1. Introduce
– A precipitation hardening cast superalloy, exhibiting excellent mechanical properties at high temperatures due to the precipitation of γ’ phase and carbides in the γ base
– Alloy developed to meet the demands of structural component applications in advanced aircraft engines
– Has an improved temperature range compared to Inconel 718
– Best combination of tensile, rupture, and weld properties compared to Waspaloy, Rene 41, and Rene 63
– PMET 820
– UNS N07220
* Rene
– Age-hardening Ni-Cr alloy with high strength, high temperature and corrosion resistance
* γ’ precipitates : A₃B type (LI₂) intermetallic compounds
– A : Electronegative elements such as Ni, Co, and Cu
– B : Electronegative elements such as Al, Ti, etc.
– Mo, Ti, Cr : Increased γ’ strength
* UNS
- Abbreviation of Unified Numbering Systems for Metals and Alloys
- Unified 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.
* N : Nickel and nickel alloys
* UNS N07220 : 07XXX : Chromium (Precipitation-hardenable alloy)
2. Property
– High temperature strength, oxidation resistance, creep resistance, thermal stability, excellent weldability
| Element | Impact |
|---|---|
| Ni | Provides excellent strength and corrosion resistance |
| Cr | Provides corrosion resistance, oxidation resistance |
| Ti | Provides high temperature strength, corrosion resistance |
| Co | Provides strength, creep properties |
| Mo | Provides high temperature creep properties |
| Ta | Creep resistance through solid solution strengthening, reduces stacking defect energy, provides heat resistance and corrosion resistance |
[Rene 220 Chemical Composition (%)]
| Ni | Cr | C | Ti |
|---|---|---|---|
| 51.46 ~ 59.08 | 18.00 ~ 22.00 | 0.02 ~ 0.04 | 0.90 ~ 1.10 |
| Mo | Co | Nb | Ta |
|---|---|---|---|
| 3.00 ~ 3.40 | 11.00 ~ 13.00 | 5.00 ~ 5.50 | 3.00 ~ 3.50 |
[Rene 220 Mechanical Properties]
| Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation (%) |
|---|---|---|
| 1105 | 830 | 6 |
[Rene 220 Physical Properties]
| Density (g/㎤) | Melting Range (℃) |
|---|---|
| 8.17 | 1232 ~ 1315 |
3. Standard & Specification
– Specification : UNS N07220
4. Available Form
– Bar, Rod
– Sheet, Plate
– Coil, Wire
– Pipe
– Powder
5. Application & Product
– Aerospace
| Application | Product |
|---|---|
| Aerospace | Turbine Blades, Turbine Wheels, Combustion Chamber Liners, Springs, Fasteners, Turbine Casings |
(1) Turbine Wheels / (2) Springs / (3) Turbine Casings / (4) Combustion Chamber Liners
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