Ti Grade 11
CP Titanium Grade 11 — Ti-0.12-0.25% Pd. Same mechanical properties as Grade 1 (lowest strength CP) but with dramatically improved crevice corrosion resistance in reducing acid environments due to Pd addition. Used for chemical process equipment, heat exchangers, and vessels handling HCl, H2SO4, and other reducing acids where unalloyed CP-Ti would corrode.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | ASTM Grade 11 / UNS R52250 | R52250 | REF |
Sources: ASTM B265
Chemical composition comparison (wt%)
Side-by-side: Ti Grade 11 (ASTM B265) vs ASTM (ASTM B265)
| Element | Ti Grade 11 (ASTM B265) | ASTM | Overlap |
|---|---|---|---|
| C | — | 0–0.08% | — |
| Ti | — | — | — |
Mechanical properties
Related materials
Ti-6Al-4V (Grade 5)
3.7164The most widely used titanium alloy — accounts for ~50% of all titanium production. Alpha-beta alloy with exceptional strength-to-weight ratio. Used for jet engine components, airframe structures, medical implants (hip/knee), fasteners, and racing components. Biocompatible.
Titanium Grade 2 (CP)
3.7035The workhorse commercially pure titanium grade. Best balance of strength, ductility, and corrosion resistance among CP grades. Excellent resistance to seawater, chlorides, and oxidizing acids. Used for heat exchangers, chemical processing, marine hardware, desalination, and medical implants.
Titanium Grade 1
3.7025The softest and most ductile commercially pure titanium grade. Lowest O content (0.18% max) for maximum formability. Used for plate heat exchangers, chemical plant vessels, explosive cladding, deep-drawn parts, and anodizing applications. Lower strength than Grade 2 but superior formability.
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