A titanium-aluminium-tin-zirconium-molybdenum alloy, Titanium 6-2-4-2 is primarily used for applications requiring high strength and toughness.
Excellent resistance to fatigue and crack propagation, Ti 6-2-4-2 has outstanding resistance to corrosion in a wide range of media.
| % | Al | Sn | Zr | Mo | C | N | H | O | Si | Fe | Y | Others, each | Others, total | Ti |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | 5.5 | 1.8 | 3.6 | 1.8 | - | - | - | - | 0.06 | - | - | - | - | - |
| Max | 6.5 | 2.2 | 4.4 | 2.2 | 0.05 | 0.05 | 0.015 | 0.12 | 0.1 | 0.25 | 0.005 | 0.1 | 0.3 | Balance |
A near-alpha alloy, primarily used due to its high strength and toughness, Ti 6-2-4-2 has good creep resistance up to 550°C.
The forging and machining characteristics of Ti 6-2-4-2 are similar to those of Ti 6Al-4V.
The weldability of Ti 6-2-4-2 is fair, using AMS 4952 weld wire. Several different treatments are available.
Sheet & Strip under 0.1875″ thickness: Duplex anneal: 899°C, 30 minutes, air cool, followed by 787°C 15 minutes, air cool. Triplex anneal: 899°C 30 minutes, air cool, followed by 787°C 15 minutes air cool, 593°C 2 hours air cool.
Plate 0.1875 inch thickness and over: Duplex anneal: 343°C 60 minutes, air cool, followed by 593°C 8 hours air cool. Triplex anneal: 899°C 30 minutes, air cool, followed by 787°C, 15 minutes air cool, 593°C 2 hours air cool.
Bar and Forgings: Duplex anneal: Solution anneal 25 – 50°C below. Beta transus 1 hour, air cool or faster, 593°C 8 hours air cool.
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| Thickness, in | 0.025 ≤ 0.062 | > 0.062 ≤ 1.000 | > 1.000 ≤ 3.000 |
|---|---|---|---|
| Tensile Strength, ksi | 135,000 | 135,000 | 135,000 |
| 0.2% offset Yield Strength, ksi | 125,000 | 125,000 | 125,000 |
| Elongation, % | 8 | 10 | 10 |
| Nominal Thickness, in | ≤ 0.070 | > 0.070 < 0.1875 |
|---|---|---|
| Factor, 105° Bend | 9 | 10 |
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