Titanium Grade 4 is the strongest grade among commercially pure (CP) titanium grades. It achieves this through a higher oxygen content, which significantly increases strength while retaining excellent corrosion resistance.
Grade 4 is frequently selected when higher mechanical strength is required without moving to alloyed titanium grades such as Ti-6Al-4V.
Alloy Identification
| Standard | Designation |
|---|---|
| UNS | R50700 |
| ASTM | B265, B348, B381 |
| Alloy Type | Commercially Pure (Alpha Titanium) |
| Strength Level | Highest among CP Grades (1–4) |
Corrosion Resistance
Titanium Grade 4 exhibits corrosion resistance comparable to other CP grades and performs exceptionally well in aggressive environments.
✔ Seawater and marine atmospheres
✔ Chloride solutions
✔ Nitric acid and oxidizing chemicals
✔ Industrial and atmospheric pollutants
A stable TiO₂ passive oxide film forms naturally on the surface and self-heals when damaged, ensuring long-term durability.
Fabrication & Processing
✔ Excellent weldability (GTAW, GMAW, EBW)
✔ No post-weld heat treatment required
✔ Moderate machinability (harder than Grades 1–3)
✔ Requires sharp tooling and adequate cooling
✔ Good formability, though lower than Grades 1–2
Typical Applications
Medical & Biomedical
Dental implants, orthopedic screws & plates, surgical instruments
Marine & Offshore
Heat exchanger tubing, seawater piping, marine fasteners
Chemical & Industrial
Heat exchangers, condensers, pressure vessels, chemical processing equipment
Aerospace & Engineering
Non-critical aerospace structures, fasteners, hydraulic components
Limitations
⚠ Lower strength than alloyed titanium grades (Grade 5, Grade 23)
⚠ Reduced formability compared to Grades 1–2
⚠ Not suitable for very high-temperature structural service
Comparison – CP Titanium Grades
| Grade | Strength | Ductility | Typical Use |
|---|---|---|---|
| Grade 1 | Low | Excellent | Deep forming |
| Grade 2 | Medium | Very Good | General purpose |
| Grade 3 | High | Moderate | Structural CP |
| Grade 4 | Highest | Good | Medical, fasteners |
Why Choose Titanium CP Grade 4?
✔ Maximum strength among commercially pure titanium grades
✔ Outstanding corrosion resistance
✔ Excellent biocompatibility
✔ Reliable weldability and fabrication
✔ Cost-effective alternative to alloyed titanium
Titanium Grade 4 effectively bridges the gap between CP titanium and alloyed titanium grades, making it a preferred material for medical, marine, and high-strength corrosion-resistant applications.