Ti Grade 7
3.7235Palladium-enhanced commercially pure titanium — the most corrosion-resistant Ti grade. Same mechanical properties as Grade 2, but with 0.12-0.25% Pd for dramatically improved resistance to reducing acids (HCl, H2SO4) and crevice corrosion. Premium price justified only where extreme chemical resistance is needed. Used for chemical processing equipment, desalination plants, and chlor-alkali cells.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | ASTM Grade 7 / UNS R52400 | R52400 | REF |
| 🇺🇸 | UNS | USA | R52400 | R52400 | REF |
| 🇪🇺 | EN | Europe | Ti-0.2Pd / 3.7235 | 3.7235 | 100% |
| 🇩🇪 | DIN | Germany | TiPd | 3.7235 | 95% |
Sources: ASTM B265, ASTM B348, EN 10204, DIN 17851
Chemical composition comparison (wt%)
Side-by-side: Ti Grade 7 (ASTM) (ASTM B265) vs TiPd (DIN)
| Element | Ti Grade 7 (ASTM) | TiPd (DIN) | Overlap |
|---|---|---|---|
| C | 0–0.08% | — | — |
| Ti | — | — | — |
| N | 0–0.03% | — | — |
| Pd | 0.12–0.25% | — | — |
| Fe | 0–0.3% | — | — |
| O | 0–0.25% | — | — |
| H | 0–0.015% | — | — |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 345 | MPa |
| Yield Strength | ≥ 275 | MPa |
| Elongation | ≥ 20 | % |
| Elastic Modulus | ≥ 103 | GPa |
| Density | ≥ 4.51 | g/cm3 |
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 345–485 | MPa |
| Yield Strength Rp0.2 | ≥ 275 | MPa |
| Elongation A | ≥ 20 | % |
General
| Property | Value | Unit |
|---|---|---|
| Density | 4.51 | g/cm³ |
Compatibility verdict
Ti Grade 7 and TiPd: 95% composition match
Close equivalents but NOT identical.
Related materials
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.
Titanium Grade 4
3.7065The strongest commercially pure titanium grade. Highest oxygen content (0.40% max) for maximum strength among CP grades. UTS min 550 MPa — approaches some Ti alloys. Used for airframe skins, marine hardware, surgical implants, and chemical plant components requiring higher strength than Grade 2.
Ti Grade 9 / Ti-3Al-2.5V
3.7195Medium-strength alpha-beta titanium alloy — the standard for seamless tubing. 50% stronger than CP Grade 2 with better cold formability than Ti-6Al-4V. The go-to alloy for hydraulic tubing in aerospace and bicycle frames. Used for aircraft hydraulic lines, offshore risers, and sporting goods.
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