Hastelloys: The B, G, and C Families

Hastelloys are a family of nickel-based alloys renowned for their exceptional corrosion resistance, high-temperature strength, and excellent fabricability. They are widely used in various industries, including chemical processing, petrochemical, aerospace, and power generation. The B, G, and C families are specific groups within the Hastelloy alloys, each with its own unique characteristics and applications.

Hastelloys of the B Family.

The B family of Hastelloys is primarily known for its excellent resistance to oxidizing environments, particularly in the presence of chlorine and other halogens. They are often used in applications involving hydrochloric acid, chlorine, and chlorides.

1. Hastelloy B-2: An alloy widely used in the chemical processing industry, offering excellent resistance to hydrochloric acid, chlorine, and other oxidizing environments.
2. Hastelloy B-3: An alloy similar to B-2, providing exceptional resistance to oxidizing environments, but with improved resistance to reducing acids.

Hastelloys of the G Family

The G family of Hastelloys is characterized by its high-temperature strength and resistance to oxidation and carburization. They are commonly used in applications where high temperatures and corrosive environments are encountered.

1. Hastelloy G-30: An alloy known for its excellent resistance to oxidation and carburization at high temperatures, often used in components exposed to flue gases, furnace atmospheres, and other high-temperature environments.
2. Hastelloy G-35: An alloy similar to G-30, offering high-temperature strength and resistance to oxidation, but with improved resistance to reducing environments.

Hastelloys of the C Family.

The C family of Hastelloys is primarily designed for applications involving sulfur-containing environments. They are highly resistant to corrosion in the presence of sulfides, sulfates, and other sulfur-based compounds.

1. Hastelloy C-276: A versatile alloy for applications involving sulfuric acid, sulfurous acid, and other sulfur-containing environments, exhibiting excellent resistance to pitting and crevice corrosion.
2. Hastelloy C-4: An alloy similar to C-276, offering excellent resistance to sulfur-containing environments, but with improved resistance to reducing acids.