1. Introduce
– Ti 811 : Ti alloy with additions of 8% Al, 1% Mo, 1% V
– Alloys primarily designed for creep resistance up to 430 degrees
– Near alpha alloy with excellent creep resistance
– Tensile strength at room temperature is similar to Ti-6Al-4V; tensile strength and creep properties at 425 degrees C are superior to other alpha and alpha+beta titanium alloys
– UNS R54810
* Near ɑ alloy
- Features
– Excellent mechanical strength, fracture toughness, and creep resistance
– Maintains high temperatures up to 600 degrees
– Small amount of ductile beta phase present in near alpha alloys - Types
– Ti-5Al-2.5Sn
– Ti-8Al-1Mo-1V
– Ti-6Al-2Sn-4Zr-2Mo
– Ti-6Al-2Sn-4Zr-2Mo-0.1Si
– Ti-5.5Al-3.5Sn-3Zr-1Nb
* UNS
- Abbreviation for Unified Numbering Systems for Metals and Alloys
- Unified unique numbering system for metals and alloys
- A representative number that is compatible with metals and alloys defined in many material-related codes such as ASTM, AISI, ASME, AWS, etc.
* R : Reactive and Refractory Metals and Alloys
* UNS R54810 : 5XXXX : Titanium
2. Property
– Creep resistance, fatigue strength, good weldability
| Element | Impact |
|---|---|
| Al | Grain refinement element, provides high temperature oxidation resistance |
| Mo | Provides corrosion resistance, pitting and crevice corrosion resistance, high temperature strength, creep rupture strength, and toughness |
| V | Provides high temperature strength |
[Ti 811 Chemical Composition (%)]
| Ti | N | C | H | Fe |
|---|---|---|---|---|
| 88.18 ~ 91.15 | Max. 0.05 | Max. 0.08 | Max. 0.02 | Max. 0.30 |
| O | Al | V | Mo | Others |
|---|---|---|---|---|
| Max. 0.12 | 7.35 ~ 8.35 | 0.75 ~ 1.25 | 0.75 ~ 1.25 | Max. 0.40 |
[Ti 811 Mechanical Properties]
| Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation (%) | Hardness HV typical |
|---|---|---|---|
| 900 ~ 1000 | 830 ~ 951 | 10 | 341 |
[Ti 811 Physical Properties]
| Density (g/㎤) | Melting Range (℃) | Beta transus temperature (℃) | Specific Heat (0-100℃), J/kg*℃ |
|---|---|---|---|
| 4.37 | Max. 1540 | 1040 ± 17 | 502 |
3. Standard & Specification
– Specification : UNS R54810
| SAE | AMS 4933, 4955, 4973 |
| MIL | F-8383142, T-81556 |
| Product Form | SAE | MIL |
|---|---|---|
| Sheet, Strip, Plate | AMS 4915, 4916 | T-9046 |
| Bar, Wire, Rings | AMS 4972 | T-9047 |
4. Available Form
– Bar, Rod
– Sheet, Plate, Strip
– Coil, Wire
– Forgings
5. Application & Product
– Aerospace, Chemical, Medical
| Application | Product |
|---|---|
| Aerospace | Brackets, Fittings, Compressor cases, Disks, Aircraft engines, Compressor blades |
| Chemical | Reactors, Tanks, Piping systems |
| Medical | Implants, Surgical tools |
(1) Brackets / (2) Aircraft engines / (3) Tanks / (4) Surgical tools
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