1.1 This specification covers the requirements for 26 grades of titanium and titanium alloy welded pipe intended for general corrosion resisting and elevated temperature service as follows:

1.1.1 Grade 1—Unalloyed titanium, low oxygen,

1.1.2 Grade 2—Unalloyed titanium, standard oxygen,

1.1.3 Grade 3—Unalloyed titanium, medium oxygen,

1.1.4 Grade 5—Titanium alloy (6 % aluminum, 4 % vanadium),

1.1.5 Grade 7—Unalloyed titanium plus 0.12 % to 0.25 % palladium, standard oxygen,

1.1.6 Grade 9—Titanium alloy (3 % aluminum, 2.5 % vanadium),

1.1.7 Grade 11—Unalloyed titanium plus 0.12 % to 0.25 % palladium, low oxygen,

1.1.8 Grade 12—Titanium alloy (0.3 % molybdenum, 0.8 % nickel),

1.1.9 Grade 13—Titanium alloy (0.5 % nickel, 0.05 % ruthenium), low oxygen,

1.1.10 Grade 14—Titanium alloy (0.5 % nickel, 0.05 % ruthenium), standard oxygen,

1.1.11Grade 15—Titanium alloy (0.5 % nickel, 0.05 % ruthenium), medium oxygen,

1.1.12 Grade 16—Unalloyed titanium plus 0.04 % to 0.08 % palladium, standard oxygen,

1.1.13 Grade 17—Unalloyed titanium plus 0.04 % to 0.08 % palladium, low oxygen,

1.1.14 Grade 18—Titanium alloy (3 % aluminum, 2.5 % vanadium plus 0.04 % to 0.08 % palladium),

1.1.15 Grade 19—Titanium alloy (3 % aluminum, 8 % vanadium, 6 % chromium, 4 % zirconium, 4 % molybdenum),

1.1.16 Grade 20—Titanium alloy (3 % aluminum, 8 % vanadium, 6 % chromium, 4 % zirconium, 4 % molybdenum) plus 0.04 % to 0.08 % palladium,

1.1.17 Grade 21—Titanium alloy (15 % molybdenum, 3 % aluminum, 2.7 % niobium, 0.25 % silicon),

1.1.18 Grade 23—Titanium alloy (6 % aluminum, 4 % vanadium, extra low interstitial, ELI),

1.1.19 Grade 24—Titanium alloy (6 % aluminum, 4 % vanadium) plus 0.04 % to 0.08 % palladium,

1.1.20 Grade 25—Titanium alloy (6 % aluminum, 4 % vanadium) plus 0.3 % to 0.8 % nickel and 0.04 % to 0.08 % palladium,

1.1.21 Grade 26—Unalloyed titanium plus 0.08 % to 0.14 % ruthenium,

1.1.22 Grade 27—Unalloyed titanium plus 0.08 % to 0.14 % ruthenium,

1.1.23 Grade 28—Titanium alloy (3 % aluminum, 2.5 % vanadium) plus 0.08 % to 0.14 % ruthenium,

1.1.24 Grade 29—Titanium alloy (6 % aluminum, 4 % vanadium with extra low interstitial elements (ELI)) plus 0.08 % to 0.14 % ruthenium,

1.1.25 Grade 33—Titanium alloy (0.4% nickel, 0.015% palladium, 0.025% ruthenium, 0.15% chromium), and

1.1.26 Grade 34—Titanium alloy (0.4% nickel, 0.015% palladium, 0.025% ruthenium, 0.15% chromium).

1.1.27 Grade 35—Titanium alloy (4.5 % aluminum, 2 % molybdenum, 1.6 % vanadium, 0.5 % iron, 0.3 % silicon).

1.2 The values stated in inch-pund units are to be regarded as the standard. The values given in parentheses are for information only.