UNS R30188 Specification and Properties

UNS R30188 is a high-performance nickel-based alloy known for its exceptional resistance to oxidation, corrosion, and high-temperature environments. This alloy is widely used in aerospace, chemical processing, and power generation industries due to its unique combination of mechanical strength and durability. In this article, we will explore the key specifications, properties, and applications of UNS R30188.

Chemical Composition of UNS R30188

The chemical composition of UNS R30188 plays a crucial role in its performance. Below is a breakdown of its primary elements:

Nickel (Ni): 58-63%

Chromium (Cr): 20-23%

Iron (Fe): ≤5%

Cobalt (Co): ≤1%

Molybdenum (Mo): 8-10%

Tungsten (W): 0.2-1%

Aluminum (Al): ≤0.5%

Titanium (Ti): ≤0.6%

Carbon (C): ≤0.1%

This composition ensures excellent resistance to sulfidation, carburization, and other forms of high-temperature degradation.

Mechanical Properties

UNS R30188 exhibits outstanding mechanical properties, making it suitable for demanding applications. Some of its key mechanical characteristics include:

Tensile Strength: 120-150 ksi (827-1034 MPa)

Yield Strength: 80-100 ksi (552-689 MPa)

Elongation: 20-30%

Hardness: 200-250 HB

These properties make UNS R30188 ideal for components exposed to extreme stress and temperature fluctuations.

Thermal Properties

The thermal properties of UNS R30188 contribute to its performance in high-temperature environments:

Melting Point: 2350-2400°F (1290-1315°C)

Thermal Conductivity: 6.5-7.5 BTU/hr·ft·°F (11.2-13 W/m·K)

Thermal Expansion Coefficient: 7.5-8.5 µin/in·°F (13.5-15.3 µm/m·K)

These characteristics ensure stability and reliability in applications such as gas turbines and heat exchangers.

Applications of UNS R30188

Due to its superior properties, UNS R30188 is used in various industries, including:

Aerospace: Turbine blades, combustion chambers, and exhaust systems

Chemical Processing: Reactors, valves, and piping systems

Power Generation: Gas turbines, boilers,