General Description

Hastelloy B2 is nickel-molybdenum alloy with lower carbon compared with Hastelloy B, which exhibits superior resistance to hydrochloric acid, aluminum chloride catalysts, and other strongly reducing chemicals.

Hastelloy B2 is suitable for most chemical process applications in the as-welded condition. Well suited for equipment handling hydrochloric acid in all concentrations and temperatures. Resistant to hydrogen chloride gas and sulfuric, acetic, and phosphoric acids. Principal high-temperature uses are those in which a low coefficient of thermal expansion is required.

Exposure to temperatures of 540 to 815 °C (1000–1500 °F) should be avoided because of a reduction in the ductility of the alloy. In oxidizing gases such as air, Hastelloy B2 produced by NiWire can be used at temperatures up to 540 °C (1000 °F). In reducing gases or in vacuum, the alloy can be used from 815 °C (1500 °F) to substantially higher temperatures. Ferric or cupric salts might develop when hydrochloric acid comes in contact with iron or copper, so Hastelloy B2 should not be used with copper or iron piping in a system containing hydrochloric acid.

Chemical Composition

Grade C% P% S% Mn% Si% Cr% Mo% Co% Ni% Fe%
Hastelloy B2 Max 0.02 Max 0.04 Max 0.03 Max 1.0 Max 0.10 Max 1.0 26.0-30.0 Max 1.0 Bal. Max 2.0


UNS N10665

Werkstoff Nr. 2.4617


Hastelloy B2 Bar: ASTM B335

Hastelloy B2 Forgings: ASTM B564

Hastelloy B2 Welded Tube: ASTM B626

Hastelloy B2 Seamless Tube: ASTM B622

Hastelloy B2 Sheet/Plate: ASTM B333

Physical Properties

Density:9.2 g/cm3

Melting Point: 1330°C-1380°C

Mechanical Properties

Solution Annealed

Tensile: Min 745 MPa

Yiled: Min 325 MPa

Elongation: Min 40%

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