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.
