Grade 4 titanium is the strongest commercially pure (CP) grade: 550 MPa (80 ksi) minimum tensile strength and 483 MPa (70 ksi) minimum yield, with the highest iron and oxygen limits of the CP grades.
Chemical composition
Limits for Grade 4 Titanium (UNS R50700) in weight percent: maximums unless shown as a range. Source: ASTM B348 (bar), ASTM B265 (sheet/plate).
| Element | Limit (wt %) |
|---|---|
| Nitrogen (N) | 0.05 |
| Carbon (C) | 0.08 |
| Hydrogen (H) | 0.015 |
| Iron (Fe) | 0.50 |
| Oxygen (O) | 0.40 |
| Other elements | 0.1 each / 0.4 total |
| Titanium (Ti) | Balance |
Mechanical properties
Specified minimum properties for annealed Grade 4 Titanium at room temperature. Source: ASTM B348 (bar), ASTM B265 (sheet/plate). The values for your material are on its mill test certificate.
| Property | Value |
|---|---|
| Ultimate Tensile Strength (min) | 550 MPa (80 ksi) |
| Yield Strength (0.2%, min) | 483 MPa (70 ksi) |
| Elongation (min) | 15 % |
- Minimum properties per ASTM B348 apply to bar up to 3 in (76 mm); larger sections are by agreement.
- Minimum properties per ASTM B265 apply to plate up to 1 in (25 mm) thick; thicker plate is by agreement.
- Density is a typical value, not a specification requirement.
Grade 4 Titanium at a glance
| Supplied by Laube as | Bar, Sheet, Plate |
|---|---|
| ASTM standards | ASTM B348 (bar), ASTM B265 (sheet/plate) |
| Notes | Highest strength of the CP grades. Corrosion resistant. Lower formability than Grades 1–3. |
| Typical uses | Surgical implants, airframe components, cryogenic vessels |
| Compare | All grades chart |
| Industry pages | Medical & Orthopedic, Aerospace |
Frequently Asked Questions
Is Grade 4 the strongest commercially pure titanium?
Yes. Of the CP Grades 1–4, Grade 4 has the highest minimum tensile strength: 550 MPa (80 ksi) under ASTM B348 and B265.
