HAYNES 188
HAYNES 188 is a nickel-chromium-cobalt-based superalloy designed for excellent oxidation and corrosion resistance at high temperatures. It is commonly used in aerospace and industrial applications where high performance is critical.
Composition
- Carbon (C): Min 0.05%, Max 0.15%
- Manganese (Mn): Max 1.25%
- Phosphorus (P): Max 0.02%
- Sulfur (S): Max 0.02%
- Silicon (Si): Min 0.20%, Max 0.50%
- Chromium (Cr): Min 20.0%, Max 24.0%
- Nickel (Ni): Min 20.0%, Max 24.0%
- Cobalt (Co): Min 39%
- Boron (B): Max 0.015%
- Iron (Fe): Max 3.00%
- Tungsten (W): Min 13.0%, Max 16.0%
- Lanthanum (La): Min 0.03%, Min 0.12%
Properties
- Density: Approximately 8.6 g/cm³.
- Thermal Conductivity: ~13 W/m·K.
- Tensile Strength: Excellent tensile strength at high temperatures.
- Oxidation Resistance: Superior resistance to oxidation and carburization.
Applications
- HAYNES 188 is extensively used in aerospace applications for components such as turbine blades, exhaust systems, and other parts where high-temperature strength and oxidation resistance are crucial.
Advantages
- Excellent High-Temperature Strength: Maintains mechanical properties at elevated temperatures.
- Superior Oxidation Resistance: Performs well in oxidizing environments.
Limitations
- Cost: High cost due to the alloy's composition.
- Machinability: Can be difficult to machine due to its hardness.