Ti-4al-4mo-2sn
| Common Name | |
|---|---|
| Ti–4Al–4Mo–2Sn | |
| Ti-550 | |
| UNS | |
| None assigned | |
| General Information | |
| Ti 550 is a high strength, forgeable alpha beta alloy. In the solution treated and aged condition it has superior tensile and fatigue properties compared to Ti 6-4 combined with good elevated temperature tensile and creep properties up to 750°F (400°C). This alloy has applications in the aerospace industry both as aero engine (eg compressor discs) and airframe components (eg flap tracks). Ti 550 has also found applications in high performance automotive engines. The alloy may be welded using electron beam or laser welding techniques. In sheet form, the alloy has good superplastic forming properties and an excellent balance of strength and toughness. | |
| Common Specification | |
| Specification | Product Form |
| MSRR | Bar |
| MSRR 8663/8634 | Discs, rotating components |
| TA 45/46 | Rod/bar |
| TA 47 | Forging stock |
| Chemistry Requirements | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | O+2 | H | Fe | Al | Mo | Sn | Si | Ti |
| 0.05 | 0.27 | 0.0125 | 0.2 | 3.0-5.0 | 3.0-5.0 | 1.5-2.5 | 0.3-0.7 | Balance |
% Maximum unless given as a range.
| Minimum Tensile Properties | ||||
|---|---|---|---|---|
| Condition | UTS ksi (Mpa) | >0.2%YS ksi (MPA) | % El. | % RA* |
| Bar/Rod <1 in (25mm) | 160 (1100) | 139 (960) | 9 | 20 |
| Bar/Rod/Forgings 1-4 in (25-100mm) | 152 (1050) | 133 (920) | 9 | 20 |
| Bar/Rod/Forgings 4-6 in (100-150 mm) | 145 (1000) | 126 (870) | 9 | 20 |
| Plate 0.2-2.5 in (5-65 mm) | 149 (1030) | 130 (900) | 9 | 20 |
| Typical Tensile Properties | ||||
|---|---|---|---|---|
| Condition | UTS ksi (Mpa) | >0.2%YS ksi (MPA) | % El. | % RA* |
| 1 in (25mm) rod ST | 157 (1080) | 135 (930) | 12 | 40 |
| 1 in (25mm) rod ST+A | 174 (1200) | 155 (1070) | 14 | 42 |
Note: Typical properties are not to be utilized as a requirement, but are only listed for guidance. These properties may or may not be attainable in all circumstances.
* %Ra not required by all specifications
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