Ti Grade 3
Commercially pure titanium Grade 3 — highest oxygen (0.35% max) of the CP grades = highest strength (UTS 450-550 MPa). Between Grade 2 (general purpose) and Grade 4 (maximum CP strength). Used for chemical process equipment, marine hardware, and structural components where higher strength than Grade 2 is needed but alloy cost (Ti-6Al-4V) is not justified.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | ASTM Grade 3 / UNS R50550 | R50550 | REF |
Sources: ASTM B265
Chemical composition comparison (wt%)
Side-by-side: Ti Grade 3 (ASTM) (ASTM B265) vs ASTM (ASTM B265)
| Element | Ti Grade 3 (ASTM) | ASTM | Overlap |
|---|---|---|---|
| C | 0–0.08% | 0–0.08% | OK |
| Ti | — | — | — |
| N | 0–0.05% | 0–0.05% | OK |
| O | 0–0.35% | 0–0.35% | OK |
| Fe | 0–0.3% | 0–0.3% | OK |
| H | 0–0.015% | 0–0.015% | OK |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 450–550 | MPa |
| Yield Strength | ≥ 380 | MPa |
| Elongation | ≥ 18 | % |
| Elastic Modulus | ≥ 103 | GPa |
| Density | ≥ 4.51 | g/cm3 |
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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