Incoloy

 Incoloy is a family of nickel-chromium-based superalloys known for their excellent high-temperature strength and corrosion resistance. These alloys are composed primarily of nickel, with significant additions of chromium, iron, and other elements to enhance their properties.Incoloy alloys are commonly used in various industries, including aerospace, chemical processing, power generation, and marine applications. 

They are particularly suitable for environments with extreme temperatures, high pressures, and corrosive conditions.The most well-known members of the Incoloy alloy family are Incoloy 800, Incoloy 825, and Incoloy 800H/HT.

Well-known Incoloy Alloys

1. Incoloy 800: This alloy contains approximately 32% nickel, 21% chromium, and small amounts of aluminum and titanium. It offers excellent strength and resistance to oxidation, carburization, and sulfidation at elevated temperatures (up to 1100°C or 2000°F). Incoloy 800 is commonly used in heat exchangers, furnace components, and petrochemical processing equipment.

2. Incoloy 825: With a higher nickel content of around 42%, along with significant amounts of chromium, copper, and molybdenum, Incoloy 825 provides excellent resistance to various corrosive environments, including sulfuric acid, phosphoric acid, and seawater. It is often used in chemical processing units, marine equipment, and nuclear fuel reprocessing facilities.

3. Incoloy 800H/HT: These variants of Incoloy 800 have modified compositions to enhance their creep-rupture strength at higher temperatures. Incoloy 800H contains slightly higher carbon content, while Incoloy 800HT has increased levels of both carbon and aluminum. They are employed in applications such as ethylene pyrolysis furnaces, steam methane reformers, and nitric acid catalyst supports.Incoloy alloys offer good weldability, formability, and fabricability, making them versatile materials for various industrial applications. Their resistance to oxidation, corrosion, and high-temperature environments makes them valuable in challenging operating conditions.

4. Incoloy 925: This alloy is specifically designed for applications in the oil and gas industry, particularly in sour (hydrogen sulfide-containing) environments. It offers superior resistance to stress corrosion cracking and sulfide-induced cracking, making it suitable for downhole and surface equipment in oil and gas production.These are just a few examples of Incoloy alloys, and there are other grades available with different compositions and properties to suit specific applications. Incoloy alloys are known for their excellent performance in challenging environments and are trusted materials in industries where corrosion resistance and high-temperature strength are essential.