Titanium grades — Grade 2, 5, 7 and 12
Titanium forms a stable oxide film that makes it practically immune to seawater, chlorides, wet chlorine and many oxidising acids. It is about 45 % lighter than steel for similar strength, which matters offshore and in heat-exchanger service.
What titanium is
Commercially pure Grade 2 is the workhorse for piping. Grade 7 (with 0.15 % palladium) and Grade 12 (with molybdenum and nickel) resist crevice corrosion in hot brines and reducing acids. Grade 5 (Ti-6Al-4V) is a high-strength alloy for forgings, fasteners and risers.
- Commercially pure grades: titanium with controlled oxygen and iron
- Grade 7: 0.12–0.25 % palladium
- Grade 12: 0.3 % molybdenum, 0.8 % nickel
- Grade 5: 6 % aluminium, 4 % vanadium
Key properties
| Density | 4.51 g/cm³ (about 57 % of steel) |
|---|---|
| Grade 2 yield, min | 275 MPa |
| Grade 5 yield, min | 828 MPa |
| Seawater corrosion | Practically immune, including crevices up to about 80 °C (Grade 2) |
| Forms | B381 forgings, B363 fittings, B861 / B862 pipe, B265 plate |
Titanium grades compared
Chemistry and minimum room-temperature properties from the governing ASTM / ASME / API specifications. Open any grade for its full data sheet and PDF.
| Grade | Form | UNS | Cr% | Ni% | Mo% | C% | YieldMPa min | TensileMPa min |
|---|---|---|---|---|---|---|---|---|
| Titanium Grade 2 (UNS R50400) | Titanium forgings, fittings & pipe | R50400 | — | — | — | 0.08 max | 275 | 345 |
| Titanium Grade 5 (Ti-6Al-4V) | Titanium forgings & bar | R56400 | — | — | — | 0.08 max | 828 | 895 |
| Titanium Grade 7 (UNS R52400) | Titanium forgings, fittings & pipe | R52400 | — | — | — | 0.08 max | 275 | 345 |
| Titanium Grade 12 (UNS R53400) | Titanium forgings, fittings & pipe | R53400 | — | 0.6–0.9 | 0.2–0.4 | 0.08 max | 345 | 483 |
Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.
Specifications by product form
| Product form | Grades |
|---|---|
| Titanium forgings, fittings & pipe | Titanium Grade 2 (UNS R50400), Titanium Grade 7 (UNS R52400), Titanium Grade 12 (UNS R53400) |
| Titanium forgings & bar | Titanium Grade 5 (Ti-6Al-4V) |
Where titanium is used
- Seawater cooling and desalination
- Chlor-alkali, chlorine dioxide and bleach plants
- Offshore firewater and risers
- Heat exchangers and condensers
- Pharmaceutical and fine chemicals
Welding and fabrication
Titanium must be welded with full inert-gas shielding (trailing and back purge) — any discolouration beyond light straw indicates contamination. Keep it free of iron pick-up during fabrication. Galvanic contact with less noble metals in seawater needs insulation.
FAQ
Titanium: common questions
What is the difference between Grade 2 and Grade 5 titanium?
Grade 2 is commercially pure titanium (yield 275 MPa) with the best formability and corrosion resistance. Grade 5 is Ti-6Al-4V, an alloy with about three times the strength (yield 828 MPa), used for highly stressed parts.
Which ASTM specification covers titanium flanges?
ASTM B381 covers titanium forgings, including flanges (e.g. B381 F-2). Butt-weld fittings are ASTM B363 WPT2.
Is titanium good for seawater?
Yes — it is one of the most seawater-resistant engineering metals and is widely used in desalination and offshore cooling.
Titanium products from Teshi Group
Titanium Flanges & Fittings — Grade 1, 2, 5, 7 & 12
Grades, sizes and standards we supply
ViewMaterial productsTitanium Grade 1 / 2 / 5 / 7 / 12 Flanges
Grades, sizes and standards we supply
ViewMaterial productsTitanium Grade 2 / 5 / 7 Pipe Fittings
Grades, sizes and standards we supply
ViewOEM manufacturerIndustrial Flanges
ViewOEM manufacturerButt Weld Fittings
ViewStockist & supplierIndustrial Pipes
ViewOther material families
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