1.1 This specification covers the requirements for 34 grades of titanium and titanium alloy seamless pipe intended for general corrosion resisting and elevated temperature service as follows: 1.1.1 Grade 1—UNS R50250. Unalloyed titanium, 1.1.2 Grade 2—UNS R50400. Unalloyed titanium, 1.1.2.1 Grade 2H—UNS R50400. Unalloyed titanium (Grade 2 with 58 ksi (400 MPa) minimum UTS), 1.1.3 Grade 3—UNS R50550. Unalloyed titanium, 1.1.4 Grade 5—UNS R56400. Titanium alloy (6?% aluminum, 4?% vanadium), 1.1.5 Grade 7—UNS R52400. Unalloyed titanium plus 0.12 to 0.25?% palladium, 1.1.5.1 Grade 7H—UNS R52400. Unalloyed titanium plus 0.12 to 0.25?% palladium (Grade 7 with 58 ksi (400 MPa) minimum UTS), 1.1.6 Grade 9ȁ