Hastelloy® B-2
Hastelloy B-2 is a solid solution strengthened, nickel-molybdenum alloy. It is engineered specifically for significant resistance to reducing environments like hydrogen chloride gas, and sulfuric, acetic, and phosphoric acids. It is the premier choice for handling pure hydrochloric acid (HCl).
- Common Forms: Plate, Sheet, Bar, Pipe, Fittings.
- Key Feature: Resistant to Hydrochloric Acid at all concentrations and temperatures.
- Limitation: Poor corrosion resistance in oxidizing environments.
- Structure: Low carbon and silicon to prevent grain-boundary precipitation.
If your process involves pure Hydrochloric Acid (HCl), Hastelloy B-2 is the superior choice. Unlike the C-series alloys, B-2 relies on a high Molybdenum content (~28%) to withstand aggressive reducing acids. It effectively resists the formation of grain-boundary carbide precipitates in the weld heat-affected zone, making it suitable for use in the as-welded condition.
Hydrochloric Acid Specialist
Excellent resistance to HCl gas and acid at all concentrations and temperatures, a capability matched by very few metals (like Tantalum).
Reducing Environments
Superior performance in pure sulfuric acid, acetic acid, and phosphoric acid where oxidizing contaminants are absent.
SCC Resistance
Like other high-nickel alloys, it offers excellent resistance to chloride-induced stress corrosion cracking (SCC).
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 65.0 min (Balance) |
| Molybdenum (Mo) | 26.0 - 30.0 |
| Iron (Fe) | 2.0 max |
| Chromium (Cr) | 1.0 max |
| Manganese (Mn) | 1.0 max |
| Carbon (C) | 0.02 max |
*Note: The extremely high Molybdenum content drives its reducing acid resistance.
| Product Form | ASTM / ASME Standards |
|---|---|
| Plate, Sheet, Strip | ASTM B333, ASME SB333 |
| Bar & Rod | ASTM B335, ASME SB335 |
| Pipe (Seamless & Welded) | ASTM B619, ASTM B622, ASME SB619/SB622 |
| Fittings | ASTM B366, ASME SB366 |
| Forgings | ASTM B564, ASME SB564 |
| Property | Typical Values (Room Temp) |
|---|---|
| Tensile Strength | 110 - 130 ksi (760 - 895 MPa) |
| Yield Strength (0.2% Offset) | 50 - 65 ksi (345 - 450 MPa) |
| Elongation | 40 - 60 % |
| Hardness (Rockwell B) | 85 - 100 HRB |
HCl Production
Equipment for the production and handling of hydrochloric acid.
Chemical Synthesis
Reactors for alkylation of ethylbenzene and production of acetic acid.
Pesticide Manufacturing
Handling reducing acid catalysts in the synthesis of agrochemicals.
Pharmaceuticals
Processes involving reducing environments where C-series alloys may corrode.
Need Hastelloy B-2 for Reducing Acids?
We supply high-quality Hastelloy B-2 bar, plate, and pipe. Contact our metallurgists to ensure this alloy is right for your specific chemical environment.
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