ASTM · ASTM B338 / ASME SB338
Titanium Tubes according to ASTM B338 / ASME SB 338: Specifications and Alloy Grades
Technical requirements of the ASTM B338 standard
The ASTM B338 specification regulates the manufacture of seamless and welded tubes made of titanium and its alloys, optimized for operation in heat exchange equipment, surface condensers, and evaporators. EV Group China supplies metal products that fully comply with these engineering standards.
| Grade | UNS Number | Alloy Description |
|---|---|---|
| Grade 1 | R50250 | Unalloyed titanium |
| Grade 2 | R50400 | Unalloyed titanium |
| Grade 2H | R50400 | Unalloyed titanium (min. UTS 400 MPa) |
| Grade 3 | R50550 | Unalloyed titanium |
| Grade 4 | R50700 | Unalloyed titanium |
| Grade 5 | R56400 | Ti-6Al-4V |
| Grade 6 | R54520 | Ti-5Al-2.5Sn |
| Grade 7 | R52400 | Ti-Pd (0.12–0.25%) |
| Grade 7H | R52400 | Ti-Pd (0.12–0.25%, min. UTS 400 MPa) |
| Grade 9 | R56320 | Ti-3Al-2.5V |
| Grade 11 | R52250 | Ti-Pd (0.12–0.25%) |
| Grade 12 | R53400 | Ti-0.3Mo-0.8Ni |
| Grade 13 | R53413 | Ti-0.5Ni-0.05Ru |
| Grade 14 | R53414 | Ti-0.5Ni-0.05Ru |
| Grade 15 | R53415 | Ti-0.5Ni-0.05Ru |
| Grade 16 | R52402 | Ti-Pd (0.04–0.08%) |
| Grade 16H | R52402 | Ti-Pd (0.04–0.08%, min. UTS 400 MPa) |
| Grade 17 | R52252 | Ti-Pd (0.04–0.08%) |
| Grade 18 | R56322 | Ti-3Al-2.5V + Pd |
| Grade 19 | R58640 | Ti-3Al-8V-6Cr-4Zr-4Mo |
| Grade 20 | R58645 | Ti-3Al-8V-6Cr-4Zr-4Mo + Pd |
| Grade 21 | R58210 | Ti-15Mo-3Al-2.7Nb-0.25Si |
| Grade 23 | R56407 | Ti-6Al-4V ELI |
| Grade 24 | R56405 | Ti-6Al-4V + Pd |
| Grade 25 | R56403 | Ti-6Al-4V-Ni-Pd |
| Grade 26 | R52404 | Ti-Ru (0.08–0.14%) |
| Grade 26H | R52404 | Ti-Ru (0.08–0.14%, min. UTS 400 MPa) |
| Grade 27 | R52254 | Ti-Ru (0.08–0.14%) |
| Grade 28 | R56323 | Ti-3Al-2.5V + Ru |
| Grade 29 | R56404 | Ti-6Al-4V ELI + Ru |
| Grade 30 | R53530 | Ti-0.3Co-0.05Pd |
| Grade 31 | R53532 | Ti-0.3Co-0.05Pd |
| Grade 32 | R55111 | Ti-5Al-1Sn-1Zr-1V-0.8Mo |
| Grade 33 | R53442 | Ti-0.4Ni-0.015Pd-0.025Ru-0.15Cr |
| Grade 34 | R53445 | Ti-0.4Ni-0.015Pd-0.025Ru-0.15Cr |
| Grade 35 | R56340 | Ti-4.5Al-2Mo-1.6V-0.5Fe-0.3Si |
| Grade 36 | R58450 | Ti-45Nb |
| Grade 37 | R52815 | Ti-1.5Al |
| Grade 38 | R54250 | Ti-4Al-2.5V-1.5Fe |
| Grade 39 | R53390 | Ti-0.25Fe-0.4Si |
The technical requirements of ASTM B338 are based on the inch-pound system; SI values are provided for information purposes. Grades with the “H” suffix are characterized by increased ultimate tensile strength (UTS) and are certified for use in pressure vessels.
The specification was developed by ASTM Committee B10. For the design of steam boilers and equipment operating under excess pressure, the provisions of ASME (Section II, specification SB338) must be followed.