... , 6 % chromium, 4 % zirconium, 4 % molybdenum),18 Grade 20—Titanium alloy (3 % aluminum, 8 % vanadium, 6 % chromium, 4 % zirconium, 4 % ... molybdenum, 3 % aluminum, 2.7 % niobium, 0.25 % silicon),20 Grade 23—Titanium alloy (6 % aluminum, 4 % vanadium with extra low interstitial ... 0.5 % iron, 0.3 % silicon),33 Grade 36—Titanium alloy (45 % niobium),34 Grade 37—Titanium alloy (1.5 % aluminum), and35 Grade ...