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 18212;Unalloyed titanium, low oxygen,
1.1.2 Grade 28212;Unalloyed titanium, standard oxygen,
1.1.3 Grade 38212;Unalloyed titanium, medium oxygen,
1.1.4 Grade 58212;Titanium alloy (6 % aluminum, 4 % vanadium),
1.1.5 Grade 78212;Unalloyed titanium plus 0.12 % to 0.25 % palladium, standard oxygen,
1.1.6 Grade 98212;Titanium alloy (3 % aluminum, 2.5 % vanadium),
1.1.7 Grade 118212;Unalloyed titanium plus 0.12 % to 0.25 % palladium, low oxygen,
1.1.8 Grade 128212;Titanium alloy (0.3 % molybdenum, 0.8 % nickel),
1.1.9 Grade 138212;Titanium alloy (0.5 % nickel, 0.05 % ruthenium), low oxygen,
1.1.10 Grade 148212;Titanium alloy (0.5 % nickel, 0.05 % ruthenium), standard oxygen,
1.1.11Grade 158212;Titanium alloy (0.5 % nickel, 0.05 % ruthenium), medium oxygen,
1.1.12 Grade 168212;Unalloyed titanium plus 0.04 % to 0.08 % palladium, standard oxygen,
1.1.13 Grade 178212;Unalloyed titanium plus 0.04 % to 0.08 % palladium, low oxygen,
1.1.14Grade 188212;Titanium alloy (3 % aluminum, 2.5 % vanadium plus 0.04 % to 0.08 % palladium),
1.1.15 Grade 198212;Titanium alloy (3 % aluminum, 8 % vanadium, 6 % chromium, 4 % zirconium, 4 % molybdenum),
1.1.16 Grade 208212;Titanium alloy (3 % aluminum, 8 % vanadium, 6 % chromium, 4 % zirconium, 4 % molybdenum) plus 0.04 % to 0.08 % palladium,
1.1.17 Grade 218212;Titanium alloy (15 % molybdenum, 3 % aluminum, 2.7 % niobium, 0.25 % silicon),
1.1.18 Grade 238212;Titanium alloy (6 % aluminum, 4 % vanadium, extra low interstitial, ELI),
1.1.19 Grade 248212;Titanium alloy (6 % aluminum, 4 % vanadium) plus 0.04 % to 0.08 % palladium,
1.1.20 Grade 258212;Titanium alloy (6 % aluminum, 4 % vanadium) plus 0.3 % to 0.8 % nickel and 0.04 % to 0.08 % palladium,
1.1.21 Grade 268212;Unalloyed titanium plus 0.08 % to 0.14 % ruthenium,
1.1.22 Grade 278212;Unalloyed titanium plus 0.08 % to 0.14 % ruthenium,
1.1.23 Grade 288212;Titanium alloy (3 % aluminum, 2.5 % vanadium) plus 0.08 % to 0.14 % ruthenium,
1.1.24 Grade 298212;Titanium alloy (6 % aluminum, 4 % vanadium with extra low interstitial elements (ELI)) plus 0.08 % to 0.14 % ruthenium,
1.1.25 Grade 338212;Titanium alloy (0.4% nickel, 0.015% palladium, 0.025% ruthenium, 0.15% chromium), and
1.1.26 Grade 348212;Titanium alloy (0.4% nickel, 0.015% palladium, 0.025% ruthenium, 0.15% chromium).
1.2 Pipe 8 in. NPS (nominal pipe size) and larger is most frequently custom made for an order. In such cases, the purchaser carefully should consider the applicability of this specification. Since the pipe is custom made, the purchaser may choose a wall thickness other than those in to meet specific operating conditions. The purchaser may also be better served to specify only the portions of this specification that are required to meet the operating conditions (for example, annealing, flattening test, chemistry, properties, etc.)
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are for information only.
1.4 Optional supplementary requirements are provided for pipe where a greater degree of testing is desired. These supplementary requirements may be invoked by the purchaser, when desired, by specifying in the order.
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