Hastelloy B chemical composition

Physical properties

Density: 9.24 g/cm3

Melting point: 1330-1380℃

Hastelloy B alloy has the following properties

1. Control the content of iron and chromium elements at the lowest level to prevent the formation of β-phase Ni4Mo.

2. Excellent corrosion resistance to reducing environments.

3. Excellent corrosion resistance to medium concentration sulfuric acid and many non-oxidizing acids.

4. Very good resistance to chloride ion reduction stress corrosion cracking (SCC).

5. Excellent resistance to corrosion by various organic acids.

Hastelloy B metallographic structure

Hastelloy B is a face-centered cubic lattice structure

By controlling the iron and chromium content to a minimum, the processing brittleness is reduced and the precipitation of the Ni4Mo phase between 700-870°C is prevented.

Hastelloy B corrosion resistance

Nickel-molybdenum alloy Hastelloy B has extremely low carbon and silicon content, which reduces the precipitation of carbon and other impurity phases in the welding heat-affected zone, so its welds also have sufficient corrosion resistance. Alloy Hastelloy B-2 has good corrosion resistance in reducing media, such as hydrochloric acid solutions of various temperatures and concentrations. It also has good corrosion resistance in moderately concentrated sulfuric acid solutions (or containing a certain amount of chloride ions). It can also be used in acetic acid and phosphoric acid environments. Alloy materials can have the best corrosion resistance only when they are in a suitable metallographic state and pure crystal structure.

Hastelloy B has good corrosion resistance to reducing environments such as moderate concentrations of sulfuric acid and other non-oxidizing acids, and good resistance to chloride ion stress corrosion cracking. However, it is extremely susceptible to corrosion in oxidizing environments and therefore cannot be used. In environments containing iron salts or copper salts, these substances can quickly cause corrosion.

Hastelloy B Application Scope Application areas:

Alloy Hastelloy B has wide applications in the fields of chemistry, petrochemicals, energy manufacturing and pollution control, especially in the sulfuric acid, hydrochloric acid, phosphoric acid, acetic acid and other industries.