Grades 1, 2, 3 and 4 are commercially pure titanium. Grade 2 is a commonly used specification across all product forms. Grade 1 is specified when superior formability is required. Grades 3 and 4 are used where higher levels of strength are necessary.
Grades 7, 11 and 12 are alloys possessing superior corrosion resistance in particular to reducing acid chlorides. The mechanical properties of grades 7 and 11 are identical to those of Grades 2 and 1 respectively. Grade 12 is stronger and retains useful levels of strength up to 300oC.
Grades 5 and 9 are alloys with good corrosion resistance and medium levels of strength. They are frequently limited in use to specific products.