Hastelloy B vs. Hastelloy C
What's the Difference?
Hastelloy B and Hastelloy C are both high-performance nickel-based alloys that are known for their excellent corrosion resistance in a wide range of harsh environments. However, there are some key differences between the two materials. Hastelloy B is primarily composed of nickel, molybdenum, and chromium, while Hastelloy C contains additional elements such as tungsten and cobalt. This difference in composition gives Hastelloy C slightly higher strength and temperature resistance compared to Hastelloy B. Both alloys are commonly used in chemical processing, aerospace, and marine applications where corrosion resistance is critical.
Comparison
Attribute | Hastelloy B | Hastelloy C |
---|---|---|
Composition | Primarily composed of nickel, molybdenum, chromium, and iron | Contains nickel, molybdenum, chromium, and iron with additional elements such as tungsten and cobalt |
Corrosion Resistance | High resistance to corrosion in various environments | Excellent resistance to corrosion in oxidizing and reducing environments |
Temperature Resistance | Good resistance to high temperatures | Higher temperature resistance compared to Hastelloy B |
Applications | Used in chemical processing, aerospace, and marine industries | Commonly used in chemical processing, petrochemical, and pharmaceutical industries |
Further Detail
Composition
Hastelloy B and Hastelloy C are both nickel-based alloys that offer excellent corrosion resistance in a wide range of environments. However, they differ in their composition. Hastelloy B is primarily composed of nickel, molybdenum, and chromium, with small amounts of iron and tungsten. On the other hand, Hastelloy C contains nickel, molybdenum, and chromium as well, but with the addition of small amounts of iron and cobalt. This difference in composition gives each alloy unique properties that make them suitable for different applications.
Corrosion Resistance
Both Hastelloy B and Hastelloy C are known for their exceptional corrosion resistance, but they excel in different environments. Hastelloy B is particularly resistant to hydrochloric acid, sulfuric acid, and phosphoric acid, making it ideal for chemical processing applications. On the other hand, Hastelloy C offers superior resistance to oxidizing acids like nitric acid and chromic acid, as well as to chloride solutions. This makes it a preferred choice for applications in the chemical processing and petrochemical industries where exposure to harsh chemicals is common.
Temperature Resistance
When it comes to temperature resistance, both alloys can withstand high temperatures, but Hastelloy C has a higher temperature limit compared to Hastelloy B. Hastelloy B is suitable for use in temperatures up to 1300°F (704°C), while Hastelloy C can be used in temperatures up to 1900°F (1038°C). This higher temperature resistance of Hastelloy C makes it a better choice for applications where exposure to extreme heat is a concern, such as in aerospace and gas turbine components.
Strength and Toughness
While both alloys exhibit high strength and toughness, there are differences in their mechanical properties. Hastelloy B has a higher tensile strength and yield strength compared to Hastelloy C, making it a more suitable choice for applications that require high strength and resistance to mechanical stress. On the other hand, Hastelloy C offers better toughness and ductility, making it a preferred choice for applications that require good formability and weldability.
Cost
Cost is another factor to consider when choosing between Hastelloy B and Hastelloy C. Hastelloy C is generally more expensive than Hastelloy B due to its higher content of molybdenum and cobalt, which are more expensive metals compared to tungsten. This higher cost of Hastelloy C may influence the decision-making process, especially for applications where cost-effectiveness is a priority.
Applications
Due to their unique properties, Hastelloy B and Hastelloy C find applications in different industries. Hastelloy B is commonly used in chemical processing, pollution control, and pulp and paper industries where resistance to sulfuric acid and hydrochloric acid is crucial. On the other hand, Hastelloy C is preferred in applications such as chemical processing, aerospace, and gas turbine components where resistance to oxidizing acids and high temperatures is required.
Comparisons may contain inaccurate information about people, places, or facts. Please report any issues.