UNS R30188 Specification and Properties
# UNS R30188 Specification and Properties
## Introduction to UNS R30188
UNS R30188 is a high-performance nickel-based superalloy known for its exceptional strength and resistance to oxidation and corrosion at elevated temperatures. This alloy is widely used in aerospace, power generation, and industrial applications where materials must withstand extreme 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%
– Titanium (Ti): 1.8-2.4%
– Aluminum (Al): 1.4-1.8%
– Iron (Fe): ≤1.0%
– Carbon (C): ≤0.1%
– Boron (B): ≤0.01%
– Zirconium (Zr): ≤0.07%
## Mechanical Properties
UNS R30188 exhibits impressive mechanical properties across a wide temperature range:
Property | Value
Tensile Strength | 1,240 MPa (180 ksi)
Yield Strength | 825 MPa (120 ksi)
Elongation | 12%
Hardness | 36 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: 12.6 μm/m·K (20-100°C)
## Applications
UNS R30188 is commonly used in:
– Gas turbine engine components
– Aircraft structural parts
– Nuclear reactor components
– Chemical processing equipment
– High-temperature fasteners
## Fabrication and Heat Treatment
Proper fabrication techniques are essential for maintaining the properties of UNS R30188:
– Hot Working: Performed at 1,040-1,150°C (1,900-2,100°F)
– Cold Working: Possible but requires intermediate annealing
– Solution Annealing: 1,095-1,120°C (2,000-2,050°F) followed by rapid cooling
– Aging: 760-870°C (1,400-1,600°F) for 16 hours
## Corrosion Resistance
UNS R30188 offers excellent resistance to:
– Oxidation up to 1,100°C (2,012°F)
Keyword: uns r30188
– Sulfidation
– Carburization
– Chloride stress corrosion cracking
## Comparison with Similar Alloys
When compared to other nickel-based superalloys, UNS R30188 offers:
– Higher creep strength than Inconel 718
– Better oxidation resistance than Waspaloy
– Superior thermal fatigue resistance compared to Rene 41
## Standards and Specifications
UNS R30188 conforms to several industry standards:
– AMS 5666
– ASTM B637
– ISO 9725
– DIN 17752
## Conclusion
UNS R30188 represents a premium choice for applications demanding high strength and temperature resistance. Its balanced combination of mechanical properties, corrosion resistance, and fabricability makes it a versatile material for critical components in extreme environments. Engineers continue to specify this alloy for new applications where performance and reliability are paramount.