Designated as UNS N10665 or W.Nr. 2.4617, Hastelloy B2 (also known as “Alloy B2”), is a solid solution strengthened nickel-molybdenum alloy with low addition of carbon, silicon & iron. It has good resistance to hydrogen chloride, sulfuric acid and phosphoric acids and has excellent resistance to stress corrosion cracking and pitting corrosion at elevated temperatures. The significantly low carbon content makes Hastelloy B2 less susceptible to decreased corrosion resistance in the weld zone, in the as-welded condition. It can be used in reducing chemical environments and chemical processing industry. However, Hastelloy B2 should not be used at temperatures between 1000°F and 1600°F nor be used in oxidizing media.

1. Chemical Composition Requirements

The Chemical Composition of Hastelloy B2, %
Ni	Balance
Mo	26.0-30.0
Fe	≤2.00
C	≤0.02
Co	≤1.00
Cr	≤1.00
Mn	≤1.00
Si	≤0.10
P	≤0.040
S	≤0.030

2. Typical Physical Properties

Properties	Value
Density Room Temp.	0.333lb/in3
Melting Range	2430°F to 2520°F
Specific Heat 68°F	0.090Btu/lb. °F
Elastic Modulus 68°F	31.4*106psi
Thermal Conductivity 68°F	64Btu/ft.h.°F

3. Product Forms and Standards of Hastelloy B2

Product Form	Standard
Bar	ASTM B335, B564
Sheet & Plate	ASTM B333, A480
Welded Pipe	ASTM B619, B775
Seamless Pipe & Tube	ASTM B622
Welded Tube	ASTM B626

*The mechanical properties of Hastelloy B2 vary in different forms or heat treatment conditions.

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