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UNS R30188 Material Specifications and Applications

UNS R30188, also known as Haynes 188, is a cobalt-based superalloy renowned for its exceptional high-temperature strength, oxidation resistance, and thermal stability. This alloy is widely used in aerospace, industrial gas turbines, and other demanding applications where extreme conditions are prevalent. In this article, we will delve into the material specifications, properties, and key applications of UNS R30188.

Material Specifications of UNS R30188

UNS R30188 is a wrought cobalt-nickel-chromium-tungsten alloy that exhibits outstanding performance in high-temperature environments. Below are the key specifications of this material:

• Chemical Composition: The alloy primarily consists of cobalt (Co), nickel (Ni), chromium (Cr), and tungsten (W), with trace amounts of other elements like iron (Fe), manganese (Mn), and silicon (Si).
• Density: Approximately 9.13 g/cm³.
• Melting Range: 1290-1350°C (2354-2462°F).
• Tensile Strength: Up to 965 MPa (140 ksi) at room temperature.
• Yield Strength: Around 485 MPa (70 ksi) at room temperature.
• Elongation: Typically 40% in 50 mm (2 inches).

Key Properties of UNS R30188

UNS R30188 is prized for its unique combination of mechanical and chemical properties, making it suitable for extreme environments. Some of its notable properties include:

High-Temperature Strength

The alloy retains its mechanical strength at temperatures up to 980°C (1800°F), making it ideal for components exposed to prolonged thermal stress.

Oxidation and Corrosion Resistance

UNS R30188 exhibits excellent resistance to oxidation and corrosion, even in sulfur-rich environments. This is due to the formation of a protective chromium oxide layer on its surface.

Thermal Stability

The alloy maintains its structural integrity under cyclic thermal conditions, making it suitable for applications involving repeated heating and cooling cycles.

Weldability and Fabrication

UNS R30188 can be welded using conventional techniques, though post-weld heat treatment is often recommended to restore its properties. It is also amenable to machining and forming processes.

Applications of UNS R30188

Thanks to its exceptional properties, UNS R30188 is employed in a variety of high-performance applications. Below are some of the most common uses:

Aerospace Industry

The alloy is widely used in aircraft engine components, such as turbine blades, combustion chambers, and afterburner parts, where high-temperature strength and oxidation resistance are critical.

Industrial Gas Turbines

UNS R30188 is a preferred material for gas turbine components, including vanes, seals, and combustor liners, due to its ability to withstand extreme thermal and mechanical stresses.

Chemical Processing

In chemical plants, the alloy is used for equipment exposed to aggressive environments, such as reactors, heat exchangers, and piping systems.

Power Generation

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