1. Introduce
– Co-Cr-W alloy
– Excellent ductility even after prolonged exposure at temperatures of 650, 760 and 870°C for 16,000 hours
– High temperature strength and oxidation resistance at temperatures up to about 1095°C
– Can be forged or otherwise hot worked if held at 1175°C for sufficient time
– Haynes 188, Udimet 188, Alloy 188, Conicro 4023
– UNS R30188
* Udimet : a cobalt-based alloy with wear and corrosion resistant properties
* 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 R30031 : 3XXXX : Cobalt
2. Property
– High temperature strength, abrasion resistance, weldability, creep and oxidation resistance, ductility, cold workability, good chloride and sulfide resistance
| Element | Impact |
|---|---|
| Co | Provides high temperature creep strength, abrasion resistance |
| Cr | Provides corrosion resistance, strength |
| W | Provides high temperature hardness, abrasion resistance |
[HS 188 Chemical Composition (%)]
| Co | Cr | Ni | Fe |
|---|---|---|---|
| Min. 37.02 | Max. 22.00 | Max. 22.00 | Max. 3.00 |
| C | Si | Mn | W |
|---|---|---|---|
| Max. 0.15 | Max. 0.50 | Max. 1.25 | Max. 14.00 |
| P | S | La | |
|---|---|---|---|
| Max. 0.02 | Max. 0.02 | Max. 0.04 |
[HS 188 Mechanical Properties]
| Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation (%) |
|---|---|---|
| Min. 862 | Min. 379 | Min. 45 |
[HS 188 Physical Properties]
| Density (g/㎤) | Melting Range (℃) | Specific Heat (0-100℃), J/kg*℃ |
|---|---|---|
| 8.98 | 1330 | 403 |
3. Standard & Specification
– Specification : UNS R30188
| Product Form | SAE | GE | PWA |
|---|---|---|---|
| Strip | AMS 5608 | B50A712 | 1042 |
| Plate | AMS 5608 | – | 1042 |
| Bar, Rings, Forgings | AMS 5772 | B50TF74 | – |
| Wire | AMS 5801 | – | – |
4. Available Form
– Strip
– Plate, Sheet
– Bar, Rod, Rings, Forgings
– Wire
5. Application & Product
– Aerospace
| Application | Product |
|---|---|
| Aerospace | Combustors, Flame Holders, Liners, Transition Ducts |
(1) Combustors / (2) Flame Holders / (3) Transition Ducts
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