Hastelloy B2 Alloy

Chemical Analysis
C Carbon
0.02 max
Mn Manganese
1.00 max
Si Silicon
0.10 max
Cr Chromium
1.00 max
S Sulfur
0.03 max
P Phosphorus
0.04 max
Co Cobalt
1.00 max
Fe Iron
2.00 max
Mo Molybdenum
26.00 – 30.00
Ni Nickel
balance

General characteristics of Hastelloy B2 Alloy

This is a nickel-molybdenum alloy that is particularly suited to handling reducing acids at high concentrations and temperatures. It may be used in the as-welded condition since it is not susceptible to grain-boundary carbide precipitation following welding. The alloy should not be used in the presence of oxidizing media.

Applications

This alloy finds its main uses in the chemical manufacturing industries, particularly in the production of acetic acid, herbicides, insecticides, ethylene glycol and ethyl benzene. It is also used in the production of high-octane gasoline.

Forging

The material should be heated to around 2250ÂşF (1230ÂşC) and held for a soak time. Forging may be carried out down to around 1600ÂşF (870ÂşC).

Heat treatment

The alloy should be solution annealed at 1950ÂşF (1040ÂşC) and rapidly quenched.

Machinability

The alloy work hardens rapidly. Machines should be rigid and powerful, and the tool and workpiece should be held rigid. Tools should be maintained sharp at all times.

Weldability

This alloy may be welded by the gas-metal-arc, gas-tungsten-arc and shielded-metal-arc processes. Parts may normally be used in the as-welded condition, but a post-weld anneal will result in optimum corrosion resistance.

It should be noted that Hastelloy B3 Alloy, at 0.01 C max, has a lower tendency to carbide precipitation than does Alloy B2.

 

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