Grade 4 Titanium
Commercially pure (CP) titanium
Typical values for the temper in the title
Grade 4 is the strongest commercially pure titanium: more oxygen and iron than Grade 2, and a minimum tensile strength of about 550 MPa. It still keeps the corrosion resistance of pure titanium.
It is used for parts that need higher strength without alloying, in aerospace, the chemical industry and dental implants.
Mechanical and physical properties
| Property | Value | Note |
|---|---|---|
| Tensile strength Rm | 550 MPa | minimum |
| Yield strength Rp0.2 | 480 MPa | database value; minimum 483 |
| Elongation A | 15% | |
| Hardness | 265 HB | |
| Modulus of elasticity E | 104 GPa | |
| Density ρ | 4.51 g/cm³ | |
| Machinability | 30% | relative rating in the site database |
Chemical composition (wt %)
| Element | Range | Role |
|---|---|---|
| O oxygen | max 0.40 | the element that sets strength in pure titanium |
| Fe iron | max 0.50 | |
| N nitrogen | max 0.05 | |
| C carbon | max 0.08 | |
| H hydrogen | max 0.015 | limited: causes embrittlement |
| Ti titanium | balance |
Ranges per ASTM B265 (strip, sheet and plate).
Conditions and heat treatment
Commercially pure titanium is not strengthened by heat treatment. Strength is set by oxygen and iron content, and by cold work.
| Condition | Properties | When to choose it |
|---|---|---|
| Annealed | Rm min 550 MPa, yield min 483 MPa, elongation min 15% | the normal delivery condition per ASTM B265 |
Applications
- Dental implants
- Aerospace parts
- High-strength chemical equipment
- Bolts and machined parts
- Marine parts
Fabrication
Machining
Titanium conducts heat poorly, so heat stays at the tool edge. Use low cutting speed, adequate feed (do not "rub"), sharp tools and plenty of coolant. Fine chips can ignite.
Welding
Welds well by TIG, but only with full inert-gas shielding, including a trailing shield and backing gas. Oxygen and nitrogen from the air embrittle the weld. Weld color (silver, not blue or grey) indicates shielding quality.
Threads and contact
Titanium tends to gall in sliding contact. Use anti-seize compound on threads.
Compared with similar materials
| Material | Rm / Rp0.2 | Welding | When it is the better choice |
|---|---|---|---|
| Grade 2 | 340–440 / 275–375 MPa | Excellent — ERTi-2 | softer, more common · material page |
| Ti-6Al-4V (Grade 5) | 950–1100 / 880 MPa | Good — ERTi-5 | an alloy, much stronger · material page |
| Ti-3Al-2.5V (Grade 9) | 620–690 / 485–550 MPa | Excellent | a medium-strength alloy · material page |
Common mistakes
Assuming pure titanium is "weak"
Strength is lower than the alloys, but good for its weight, and corrosion resistance is excellent.
Welding without full gas shielding
The weld becomes brittle. Its color indicates shielding quality.
Expecting Grade 2 formability
The higher oxygen reduces ductility. Forming is harder.
Equivalents, standards and supply
| EN | 3.7065 |
|---|---|
| Standards | ASTM B265 Gr4 / AMS 4901 |
| Forms | plate · pipe · rod |
| Producers | TIMET · VSMPO · Kobe Steel |
Learn more
Values are typical and for comparison only. For design, rely on the standard and the mill certificate. Sources: ASTM B265 (sheet and plate), ASTM F136, AMS specifications, producer data sheets, and the METAL HUB materials database.
Updated: October 31, 2026