Hastelloy Alloys

Hastelloy Alloys 

Hastelloy is a trademarked name for a family of corrosion-resistant metal alloys primarily composed of nickel, with other elements such as molybdenum, chromium, and iron. These alloys are designed for high-performance applications where resistance to corrosion, oxidation, and high-temperature stability is essential.

Key Types of Hastelloy Alloys and Their Common Uses

Hastelloy C-276

◆ Composition: Primarily nickel, with molybdenum and chromium as key elements.
◆ Properties: Excellent resistance to a wide variety of aggressive chemical environments, especially in the presence of chlorine, sulfuric acid, and hydrochloric acid. It is highly resistant to stress corrosion cracking.
◆ Applications: Chemical processing, power plants, pollution control equipment, and pharmaceutical manufacturing.

Hastelloy C-22

◆ Composition: Similar to C-276 but with a slightly different balance of alloying elements, including more chromium.
◆ Properties: Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, especially in highly aggressive environments like hydrochloric acid, sulfuric acid, and other chlorides.
◆ Applications: Chemical and petrochemical processing, marine environments, flue gas desulfurization.

Hastelloy B-2

◆ Composition: Primarily nickel with high levels of molybdenum.
◆ Properties: Outstanding resistance to hydrochloric acid and other reducing environments.
◆ Applications: Ideal for applications where exposure to hydrochloric acid in reducing conditions is expected.

Hastelloy X

◆ Composition: A nickel-based alloy with significant amounts of iron and chromium.
◆ Properties: Excellent high-temperature strength, oxidation resistance, and weldability. It can maintain its structural integrity at temperatures as high as 2,000°F (1,093°C).
◆ Applications: Aerospace and gas turbine applications, combustion chambers, and exhaust systems.

Hastelloy C-4

◆ Composition: Nickel, molybdenum, and chromium, with small amounts of iron and tungsten.
◆ Properties: Excellent resistance to both oxidizing and reducing environments, particularly in acid-rich environments.
◆ Applications: Applications involving sulfuric acid, phosphoric acid, and other aggressive chemicals.

General Applications of Hastelloy Alloys

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Chemical Processing

Due to their exceptional corrosion resistance, Hastelloy alloys are used in reactors, heat exchangers, and piping systems that handle aggressive chemicals.

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Aerospace

Hastelloy X, for example, is used in jet engines, gas turbines, and other components that need to withstand high temperatures and oxidation.

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Marine

The alloys are often used in saltwater environments where resistance to corrosion is crucial.

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Pharmaceutical

Used in equipment for the production of drugs and in environments requiring sterile conditions due to their resistance to corrosion and contamination.