ASTM B338-17(2026)

This specification covers 28 grades of seamless and welded titanium alloy tubes for surface condensers, evaporators, and heat exchangers.

Seamless tube shall be made from hollow billet by any cold reducing or cold drawing process that will yield a product meeting the requirements prescribed.

Welded tube shall be made from flat-rolled product by an automatic arc-welding process. The welded tube shall be sufficiently cold worked to final size in order to transform the cast weld microstructure into a typical equiaxed microstructure in the weld upon subsequent heat treatment.

The titanium shall conform to the chemical requirements prescribed.

The room temperature tensile properties of the tube in the condition normally supplied shall conform to the requirements prescribed.

Tubing shall withstand, without cracking, flattening under a load applied gradually at room temperature until the distance between the load platens is not more than the required height.

Welded tube shall be subjected to a reverse flattening test in accordance with supplement II of test methods and definitions A 370.

Testing requirements:

• Welded tubing shall be tested using both a non-destructive electromagnetic test and an ultrasonic test method.
• Seamless and welded/cold worked tubing shall be tested using an ultrasonic test method.
• Welded tubing shall be tested with a hydrostatic or pneumatic test method.
• Seamless tubing shall be tested with an electromagnetic or hydrostatic or pneumatic test method.

1.1 This specification covers the requirements for 28 grades of titanium and titanium alloy tubing intended for surface condensers, evaporators, and heat exchangers, 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 7— UNS R52400. Unalloyed titanium plus 0.12 % to 0.25 % palladium,
  • 1.1.4.1 Grade 7H— UNS R52400. Unalloyed titanium plus 0.12 % to 0.25 % palladium (Grade 7 with 58 ksi (400 MPa) minimum UTS),
• 1.1.5 Grade 9— UNS R56320. Titanium alloy (3 % aluminum, 2.5 % vanadium),
• 1.1.6 Grade 11— UNS R52250. Unalloyed titanium plus 0.12 % to 0.25 % palladium,
• 1.1.7 Grade 12— UNS R53400. Titanium alloy (0.3 % molybdenum, 0.8 % nickel),
• 1.1.8 Grade 13— UNS R53413. Titanium alloy (0.5 % nickel, 0.05 % ruthenium),
• 1.1.9 Grade 14— UNS R53414. Titanium alloy (0.5 % nickel, 0.05 % ruthenium),
• 1.1.10 Grade 15— UNS R53415. Titanium alloy (0.5 % nickel, 0.05 % ruthenium),
• 1.1.11 Grade 16— UNS R52402. Unalloyed titanium plus 0.04 % to 0.08 % palladium,
  • 1.1.11.1 Grade 16H— UNS R52402. Unalloyed titanium plus 0.04 % to 0.08 % palladium (Grade 16 with 58 ksi (400 MPa) minimum UTS),
• 1.1.12 Grade 17— UNS R52252. Unalloyed titanium plus 0.04 % to 0.08 % palladium,
• 1.1.13 Grade 18— UNS R56322. Titanium alloy (3 % aluminum, 2.5 % vanadium) plus 0.04 % to 0.08 % palladium,
• 1.1.14 Grade 26— UNS R52404. Unalloyed titanium plus 0.08 % to 0.14 % ruthenium,
  • 1.1.14.1 Grade 26H— UNS R52404. Unalloyed titanium plus 0.08 % to 0.14 % ruthenium (Grade 26 with 58 ksi (400 MPa) minimum UTS),
• 1.1.15 Grade 27— UNS R52254. Unalloyed titanium plus 0.08 % to 0.14 % ruthenium,
• 1.1.16 Grade 28— UNS R56323. Titanium alloy (3 % aluminum, 2.5 % vanadium) plus 0.08 % to 0.14 % ruthenium,
• 1.1.17 Grade 30— UNS R53530. Titanium alloy (0.3 % cobalt, 0.05 % palladium),
• 1.1.18 Grade 31— UNS R53532. Titanium alloy (0.3 % cobalt, 0.05 % palladium),
• 1.1.19 Grade 33— UNS R53442. Titanium alloy (0.4 % nickel, 0.015 % palladium, 0.025 % ruthenium, 0.15 % chromium),
• 1.1.20 Grade 34— UNS R53445. Titanium alloy (0.4 % nickel, 0.015 % palladium, 0.025 % ruthenium, 0.15 % chromium),
• 1.1.21 Grade 35— UNS R56340. Titanium alloy (4.5 % aluminum, 2 % molybdenum, 1.6 % vanadium, 0.5 % iron, 0.3 % silicon),
• 1.1.22 Grade 36— UNS R58450. Titanium alloy (45 % niobium),
• 1.1.23 Grade 37— UNS R52815. Titanium alloy (1.5 % aluminum),
• 1.1.24 Grade 38— UNS R54250. Titanium alloy (4 % aluminum, 2.5 % vanadium, 1.5 % iron), and
• 1.1.25 Grade 39— UNS R53390. Titanium alloy (0.25 % iron, 0.4 % silicon).

Note 1: H grade material is identical to the corresponding numeric grade (that is, Grade 2H = Grade 2) except for the higher guaranteed minimum UTS, and may always be certified as meeting the requirements of its corresponding numeric grade. Grades 2H, 7H, 16H, and 26H are intended primarily for pressure vessel use.

1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.