Nickel Alloy UNS N10665 Hastelloy B2

Hastelloy B2 is a solid solution strengthened, nickel-molybdenum alloy, with significant resistance to reducing environments like hydrogen chloride gas, and sulfuric, acetic and phosphoric acids. Molybdenum is the primary alloying element which provides significant corrosion resistance to reducing environments. This nickel steel alloy can be used in the as-welded condition because it resists the formation of grain-boundary carbide precipitates in the weld heat-affected zone.

Chemical Composition (%) :

Physical Properties

Mechanical Properties (Minimum value at 20℃)

Corrosion Resistances

• Total corrosion, the performance characteristics of B2 alloy against hydrochloric acid, sulfuric acid, phosphoric acid and other inorganic acids are basically the same as Hastelloy B alloy. The corrosion resistance is generally better than that of Hastelloy B alloy, especially after welding. In 20% boiling hydrochloric acid, even if the B2 alloy is deformed by 50% in cold working, it does not affect its corrosion resistance.
• Intergranular corrosion, due to the low content of carbon, silicon and iron in Hastelloy B2 alloy, carbides and some intermetallic phases in sensitized steel are far less than Hastelloy B alloy, therefore, the resistance of this alloy to intergranular corrosion better.
• Stress corrosion, the test shows that when the residual Fe≤2% and Cr≤1.0% in the Hastelloy B2 alloy is too low compared with the same alloy with proper control of the amount of iron and chromium. Better than the former.

Hastelloy Alloy B2 Characteristic

• Control iron and chromium elements in low content, prevent the formation of β phase Ni4Mo.
• Excellent corrosion resistance to reducing environments.
• Good resistance to medium concentration sulfuric acid and many non – oxidizing acids.
• Excellent resistance to chloride ion reduction stress corrosion cracking (SCC).
• Excellent resistance to organic acid corrosion.

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