The Different Grades of Titanium

Commercially Pure Grades

There are four grades of commercially pure titanium. Pure titanium ranges from grade 1, which has the highest corrosion resistance, formability, and lowest strength, to grade 4, which offers the highest strength and moderate formability.

Grade 1 is the first of four commercially pure titanium grades. It is the softest and most ductile, with the greatest formability, excellent corrosion resistance, and high impact toughness, but it is the weakest of the four grades. Grade 1 is the material of choice for any application where ease of formability is required. It is most commonly used in chemical processing, architecture, automotive parts, and aeronautic structures.

Grade 2 is commercially pure titanium and provides lightweight and corrosion resistance. It is slightly stronger than grade 1 and is used frequently in areas that require welding because of its strong weldability properties. It has good strength, ductility, and formability. Grade 2 bar and sheet are the prime choice for many fields including the medical industry and the marine industry.

Grade 3 finds its home primarily in aerospace and industrial applications since they require moderate strength, excellent corrosion resistance, and good weldability. It is stronger than grade 1 and grade 2 but less malleable. This grade is the least used of the commercially pure titanium grades, applied in marine, medical, aerospace, and chemical processing.

Grade 4 is recognized as the strongest of the four commercially pure titanium grades, with excellent corrosion resistance, good formability, and weldability. It is used in airframe components, heat exchangers, CPI equipment, and condenser tubing, and has recently found a niche as a medical-grade titanium.

Titanium Alloys

Grade 5 (Ti-6Al-4V) is the most popular alloy: titanium alloyed with 6 percent aluminum and 4 percent vanadium. The resultant alloy increases strength, heat resistance, and corrosion resistance. It offers high strength at light weight, useful formability, and high corrosion resistance. Grade 5 is the most used titanium worldwide and the most used alloy in oilfields.

Frequently Asked Questions

How many commercially pure titanium grades are there? Four: grades 1 through 4.

Which CP grade is strongest? Grade 4.

Which grade is most used worldwide? Grade 5 (Ti-6Al-4V), the most popular titanium alloy.