Titanium Grade 4 is the highest-strength of the four principal commercially pure titanium grades.
It offers greater tensile and yield strength than Grades 1, 2 and 3 while retaining the corrosion resistance, low density and weldability characteristic of commercially pure titanium.
Grade 4 is designated UNS R50700.
Grade 4 Chemical Composition
| Element | Weight % |
|---|---|
| Titanium (Ti) | Balance |
| Oxygen (O) | ≤ 0.40 |
| Iron (Fe) | ≤ 0.50 |
| Carbon (C) | ≤ 0.08 |
| Nitrogen (N) | ≤ 0.05 |
| Hydrogen (H) | ≤ 0.015 |
Grade 4 Mechanical Properties
Representative minimum annealed properties include:
| Property | Value |
|---|---|
| Ultimate tensile strength | ≥ 550 MPa |
| 0.2% yield strength | ≥ 483 MPa |
| Elongation | ≥ 15% |
| Density | approximately 4.51 g/cm³ |
Characteristics
Grade 4 is selected when the corrosion resistance of commercially pure titanium is required together with substantially greater mechanical strength.
Its higher oxygen content increases strength but reduces formability compared with Grades 1 and 2. It can nevertheless be fabricated and welded successfully using appropriate titanium-processing procedures.
Typical Applications
- Chemical-processing equipment
- Pressure-containing equipment
- Heat exchangers
- Marine components
- Industrial structures
- Aerospace components
- Medical and dental components
- Applications requiring the highest strength available from standard commercially pure titanium
Common Specifications
- ASTM B265
- ASTM B348
- ASTM F67
- ASME SB-265
- AMS 4901 for applicable sheet, strip and plate products
Technical Note
Chemical and mechanical properties shown are representative of commonly referenced specifications. Requirements can vary by product form, thickness, heat treatment and governing standard. Material should be ordered to the required specification, and the supplied material test report (MTR) should be used to verify compliance.
