Designated as UNS N10675 or W.Nr. 2.4600, Hastelloy B3 (also known as “Alloy B3”), is a nickel-molybdenum alloy with the addition of chromium, iron and other elements. It has excellent resistance to hydrochloric acid at all concentrations and temperatures. It also has good performance in sulfuric, acetic, formic and phosphoric acids, and other non-oxidizing media. Alloy B3 has excellent resistance to pitting corrosion, stress-corrosion cracking and to knife-line and heat-affected zone attack. Compared to Hastelloy B2, Hastelloy B3 has more superior thermal stability. It’s widely used in chemical processes, vacuum furnaces, and piping components in reducing environments.

1. Chemical Composition Requirements

The Chemical Compostition of Hastelloy B3, %
Nickel	≥65
Molybdenum	28.5
Chromium	1.5
Iron	1.5
Tungsten	≤3
Manganese	≤3
Cobalt	≤3
Aluminum	≤0.5
Titanium	≤0.2
Silicon	≤0.1
Carbon	≤0.01
Niobium	≤0.2
Vanadium	≤0.2
Copper	≤0.2
Tantalum	≤0.2
Zirconium	≤0.01

2. Typical Physical Properties

Density		Thermal Conductivity		Specific Heat		Melting Range
lb/in3	g/cm3	Btu.in/h.ft2.°F	W/m.°C	Btu/lb.°F	J/kg*°C	°F	°C
0.333	9.22	78	11.2	0.089	373	2500-2585	1370-1418

3. Product Forms and Standards of Hastelloy B3

Product Form	Standard
Sheet, Plate & Strip	ASTM B333
Billet, Rod & Bar	ASTM B335, B472
Coated Electrodes	DIN 2.4696
Bare Welding Rods & Wire	DIN 2.4695
Seamless Pipe & Tube	ASTM B622
Welded Pipe & Tube	ASTM B619, B626
Fittings	ASTM B366, B462
Forgings	ASTM B564, B462

*The mechanical properties of Alloy B3 vary in different forms or heat treatment conditions.

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