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Hastelloy B3

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.

Hastelloy B3 flanged fittings with bolts and nuts

Hastelloy B3 flanged fittings with bolts and nuts for reducing-acid equipment.

1. Chemical Composition Requirements

The Chemical Compostition of Hastelloy B3, %
Nickel≥65
Molybdenum28.5
Chromium1.5
Iron1.5
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

DensityThermal ConductivitySpecific HeatMelting Range
lb/in3g/cm3Btu.in/h.ft2.°FW/m.°CBtu/lb.°FJ/kg*°C°F°C
0.3339.227811.20.0893732500-25851370-1418

3. Product Forms and Standards of Hastelloy B3

Product FormStandard
Sheet, Plate & StripASTM B333
Billet, Rod & BarASTM B335, B472
Coated ElectrodesDIN 2.4696
Bare Welding Rods & WireDIN 2.4695
Seamless Pipe & TubeASTM B622
Welded Pipe & TubeASTM B619, B626
FittingsASTM B366, B462
ForgingsASTM B564, B462
*The mechanical properties of Alloy B3 vary in different forms or heat treatment conditions.

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    Hebei Metals Industrial Limited
    (Shijiazhuang Metalsin Pipeline Tech Co., Ltd)
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