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.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | ASTM Grade 4 / UNS R50700 | R50700 | REF |
| 🇪🇺 | EN | Europe | Ti-Cp4 / 3.7065 | 3.7065 | 100% |
Sources: ASTM B265, DIN 17850
Chemical composition comparison (wt%)
Side-by-side: Titanium Grade 4 (ASTM) (ASTM B265) vs Ti-Cp4 / 3.7065 (EN)
| Element | Titanium Grade 4 (ASTM) | Ti-Cp4 / 3.7065 (EN) | Overlap |
|---|---|---|---|
| C | 0–0.08% | — | — |
| Ti | ≥ 99% | — | — |
| N | 0–0.05% | — | — |
| Fe | 0–0.5% | — | — |
| O | 0–0.4% | — | — |
| H | 0–0.015% | — | — |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 550–655 | MPa |
| Yield Strength | ≥ 483 | MPa |
| Elongation | ≥ 15 | % |
| Elastic Modulus | ≥ 105 | GPa |
| Density | ≥ 4.51 | g/cm3 |
Compatibility verdict
Titanium Grade 4 and Ti-Cp4 / 3.7065: 100% 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.
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.
Ti-6Al-4V ELI (Grade 5 ELI)
3.7165Extra Low Interstitial version of Ti-6Al-4V — the standard titanium for surgical implants. Reduced O, N, C, Fe for improved ductility, fracture toughness, and biocompatibility. Used for hip and knee implants, bone screws, dental implants, spinal fusion devices, and cardiovascular stents. Also called Grade 23.
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