrosion. | Chemical equipment handling hydrochloric or sulfuric acids, desalinization plants. |