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# UNS R30188 Technical Specifications and Performance Review
## Introduction to UNS R30188
UNS R30188 is a high-performance alloy known for its exceptional strength and corrosion resistance in extreme environments. This nickel-based superalloy is widely used in aerospace, chemical processing, and power generation applications where materials must withstand high temperatures and aggressive conditions.
## Chemical Composition
The chemical composition of UNS R30188 plays a crucial role in its performance characteristics:
– Nickel (Ni): 58-63%
– Chromium (Cr): 19-23%
– Cobalt (Co): 13-16%
– Molybdenum (Mo): 4-6%
– Tungsten (W): 1-2%
– Aluminum (Al): 1.4-1.8%
– Titanium (Ti): 2.5-3.3%
– Carbon (C): 0.05-0.15%
– Boron (B): 0.003-0.010%
– Zirconium (Zr): 0.02-0.08%
## Mechanical Properties
UNS R30188 exhibits outstanding mechanical properties across a wide temperature range:
Property | Value
Tensile Strength | 1,240 MPa (180 ksi)
Yield Strength | 850 MPa (123 ksi)
Elongation | 15%
Hardness | 35 HRC
Density | 8.22 g/cm³
## Thermal Properties
The thermal characteristics of UNS R30188 make it suitable for high-temperature applications:
– Melting Point: 1,315-1,370°C (2,400-2,500°F)
– Thermal Conductivity: 11.4 W/m·K at 100°C
– Coefficient of Thermal Expansion: 12.8 μm/m·°C (20-100°C)
## Corrosion Resistance
UNS R30188 offers excellent resistance to various forms of corrosion:
– Oxidation resistance up to 1,100°C (2,012°F)
– Resistance to sulfidation and carburization
– Good performance in reducing and oxidizing atmospheres
– Resistance to stress corrosion cracking
## Applications
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The unique combination of properties makes UNS R30188 suitable for demanding applications:
– Gas turbine components (blades, vanes, combustors)
– Chemical processing equipment
– Nuclear reactor components
– Heat treatment fixtures
– Rocket engine components
## Fabrication and Welding
Working with UNS R30188 requires special considerations:
– Machining: Requires rigid setups and sharp tools
– Forming: Best performed at elevated temperatures
– Welding: Recommended methods include GTAW and EBW
– Heat Treatment: Solution annealing at 1,175-1,200°C followed by aging
## Comparison with Similar Alloys
When compared to other high-temperature alloys, UNS R30188 offers:
– Better creep resistance than Inconel 718
– Higher temperature capability than Hastelloy X
– Superior oxidation resistance compared to Waspaloy
– Better thermal fatigue resistance than Rene 41
## Conclusion
UNS R30188 represents a premium material solution for extreme environment applications. Its balanced combination of high-temperature strength, corrosion resistance, and fabricability makes it a preferred choice for critical components in aerospace and industrial applications. While more expensive than some alternatives, its performance justifies the cost in applications where reliability and longevity are paramount.
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