Alloy 6-4, Grade 5 (Ti 6AL-4V), commonly called "6-4," is the most common and widely used titanium alloy grade due to its relatively low cost and good availability. Ti 6Al-4V is considered the 'workhorse' of the titanium industry, accounting for over 50% of total titanium usage. It has a UTS of 130,000 psi [895 MPa] minimum, good weldability, and can be heat treated to a higher strength or toughness. Grade 5 is used in aircraft components such as landing gear, wing spars, and compressor blades. Its corrosion resistance is generally comparable to Grade 2 and it is often used in corrosion service where higher strength is required. Typical applications in rocket motor cases, shafts, ordinance equipment, high strength bolting, pressure vessels, keys, airframe and turbine engine parts (spacer rings, blades, wheels, discs).
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Other 6AL-4V Specifications:
| AWS A5.16 ERTi-5 | Ti 6Al-4V | ER Ti-6Al-4V | Ti 6-4 |
| UNS R56400 | ASTM/ASME Grade 5 | Alloy 318 | Mil-T-9046-AB1/AB2 |
| MSRR 8632 | MSRR 9500/73 | BS 2TA10 | OMAT 3/145A |
| Nominal Chemical Composition (%) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Al | V | Fe | O | C | N | H | Y | OE | OT | Ti |
| 5.50 - 6.75 | 3.50 - 4.50 | 0.22 max | 0.12 - 0.18 | 0.05 max | 0.030 max | 0.015 max | 0.005 max | 0.50 max | 0.20 max | BAL |
Ti 6Al-4V may be considered in any application where a combination of high strength at low to moderate temperatures, light weight and excellent corrosion resistance are required. Some of the many applications where this alloy has been used include aircraft turbine engine components, aircraft structural components, aerospace fasteners, high-performance automotive parts, marine applications, medical devices, and sports equipment.
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