Hastelloy alloy B2 vs B3
Hastelloy b2 vs b3: Nickel Hastelloy B2 and B3 are both highly corrosion-resistant nickel-molybdenum alloys, but they differ in their chemical compositions and applications. Our suppliers can provide Hastelloy B2 pipe and Hastelloy B3 pipe. Contact us to get more information and quotation for free!
Here's a detailed comparison between the two:
1. Chemical Composition:
Hastelloy B2 UNS N10665:
Nickel (Ni): 65%
Molybdenum (Mo): 28-32%
Iron (Fe): 2%
Chromium (Cr): 1%
Other Elements: Small amounts of tungsten, cobalt, manganese, silicon, carbon, sulfur, and phosphorus.
Hastelloy B3 UNS N10675:
Nickel (Ni): 65%
Molybdenum (Mo): 28.5%
Iron (Fe): 1.5%
Chromium (Cr): 1%
Other Elements: Small amounts of cobalt, manganese, silicon, carbon, sulfur, and phosphorus.
2. Corrosion Resistance:
Both alloy B2 and B3 offer excellent resistance to a wide range of corrosive environments, including acids, alkalis, and chloride-induced stress corrosion cracking (SCC).
Hastelloy Alloy B3, however, has enhanced resistance to hydrochloric acid at all concentrations and temperatures compared to B2.
3. Hastelloy b2 vs b3 in Applications:
Hastelloy B2 2.4617:
Primarily used in chemical processing, especially in environments containing sulfuric, phosphoric, hydrochloric, and hydrofluoric acids. Suitable for use in reducing environments.
Hastelloy B3 2.4600:
Preferred for applications involving hydrochloric acid processing due to its superior resistance to this acid. Also used in environments containing sulfuric, phosphoric, acetic acids, and other strong acids. Particularly beneficial in situations where reducing and oxidizing acids are present simultaneously. Meanwhile, Hastelloy B3 is a better choice for highly oxidizing environments, such as nitric and hydrochloric acid mixtures, due to its greater resistance to pitting and crevice corrosion.
4. Mechanical Properties:
Both alloys exhibit high strength and excellent fabricability. B3 typically offers slightly improved mechanical properties compared to B2, including higher tensile strength and yield strength.
5. Weldability:
2.4617 Hastelloy B2 and 2.4600 Hastelloy B3 are both readily weldable using conventional welding techniques. However, B3 may offer better weldability due to its slightly lower carbon content, which reduces the risk of sensitization and subsequent corrosion in the heat-affected zone.
6. Cost:
The cost difference between Hastelloy B2 and B3 is typically minimal, with variations depending on factors such as market demand and availability.
In summary, while both Hastelloy B2 and B3 are highly corrosion-resistant alloys suitable for a wide range of applications, Hastelloy B3 offers enhanced resistance to hydrochloric acid, making it particularly advantageous in environments where this acid is prevalent. However, the choice between the two alloys ultimately depends on the specific requirements of the application and the corrosive environment in which they will be used.
