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.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | Grade 2 / UNS R50400 | R50400 | REF |
| 🇺🇸 | UNS | USA | R50400 | R50400 | REF |
| 🇪🇺 | EN | Europe | Ti Grade 2 / 3.7035 | 3.7035 | 100% |
| 🇨🇳 | GB | China | TA2 | — | 95% |
| 🇯🇵 | JIS | Japan | Class 2 (TP 340) | — | 95% |
| 🇩🇪 | DIN | Germany | Ti2 | 3.7035 | 95% |
| 🇷🇺 | GOST | Russia | VT1-0 | — | 90% |
Sources: ASTM B265, ASTM B348, DIN 17850, GB/T 3620, JIS H4600, GOST 19807
Chemical composition comparison (wt%)
Side-by-side: Titanium Grade 2 (CP) (ASTM) (ASTM B265) vs TA2 (GB)
| Element | Titanium Grade 2 (CP) (ASTM) | TA2 (GB) | Overlap |
|---|---|---|---|
| C | 0–0.08% | — | — |
| Ti | — | — | — |
| N | 0–0.03% | — | — |
| H | 0–0.015% | — | — |
| Fe | 0–0.3% | — | — |
| O | 0–0.25% | — | — |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 345 | MPa |
| Yield Strength | ≥ 275 | MPa |
| Elongation | ≥ 20 | % |
| Elastic Modulus | ≥ 105 | 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 |
| Melting Point | 1665 | °C |
| Elastic Modulus | 103 | GPa |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| annealing | 650–760 °C | air | 1-2 hours | Full anneal. Vacuum or inert gas atmosphere preferred. |
| stress_relief | 480–595 °C | air | 1-4 hours | After cold forming or welding |
Compatibility verdict
Titanium Grade 2 (CP) and TA2: 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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