Titanium Grade 21S
UNS R58210
Description
Titanium Grade 21S is a metastable beta titanium alloy. Its composition is Ti-15Mo-2.7Nb-3Al-0.2Si, designed to improve corrosion resistance by molybdenum and niobium working together. The alloy provides high strength, good formability and weldability, excellent oxidation resistance and creep strength, and substantial strength to weight ratios. In addition, because it can be rolled to a foil, is compatible with most fibers, and is thermally stable to 816 °C, making it suitable for metal matrix compositions. Moreover, it can greatly resist aircraft hydraulic fluid, making it a good choice for the aerospace industry. Thus, Titanium Grade 21S was developed as an oxidation-resistant aerospace material and as a matrix for metal matrix composites.
Chemical Component
| Ti | Fe | O | C | N | H | Mo | Al | Nb | Si | Others |
|---|---|---|---|---|---|---|---|---|---|---|
| Balance | 0.400% max | 0.11-0.17% | 0.05% max | 0.050% max | 0.02% max | 14.0-16.0% | 2.5-3.5% | 2.4-3.2% | 0.15-0.25% | 0.10% max (each); 0.40% max (total) |
Basic Information
| Items | Titanium Grade 21S |
|---|---|
| Catalog | ACAM-Ti-A007 |
| Density | 0.178 lb/in3 (4.93 g/cm3) |
| Modulus of Elasticity | At 70 °F (20 °C): 15.2 x 103 ksi (105 GPa) |
| Modulus of Rigidity | At 70 °F (20 °C): 5.7 x 103 ksi (39.5 GPa) |
| Coefficient of Expansion | 3.93 µin/in.-°F (70 °F to 1000 °F); 7.07 µm/m-°C (20 °C to 538 °C) |
| Thermal Conductivity | 4.4 Btu-in./ft.hr.-°F (4.93 W/m-K) |
| Electrical Resistivity | 53 µΩ.in (1.35 µΩ.cm) |
Material Forms
Alfa Chemistry offers Titanium Grade 21S in the forms of Strip and Foil.
Typical Mechanical Properties
| Conditions | Heat Treatment | Tensile Strength | Suggested Operating Conditions |
|---|---|---|---|
| Annealed | Proprietary continuous furnace anneal | 115-140 ksi (793-965 MPa) | 0 °F to 1100 °F (-18 °C to 538 °C) |
| Annealed and Aged | 1000° F (538 °C) for 8 hours | 170 ksi min (1172 MPa min) | 0 °F to 1100 °F (-18 °C to 538 °C) |
Specifications
Strip and Foil: ASTM B 265
Applications
Titanium Grade 21S can be used in a variety of applications, including:
- Aircraft engine components
- Ductwork
- Airframes
- Structural honeycombs
- Fasteners
- Metal matrix composites
- Welded and seamless tubing
- Metal matrix composites
- Propellant tanks
* Technical data included herein should be used as a guideline only, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice.
You Want It? We Got It!
Alfa Chemistry is a manufacturer of standard & custom specialty metals & alloys. We stock a wide variety of alloys in different shapes and specifications. If you can't find the product or specification you need, please contact us directly.
Contact Us