Of all the alpha-beta titanium alloys, Titanium 6AL-4V (Grade 5) is the most widely used. This alloy was originally developed for light-weight and high strength applications in the aerospace market.
| % | C | N | O | H | Fe | Ti | Al | V |
|---|---|---|---|---|---|---|---|---|
| Min | - | - | - | - | - | Balance | 5.5 | 3.5 |
| Max | 0.08 | 0.05 | 0.2 | 0.125 | 0.4 | Balance | 6.75 | 4.5 |
Ti 6Al-4V (Grade 5) is the most widely used of all the alpha-beta titanium alloys.The alloy was originally developed for the aerospace market and widely used in aerospace structural components. More recently the alloy has seen extensive use in the oil & gas market where a combination of high strength, corrosion resistance and low weight is essential.
The density of Ti 6Al-4V (Grade 5) is 50% that of nickel-based alloys and stainless steels. It is therefore used extensively in various applications due to its high strength-to-weight ratio.
It is typically used in the annealed condition, at service temperatures up to 400°C. However it may be heat treated for high strength in sections under 4″ thick.
Ti 6Al-4V (Grade 5) can be welded with matching or ELI filler wire.
| Mechanical & Physical Properties | 21°C | 93°C | 204°C | 316°C |
|---|---|---|---|---|
| Coefficient of Thermal Expansion µm/m⁰C | 9.54 | 9.72 | 9.9 | |
| Thermal Conductivity /kcal/(hr.m.°C) | 5.95 | 6.4 | 7.74 | 9.08 |
| Modulus of Elasticity / x105 MPa | 1.15 | 1.1 | 1.03 | 9.65 |
| 0.2% Yield Strength, ksi | Fracture Toughness K1C, ksi √in | |
|---|---|---|
| Annealed (continuously rolled sheet) | 132, 142 (transversea) | 128, 140 (transversea) |
| Beta annealed | 131 | 134 |
| Beta STA 677°C | 128 | 150 |
| Beta STA 538°C | 143 | 120 |
| STA 677°C | 137 | 105 |
| STA 538°C | 159 | 80 |
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