Microstructure
Alloy B-2 has a face-centered cubic (FCC) structure. Its carefully controlled chemistry, with minimal iron and chromium content, helps prevent embrittlement during fabrication by retarding the precipitation of Ni₄Mo phase in the 700–800°C temperature range.
Characteristics
Controlled chemistry with minimal iron and chromium to retard the formation of ordered β-phase (Ni₄Mo).
Superior corrosion resistance in strongly reducing environments.
Outstanding resistance to medium-concentrated sulfuric acid and other non-oxidizing acids.
Excellent resistance to chloride-induced stress-corrosion cracking (SCC).
Good resistance to a wide range of organic acids.
Corrosion Resistance
Extremely low carbon and silicon content minimizes carbide precipitation and phase formation in the heat-affected zone of welds, ensuring excellent welded corrosion resistance.
Hastelloy B-2 performs exceptionally well in reducing media, particularly in hydrochloric acid across a broad range of temperatures and concentrations.
It offers excellent resistance to medium-concentrated sulfuric acid, even in mildly chloride-contaminated environments.
Effective in acetic and phosphoric acids, making it versatile for chemical processing applications.
To achieve optimum corrosion resistance, the material must be in the correct metallurgical condition with a clean microstructure.
Applications
Alloy B-2 is widely used in the chemical processing industry, particularly for handling sulfuric, hydrochloric, phosphoric, and acetic acids. However, it should not be used in environments containing ferric or cupric salts, as they can cause rapid corrosion failure. These salts may form when hydrochloric acid comes into contact with iron or copper surfaces.
We have products:
ASTM B366 Alloy B / B-2 / B-3 Nickel Alloy 45 Degree Elbow; ASTM B564 Alloy B-3 / UNS N10675 Nickel Alloy Blind Flange; ASTM B366 Alloy B / B-2 Nickel Alloy Blind Flange; ASTM B366 Alloy B / UNS N10001 Nickel Alloy Concentric Reducer Fitting; PN20-PN420 ASTM A564 Alloy B-2 / B-3 Nickel Alloy Weld Neck Flange; ASTM B333 Alloy B-2 / UNS N10665 Nickel Alloy Steel Sheet / Plate; Nickel Alloy Steel Round Bar, ASTM B335 Alloy B-2 / B-3;