Cobalt Nickel 188 Sheet Exporters

By Author: Bhavesh Sanghvi
Total Articles: 20
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Alloy 188, also known by brand names such as Nickel Alloy 188, Haynes® 188, and Udimet 188®, is a high-performance cobalt-nickel-chromium-tungsten superalloy. Its composition includes a high level of chromium and small amounts of lanthanum, providing exceptional toughness and corrosion resistance. This alloy is widely used in applications requiring excellent high-temperature strength and resistance to oxidation and sulfidation.

Key Properties
High-Temperature Strength: Retains excellent strength at temperatures up to 2000°F (1095°C).
Oxidation Resistance: Provides outstanding resistance to oxidation in high-temperature environments.
Sulfidation Resistance: Offers good resistance to sulfidation, protecting against sulfur-containing environments.
Corrosion Resistance: High chromium content enhances resistance to corrosion.
Fabricability: Easily fabricated using conventional techniques, including both cold and hot working.
Ductility and Stability: Exhibits excellent ductility and metallurgical stability, facilitating various manufacturing processes.
Chemical Composition
The ...
... chemical composition of Alloy 188 includes:

Cobalt (Co): Balance
Nickel (Ni): 20-24%
Chromium (Cr): 21-23%
Tungsten (W): 13-15%
Manganese (Mn): 1.25% max
Iron (Fe): 3% max
Carbon (C): 0.05-0.15%
Silicon (Si): 0.20-0.50%
Lanthanum (La): 0.02-0.12%
Specifications
UNS R30188
Rod, Bar, Wire, and Forging Stock: AMS 5772
Plate, Sheet, and Strip: AMS 5608
Welding Wire: AMS 5801
Applications
Alloy 188 is extensively used in high-temperature and corrosive environments, particularly in the aerospace and gas turbine industries. Typical applications include:

Combustion Cans
Flame Holders
Liners
Transition Ducts
Afterburner Parts
Spray Bars
Fabrication and Heat Treatment
Fabrication: Alloy 188 can be easily cold and hot worked. It exhibits excellent ductility, making it suitable for various forming operations. Due to its work-hardening nature, frequent intermediate annealing may be required during complex forming processes.
Heat Treatment: Typically solution heat treated at 1163-1191°C, followed by rapid cooling or water quenching to achieve optimal properties. Lower temperature annealing can cause carbide precipitation, which may affect material properties.

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