Hastelloy B-2 Nickel Based Superalloy

Hastelloy B-2 is a solid solution strengthened nickel-molybdenum alloy, which has significant resistance to reducing environments such as hydrogen chloride gas, sulfuric acid, acetic acid and phosphoric acid. Molybdenum is the main alloying element and can provide significant corrosion resistance for reducing environments. This nickel steel alloy can be used in the welding state because it can resist the formation of grain boundary carbide precipitation in the welding heat-affected zone. This nickel alloy provides excellent resistance to hydrochloric acid at various concentrations and temperatures. In addition, Hastelloy B-2 has excellent resistance to pitting corrosion, stress corrosion cracking, and knife line and heat-affected zone attacks. Hastelloy B-2 provides resistance to pure sulfuric acid and many non-oxidizing acids.

Hastelloy B-2 alloy has poor corrosion resistance to oxidizing environments, so it is not recommended for use in oxidizing media or the presence of iron or copper salts, because they may cause rapid premature corrosion failure. These salts may occur when hydrochloric acid comes into contact with iron and copper. Therefore, if the alloy is used with iron or copper pipes in a system containing hydrochloric acid, the presence of these salts may cause the alloy to fail prematurely. In addition, due to the reduced ductility of the alloy, this nickel steel alloy should not be used at temperatures between 1000°F and 1600°F.

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