Material Machinability SAE DIN WNR Ti-99.5 (Grade 1) 46% Grade 1 B381F4 Ti-99.5 Ti-99.6 (Grade 2) 40% Grade 2 B381F3 Ti-99.6 Ti-99.7 (Grade 3) 35% Grade 3 B381F2 Ti-99.7 Ti-99.8 (grade 4) 28% Grade 4 B381F1 Ti-99.8