Grade 2 vs Grade 4 Titanium Rod: Selection Guide
- Gr2 Titanium Rod
Grade 2 and Grade 4 are unalloyed titanium grades. Choosing a rod depends on the required mechanical properties, forming, service environment and applicable material specification. Grade 4 is generally considered when a higher specified strength is needed; Grade 2 may be considered where forming requirements are a priority.
Identify the grades and standard
Grade 2 is UNS R50400 and Grade 4 is UNS R50700. ASTM B348/B348M covers annealed titanium bars and billets including both grades. Specify the edition, diameter, tolerance, finish and condition. Obtain the agreed heat or lot certificate and compare chemical and mechanical test results against the actual contracted requirements.
Requirements vary with the specified edition and condition. Do not substitute a sheet or wire property’s acceptance values for a rod, or assume that every lot has identical performance.
Selection by application
| Decision | How to evaluate |
|---|---|
| Mechanical loading | Use the drawing, temperature, material condition and required design properties. |
| Forming and machining | Review rod geometry, bend or machining process, trial results and tolerances. |
| Corrosion | Compare performance for the exact medium, concentration, temperature and crevice conditions. |
| Welding | Qualify the procedure and assess the actual weld and heat-affected zone. |
| Traceability | Agree material certificate, tests and lot identification. |
Higher strength does not automatically mean a longer fatigue life or a higher permitted service temperature. Corrosion and hydrogen uptake depend on environmental conditions and fabrication. Avoid assuming a fixed corrosion-rate difference between grades.
Medical and pressure applications
If the rod is intended for medical device manufacture or a pressure component, identify the applicable material and product rules before ordering. Raw material conformance does not by itself approve a device, a welded joint or a pressure vessel.
For a broader buying framework, read the Grade 2 titanium rod selection guide.
Frequently asked questions
Is Grade 4 always the better choice?
No. Select the grade that meets the finished component’s strength, forming, corrosion and documentation requirements.
Can one temperature range be guaranteed for both grades?
No. The designer must assess the actual duty, material condition and applicable code.
Explore the titanium rod category or request a quotation with the grade, dimensions, condition and documentation requirements.
Published by: Titanium Valleys
Technical and quality review: The updated content is pending review.