Alloy B-2 Data Sheet

GENERAL PROPERTIES

Alloy B2 is a nickel-molybdenum alloy with significant resistance to reducing environments, such as hydrogen chloride gas and sulphuric, acetic and phosphoric acids. Alloy B2 provides resistance to pure sulphuric acid and a number of non-oxidizing acids. The alloy should not be used in oxidizing media or where oxidizing contaminants are available in reducing media. Premature failure may occur if alloy B2 is used where iron or copper is present in a system containing hydrochloric acid.

Industry users like the resistance to a wide range of organic acids and the resistance to chloride-induced stress-corrosion cracking.

Alloy B2 resists the formation of grain boundary carbide precipitates in the weld heat-affected zone, making it suitable for most chemical process applications in the as-welded condition. The heat-affected weld zones have reduced precipitation of carbides and other phases to ensure uniform corrosion resistance.

RESISTANCE TO CORROSION

Alloy B2 also has excellent resistance to pitting and stress corrosion cracking.

The high molybdenum content in Alloy B2 gives the alloy excellent resistance to hydrochloric acid over a wide range of concentrations and temperatures.

PHYSICAL PROPERTIES

MECHANICAL PROPERTIES

CHEMICAL PROPERTIES 

WELDING

Alloy B2 resists the formation of grain boundary carbide precipitates in the weld heat-affected zone, making it suitable for most chemical process applications in the as-welded condition. The heat-affected weld zones have reduced precipitation of carbides and other phases to ensure uniform corrosion resistance.

HEAT TREATMENT

Alloy B2 can be solution treated at 1065°C (1950°F) and then rapidly quenched in normal conditions that require product forms to be furnished and used. In cases where bright annealed product forms such as sheet and strip are required, Alloy B2 can be solution treated at 1149°C (2100°F) and then cooled in a hydrogen atmosphere so as to avoid oxidation of the bright surface.