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| Grade | Code | UNS | Titanium |
| Titanium Grade 21 | TiGr21 | R58210 |
TiGr21, is a metastable beta titanium alloy that combines high strength with relatively low density. In the solution-treated condition, it offers good formability, while subsequent aging can significantly increase its mechanical strength. The alloy is distinguished by its ability to retain strength and structural stability at elevated temperatures, together with good creep and oxidation resistance. Its beta structure provides favorable cold-forming capability compared with many high-strength titanium alloys. Its high specific strength and thermal stability make it advantageous where both weight reduction and demanding mechanical performance are required.
| Ti % | Mo % | Nb % | Al % | Si % | Fe % | O % | C % | N % | H % | * % | ** % |
| Bal. | 14.00–16.00 | 2.40–3.20 | 2.50–3.50 | 0.15–0.25 | ≤0.40 | 0.11–0.17 | ≤0.05 | ≤0.05 | ≤0.015 | ≤0.10 | ≤0.40 |
* Other, each
** Other, total
| Product Form | Rp0.2 [MPa]* | Rm [MPa]* | Elongation [%]* | Density [g/cm³] |
| Bar | ≥759 | ≥793 | ≥15 | 4.93 |
| Plate | ||||
| Sheet |
* Solution Treated
| Product Form | Rp0.2 [MPa]* | Rm [MPa]* | Elongation [%]* | Density [g/cm³] |
| Round Bar | 1104–1276 | ≥1172 | ≥8 | 4.93 |
| Plate | Per order requirements | Per order requirements | Per order requirements | |
| Sheet** | ≥1103 | ≥1172 | ≥4 |
* Solution Treated + Aged (STA)
** Minimum values for the condition: 843°C solution treatment + air cooling + aging at 538°C / 8 h.
| Sector / Application Area | Typical Products and Components |
| Aerospace – Engine and Exhaust Systems | Engine exhaust plugs, nozzle assemblies, high-temperature engine structural components |
| Aerospace – Airframe Structural Systems | Warm airframe structures, honeycomb panels, high-strength fasteners |
| Aerospace – Tubing and Fluid Systems | Welded tubes, seamless tubes, tubing and structural fluid-system components for aircraft hydraulic systems |
| Advanced Composites / Space Technologies | Titanium matrix composites (MMC), fiber-reinforced metal-matrix laminates, thin titanium-foil-based composite structures |
TiGr21, is particularly suited to elevated-temperature applications in the approximate range of 228°C to 593°C and offers good weldability characteristic of beta titanium alloys. Machining is preferably carried out after aging because the heavily cold-worked surface layer produced during machining may respond differently during subsequent aging. Prolonged exposure of solution-treated material in the 260–427°C range should be controlled to minimize the risk of embrittlement. In addition, when processing above the beta transus temperature of approximately 807°C, time at temperature should be kept as short as practical to limit excessive grain growth.
TiGr21, Titanium Grade 21, Beta 21S, TIMETAL® 21S, UNS R58210, Ti-15Mo-3Nb-3Al-0.2Si
| Product Form | ASTM | AMS |
| Round Bar | ASTM B348/B348M – Grade 21 | — |
| Plate | ASTM B265 – Grade 21 | — |
| Sheet | ASTM B265 – Grade 21 | AMS 4897F |
TIMET – Titanium Metals Corporation (USA) – Ti Grade 21
Note: The information contained in this datasheet is for informational purposes only; no liability is accepted.
