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Most Commonly Used Titanium and Titanium Alloys

Generally, there are 8 grades of titanium and titanium alloys that are most commonly used in industrial applications in which corrosion resistance is often of primary concern. Among these titanium materials, titanium Grade 1, Grade 2, Grade 3, and Grade 4 are known as unalloyed titanium or commercially pure titanium, while titanium Grade 5, Grade 7, Grade 9, and Grade 12 are known as titanium alloys. The UNS designation, nominal composition, and crystal microstructure (phase types) are listed in below table.

 

ASTM / ASME
Grade
UNS
Designation
Nominal
Composition
Phase Types
Grade 1R50250Unalloyed Titaniumα
Grade 2R50400Unalloyed Titaniumα
Grade 3R50550Unalloyed Titaniumα
Grade 4R50700Unalloyed Titaniumα
Grade 5R56400Ti-6Al-4Vα+β
Grade 7R52400Ti-0.15Pdα
Grade 9-Ti-3Al-2.5VNear-α
Grade 12R53400Ti-0.3Mo-0.8NiNear-α
*The nominal composition are in mass fraction, %.
*α refers to single α-phase (hexagonal close-packed crystal structure).
*Near-α refers to the phase containing relatively small amount of β phase(body center cubic crystal structure)in an α matrix.
*α+β refers to compositions that support a mixture of α and β phases and may contain between 10% and 50% β phase at room temperature.

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