Difference Types of Hastelloy Bars

Hastelloy bar

Hastelloy alloys exhibit outstanding resistance to corrosion, high strength, and extreme-temperature capabilities, making them of particular interest for applications in demanding industries like chemical processing, aerospace, and power generation. The bars are used in various applications with requirements for resistance to stress corrosion cracking, pitting, and general corrosion. Among the various types of Hastelloy bars, Hastelloy B2 bars and Hastelloy C22 bars are two of the most popular alloys. Understanding the differences between these two materials can help businesses make informed decisions about which Hastelloy bar best suits their needs.

What is Hastelloy?

Hastelloy is the trademarked name for a series of corrosion-resistant metal alloys that are essentially composed of nickel, chromium, and molybdenum. These alloys are corrosion-resistant in severe environments, acidic, and high-temperature. Hastelloy is utilized in applications like chemical reactors, heat exchangers, and turbines where materials face corrosive elements or extreme conditions.

Hastelloy B2 Bar

The Hastelloy B2 bar provides excellent resistance to hydrochloric acid and other reducing agents. They have a high molybdenum content, and the product is applied in environments where it is exposed to acidic solutions such as hydrochloric acid. The alloy also offers an exceptional level of resistance to stress corrosion cracking, and it can be used in critical applications where structural integrity matters.

Important Features of Hastelloy B2 Bar:

Corrosion Resistance: The high molybdenum content in Hastelloy B2 bars provides excellent resistance to corrosion, particularly in reducing environments, such as hydrochloric acid. This makes it suitable for use in chemical reactors and piping systems handling highly corrosive substances.

Temperature Stability: Hastelloy B2 maintains its strength and resistance to corrosion at elevated temperatures, making it ideal for high-temperature applications. It can withstand temperatures up to 1,200°F (650°C) without significant degradation.

Mechanical Properties: Hastelloy B2 bars have high strength and ductility. These bars are easy to form and weld, making them suitable for manufacturing various components such as pipes, flanges, and valves.

Applications: Hastelloy B2 bars are often used in industries dealing with aggressive chemical processes, such as pharmaceuticals, petrochemicals, and food processing.

Hastelloy C22 Bar

Hastelloy C22 bars are another alloy in popular demand that offers resistance in a wide variety of corrosive environments. Compared with Hastelloy B2, this alloy has higher chromium and tungsten contents, which enhance the alloy’s resistance to oxidizing conditions and chloride-induced stress corrosion cracking.

Key Characteristics of Hastelloy C22 Bar

Corrosion Resistance: Bars of Hastelloy C22 resist a high rate of corrosive chemicals, which include sulfuric acid, nitric acid, and others. With some resistance to pitting crevices in chlorides or those environments with aggressive and reducing acids, this alloy is ideal for making use of chlorine or highly oxidizing acids.

Temperature Resistance: Hastelloy C22 bars remain as resistant to high temperatures as Hastelloy B2 but are versatile and have a better degree of protection in oxidizing or reducing environments. They thus gain wider applications in chemical and marine environments that will expose corrosive agents to various agents.

Mechanical Properties: Hastelloy C22 bars have excellent weldability and formability. It can be shaped intricately for complicated shapes without sacrificing its corrosion resistance and is, therefore, the favourite of industries that require custom-made parts.

Applications: Hastelloy C22 bars are widely used in chemical processing, aerospace, and marine environments where the materials are exposed to chlorine, acids, and other corrosive agents. It is commonly used in manufacturing components such as heat exchangers, pressure vessels, and reactor linings.

Key differences between Hastelloy B2 bars and Hastelloy C22 bars

While both Hastelloy B2 and Hastelloy C22 have superior corrosion resistance, their properties make them suitable for different applications. Here are the key differences between these two types of Hastelloy bars:

Corrosion Resistance:

Hastelloy B2 bars are optimized for use in reducing environments, especially those involving hydrochloric acid.

Hastelloy C22 bars are resistant to both reducing and oxidizing environments, thus being more versatile in handling a wider range of corrosive agents, including chlorides.

Composition:

Hastelloy B2 contains a higher percentage of molybdenum, which is very good for resistance to hydrochloric acid.

Hastelloy C22 contains higher percentages of chromium and tungsten, which enhance its resistance to oxidation and other aggressive environments, such as sulfuric and nitric acids.

Applications:

Hastelloy B2 bars are normally used in industries where the material is exposed to highly corrosive, reducing environments.

Hastelloy C22 bars are more commonly used in industries dealing with a wide variety of corrosive chemicals, particularly where both oxidizing and reducing environments are encountered.

Temperature Resistance:

Both Hastelloy B2 and Hastelloy C22 offer excellent high-temperature resistance, but Hastelloy C22 is generally better at handling extreme conditions involving both oxidation and reduction.

Conclusion

The choice of Hastelloy bar depends on the kind of environmental conditions and chemical processes to which the material is exposed. Hastelloy B2 bars are suited for applications involving hydrochloric acid and reducing agents, while Hastelloy C22 bars offer broader protection in both oxidizing and reducing environments, which makes them suitable for a wider range of applications. Both alloys offer high strength and corrosion resistance, thus ensuring that your equipment is very durable and reliable in even the most aggressive environments. Once you understand the differences, you can choose the best Hastelloy bar for your needs, with long-lasting performance and protection against corrosion in critical applications.