Hastelloy B-2 Forging Bar ASTM B564 Nickel Alloy Round Bar Ø150
Hastelloy B-2 is a nickel-molybdenum alloy known for its exceptional resistance to reducing environments, such as hydrochloric acid and other non-oxidizing acids. It is a solid-solution-strengthened alloy with excellent corrosion resistance in harsh chemical environments, particularly those involving sulfuric, hydrochloric, and phosphoric acids. The ASTM B564 specification covers the requirements for nickel alloy forgings, including Hastelloy B-2, in the form of bars, rings, and other shapes.
Material Composition:
The chemical composition of Hastelloy B-2 typically includes:
Nickel (Ni): Balance (approximately 65-70%)
Molybdenum (Mo): 26-30%
Iron (Fe): 2.0% max
Chromium (Cr): 1.0% max
Cobalt (Co): 1.0% max
Manganese (Mn): 1.0% max
Silicon (Si): 0.10% max
Carbon (C): 0.02% max
Sulfur (S): 0.03% max
Phosphorus (P): 0.04% max
The low carbon content and absence of chromium in Hastelloy B-2 make it highly resistant to the formation of carbide precipitation during welding or exposure to high temperatures.
Key Properties:
- Excellent Corrosion Resistance:
Hastelloy B-2 is specifically designed to resist reducing environments, such as hydrochloric acid, sulfuric acid, and phosphoric acid.
It is highly resistant to pitting, crevice corrosion, and stress corrosion cracking (SCC) in chloride-containing environments.
Performs well in both acidic and alkaline media, particularly in non-oxidizing conditions.
Maintains its mechanical properties and corrosion resistance at elevated temperatures, up to approximately 400°C (750°F).
Hastelloy B-2 can be forged, machined, and welded using standard techniques, although it requires careful control of heat input during welding to avoid carbide precipitation.
- Low Magnetic Permeability:
The alloy is non-magnetic, making it suitable for applications where magnetic interference must be minimized.
- Resistance to Localized Corrosion:
The high molybdenum content provides excellent resistance to localized corrosion, such as pitting and crevice corrosion.
Applications:
Hastelloy B-2 is widely used in industries that require resistance to highly corrosive environments, including:
- Chemical Processing: For reactors, vessels, and piping systems handling hydrochloric acid, sulfuric acid, and other aggressive chemicals.
- Pharmaceutical Industry: In equipment exposed to corrosive media during drug manufacturing.
- Acid Production: For components in plants producing hydrochloric, sulfuric, and phosphoric acids.
- Pollution Control: In scrubbers and waste treatment systems.
- Oil and Gas Industry: For downhole and surface equipment exposed to sour gas environments.
Standards and Specifications:
- ASTM B564: Standard specification for nickel alloy forgings, including Hastelloy B-2, in the form of bars, rings, and other shapes.
- ASME SB564: Equivalent to ASTM B564, used for pressure vessel and boiler applications.
- UNS N10665: Unified Numbering System designation for Hastelloy B-2.
Advantages:
- Exceptional resistance to reducing acids, such as hydrochloric and sulfuric acids.
- Low susceptibility to stress corrosion cracking in chloride environments.
- Good mechanical properties at both room and elevated temperatures.
- Suitable for use in highly corrosive and high-purity applications.
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