Overview

HASTELLOY B-2 alloy is a nickel-base wrought alloy with excellent resistance to hydrochloric acid at all concentrations and temperatures. It also withstands hydrogen chloride, sulfuric,acetic and phosphoric acids.

The alloy has excellent resistance to pitting, to stresscorrosion cracking and to knifeline and heat-affected zone attack. It resists the formation of grain-boundary carbide precipitates in the weld heataffected zone, thus making it suitable for most chemical process applications in the aswelded condition Hastelloy B2 is a nickel-molybdenum alloy with significant resistance to reducing environments, such as hydrogen chloride gas and sulfuric, acetic and phosphoric acids.

Limiting Chemical Composition, %

Nickel.......................................................................................................................................................................................Balance  

Molybdenum.....................................................................................................................................................................26.00--30.00

Iron.................................................................................................................................................................................................2.00

Chromium.......................................................................................................................................................................................1.00

Carbon............................................................................................................................................................................................0.02

Manganese.....................................................................................................................................................................................1.00

Silicon.............................................................................................................................................................................................1.00

Phosphorus....................................................................................................................................................................................0.04 

Sulphur............................................................................................................................................................................................0.03

Physical Constants

Below are some physical constants and thermal properties of

Mechanical properties

Tensile-properties

Corrosion Resistance

The high molybdenum content in alloy B-2 gives this alloy excellent resistance to hydrochloric acid over a wide range of concentrations and temperatures. Alloy B-2 also shows good resistance to hydrogen chloride, sulfuric acid and phosphoric acids and has excellent resistant to pitting and stress corrosion cracking in the heat affected zone. Uniform corrosion rates in various environments are similar compared to the other nickel-molybdenum alloys such as alloy B-3®. The presence of any oxidizing media, even in trace amounts, will significantly increase corrosion. Alloy B-2 should not be used in oxidizing media, as these alloys show little to no resistance in such environments.

Heat Treatment

Welding alloy B-2 can be performed by TIG, MIG and coated electrode. Dissimilar metal welding alloy B-2 to alloy B-3® is possible using AWS ERNiMo-10 for GTAW and GMAW operations and ENiMo-10 for SMAW welding. The work piece should be thoroughly cleaned with acetone or other suitable cleaners to ensure that all contaminants and markings are removed. Grinding prior to welding can be performed with a clean alumina wheel; not previously used on any iron-based materials. There is no need for pre or post heat treatment processes unless the work piece has been formed or welded. A full solution anneal before welding is required on pieces that have been formed. Hot working should be performed in a temperature range between 1700°F to 2250°F with heavy deformation performed toward the upper end of the range. Reheating of the work piece may be necessary. A full solution anneal should be performed on all hot-worked, welded and any cold-worked pieces with more than 15% deformation followed by a water quench. Solution annealing of alloy B-2 is performed at 1950°F for 30 minutes per inch thickness followed by a water quench. Subject material should be charged into a hot furnace and monitored closely for accurate time at temperature. Contact thermocouples are preferred.

Available Forms

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